RSC主编推荐:有机领域精彩文章快览(免费阅读原文)

英国皇家化学会(RSC)是一个超过175年历史的面向全球化学家的非营利会员制机构,旗下拥有44种期刊,其中很多在化学领域有很高影响力。为了进一步帮助广大读者追踪科技前沿热点,X-MOL团队与英国皇家化学会合作,推出英国皇家化学会期刊主编推荐的精彩文章快览,本期文章属“有机领域”,英文点评来自英国皇家化学会期刊的主编。如果大家对我们的解读有更多的补充和点评,欢迎在文末写评论发表您的高见!Chemical Science (IF: 9.556)1. Synthesis of ethanol from aryl methyl ether/lignin, CO2 and H2Chem. Sci., 2019, Advance ArticleDOI: 10.1039/C9SC03386FResearchers in China have developed a method to synthesise ethanol from CO2 and H2 and lignin, or aryl methyl ethers derived from lignin. The turnover number of ethanol was as high as 135 and ethanol was the only liquid product. This provides a new strategy to produce ethanol, which is a very important chemical, from renewable resources.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Reaction mechanism, norbornene and ligand effects, and origins of meta-selectivity of Pd/norbornene-catalyzed C–H activationChem. Sci., 2019, Advance ArticleDOI: 10.1039/C9SC04720DScientists at Jiaotong University in China and Masahiro Ehara have investigated the detailed mechanism, selectivity and norbornene and ligand effects in a Pd/norbornene-catalysed meta-selective C–H activation and alkylation reaction. Although this reaction has been well used, the mechanism of the reaction is not clear. Here the authors present a thereotical study to deepen the understanding of this reaction, which will be very useful for experimental chemists.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文Organic Chemistry Frontiers(IF: 5.076)1. Oxidant-controlled divergent transformations of 3-aminoindazoles for the synthesis of pyrimido[1,2-b]-indazoles and aromatic nitrile-derived dithioacetalsOrg. Chem. Front., 2019, 6, 3355-3359DOI: 10.1039/C9QO00847KThe oxidant-controlled divergent reactivity of 3-aminoindazoles is presented herein. Diverse functionalized pyrimido[1,2-b]-indazole derivatives were obtained with good yields via a Lewis-acid promoted [3 + 3] annulation reaction between ketene dithioacetals and 3-aminoindazoles. When the reaction was performed using the Cu/[O] catalytic system, new reactivity for the ring-opening of 3-aminoindazoles via C–N bond activation was achieved, which enables the olefinic C–H arylation of ketene dithioacetals under mild conditions.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Synthetic approach to skeletally diverse nitrogen heterocycles from dicyano-2-methylenebut-3-enoatesOrg. Chem. Front., 2019, 6, 3321-3326DOI: 10.1039/C9QO00509AThe [2 + 1], formal-[4 + 1] and [5 + 1] annulations of electron-deficient dienes with ambiphilic nitrogen reagents were developed on the basis of a similar vinylogous aza-Michael addition. These synthetic approaches enable the divergent synthesis of several interesting heterocyclic skeletons, such as vinylaziridines, pyrroline and 2-aminopyridines, from easily accessible starting materials under mild conditions.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文Chemical Communications(IF: 6.164)1. Catalytic selective mono- and difluoroalkylation using fluorinated silyl enol ethersChem. Commun., 2019, Advance ArticleDOI: 10.1039/C9CC07677HThe judicious incorporation of a fluoroalkyl moiety often brings about beneficial effects on the properties of bioactive molecules. Consequently, efficient methods for selective fluoroalkylation are much sought after in drug discovery. Despite significant achievements in trifluoromethylation, selective mono- and difluoroalkylation is still undeveloped. Catalytic functionalization of fluorinated silyl enol ethers (FSEEs) emerges as a fruitful approach for the diversity-oriented synthesis of value-added α-mono or difluoroalkylated ketones. In this feature article, we detail our efforts in developing catalytic selective mono- and difluoroalkylation reactions using FSEEs. Specifically, we highlight our findings such as activating FSEEs by amines for catalytic enantioselective synthesis, taking advantage of the often observed high activity of FSEEs over the non-fluorinated analogues for reaction development, and the influence of C-F‧‧‧H-X interactions on reactivity and selectivity.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文

来源: X-MOL 2019-11-07

RSC主编推荐:能源领域精彩文章快览(免费阅读原文)

英国皇家化学会(RSC)是一个超过175年历史的面向全球化学家的非营利会员制机构,旗下拥有44种期刊,其中很多在化学领域有很高影响力。为了进一步帮助广大读者追踪科技前沿热点,X-MOL团队与英国皇家化学会合作,推出英国皇家化学会期刊主编推荐的精彩文章快览,本期文章属“能源领域”,英文点评来自英国皇家化学会期刊的主编。如果大家对我们的解读有更多的补充和点评,欢迎在文末写评论发表您的高见!Chemical Science (IF: 9.556)1. Activating the surface and bulk of hematite photoanodes to improve solar water splittingChem. Sci., 2019, Advance Article DOI: 10.1039/C9SC04110AA team of scientists from UNIST, Korea, propose a simple electrochemical activation treatment to improve the photoelectrochemical performance of Nb, Sn co-doped hematite nanorods. The activation process involves an initial thrice cathodic scanning (reduction) and a subsequent thrice anodic scanning (oxidation) to modify the surface and bulk properties of the Nb,Sn:Fe2O3 photoanode. The photocurrent density is increased by 62.3% from 1.88 to 3.05 mA/cm2 at 1.23 VRHE.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Molecular tunability of surface-functionalized metal nanocrystals for selective electrochemical CO2 reductionChem. Sci., 2019, Advance Article DOI: 10.1039/C9SC04439FResearchers from Switzerland demonstrate that a molecular chemistry approach can be used to develop efficient and selective heterogeneous catalysts in the electrochemical CO2 reduction reaction. They make imidazolium ligands to promote the CO2RR at the surface of hybrid organic/inorganic electrode materials. They use silver nanocrystals for the inorganic component to gain insights into the tuning of the surface chemistry offered by these ligands. Modifying the electronic properties of the metal surface was crucial to obtaining the high selectivities that were achieved.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文Energy & Environmental Science (IF: 33.25)1. A paradigm of storage batteries Energy Environ. Sci., 2019, Advance Article DOI: 10.1039/C9EE02356AIn this review article, the five dimensions of storage battery research are described from a chemical reaction point of view, where electrode materials and ion charge carriers represent the reactants, electrolytes provide the medium for the reaction, battery operation principles describe the configurations of the reactors, and electrode–ion chemical bonding reveals the nature of the reaction. Design of storage batteries entails a panoramic view with these five dimensions holistically considered. A deeper understanding of the chemical reaction nature of batteries will be an advantage that unifies rather than compartmentalizes a paradigm of storage battery research.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Intramolecular electronic coupling in porous iron cobalt (oxy)phosphide nanoboxes enhances the electrocatalytic activity for oxygen evolutionEnergy Environ. Sci., 2019, Advance Article DOI: 10.1039/C9EE02787DIn this work, a self-templating strategy is developed to construct porous iron cobalt (oxy)phosphide (Fe–Co–P) nanoboxes as promising pre-catalysts for the oxygen evolution reaction in alkaline solution. The constructed Fe–Co–P nanoboxes exhibit excellent electrocatalytic activity and afford a current density of 10 mA cm-2 at a small overpotential of 269 mV.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文Sustainable Energy & Fuels (IF 4.912)1. Cerium and nitrogen doped CoP nanorod arrays for hydrogen evolution in all pH conditionsSustainable Energy Fuels, 2019, Advance ArticleDOI: 10.1039/C9SE00588AThis work reports the results of doping a CoP nanorod array host catalyst with cerium and nitrogen with the aim to produce efficient nonprecious-metal based catalysts for hydrogen evolution in all pH conditions. The electrocatalytic measurements proved that Ce and N co-doping endows CoP with remarkably improved intrinsic catalytic activity and kinetics, affording a current of 10 mA cm-2 at the low overpotentials of 66 mV, 72 mV, and 41 mV in 0.5 M H2SO4, 1 M phosphate buffer, and 1 M KOH, respectively.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Micropores-in-macroporous gel polymer electrolytes for alkali metal batteriesSustainable Energy Fuels, 2019, Advance ArticleDOI: 10.1039/C9SE00690GIn this work, furan and pyrrole monomers have been in situ hyper-cross-linked within the macropores of a flexible poly(vinylidene-fluoride-co-hexafluoropropylene) polymer and a gel-polymer electrolyte (GPE) was prepared by impregnation with lithium or sodium liquid electrolytes. The prepared GPEs feature (i) high ionic conductivities rivaling those of liquid electrolytes, (ii) an excellent retention of electrolyte and fast transport of Li+ or Na+ ions, (iii) a flat charge/discharge plateau, indicating no side-reaction in the operating potential window of liquid electrolytes, (iv) a low and stable overpotential over extended cycles, indicating a high ionic conductivity and stability of the SEI layers, and (v) no evidence of any short-circuiting, implying the suppression of dendrite growth.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文

来源: X-MOL 2019-10-31

RSC主编推荐:材料领域精彩文章快览(免费阅读原文)

英国皇家化学会(RSC)是一个超过175年历史的面向全球化学家的非营利会员制机构,旗下拥有44种期刊,其中很多在化学领域有很高影响力。为了进一步帮助广大读者追踪科技前沿热点,X-MOL团队与英国皇家化学会合作,推出英国皇家化学会期刊主编推荐的精彩文章快览,本期文章属“材料领域”,英文点评来自英国皇家化学会期刊的主编。如果大家对我们的解读有更多的补充和点评,欢迎在文末写评论发表您的高见!Chemical Science (IF: 9.556)1. Synergistic catalysis on Fe–Nx sites and Fe nanoparticles for efficient synthesis of quinolines and quinazolinones via oxidative coupling of amines and aldehydesChem. Sci., 2019, Advance ArticleDOI: 10.1039/C9SC04060AResearchers in China have developed an iron nanocomposite as a reusable heterogeneous catalyst for synthesis of quinolines and quinazolinones via oxidative coupling of amines and aldehydes using H2O2 as the oxidant in aqueous solution under mild conditions. The nanocomposite operates through a synergistic effect between metallic Fe–Fe3C nanoparticles and Fe–Nx sites on N-doped porous carbon.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Two-dimensional magnetic metal–organic frameworks with the Shastry-Sutherland latticeChem. Sci., 2019, Advance Article DOI: 10.1039/C9SC03816GA multinational team of scientists from China, Germany and the USA have investigated a series of 2D MOFs with the Shastry-Sutherland lattice. The first-principles DFT calculation and Monte Carlo simulations show the first ferromagnetic 2D MOF with the Shastry-Sutherland lattice as well as finding that the materials are either stripe-order antiferromagnetic, magnetic-dimerized or nonmagnetic. The MOFs are semiconductors with band gaps ranging from 0.12 eV to 0.85 eV.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文Materials Horizons (IF: 14.356)1. Self-doped p–n junctions in two-dimensional In2X3 van der Waals materialsMater. Horiz., 2019, Advance Article DOI: 10.1039/C9MH01109AChallenges faced by atomically thin p–n junctions largely impede their development. On one hand, conventional processes to realize p- and n-type regions in three-dimensional crystals, such as implantation and doping, become invalid for two-dimensional crystals. On the other hand, the quality of the electrical contacts between two-dimensional semiconductors and metal electrodes is often masked by the high Schottky barrier at the hybrid interface. There is thus a pressing need to search for effective strategies to obtain p–n junctions and realize their low-resistive contacts with metal electrodes. We present here a novel strategy to realize p–n junctions in two-dimensional materials via self-doping. By stacking triple-layer In2X3 (X = S, Se), or sandwiching single-layer and double-layer In2S3 in-between graphene layers, atomically thin p–n junctions form naturally via self-doping without any additional modulation involved, which is attributed to the asymmetric structure-induced dipole field. More interestingly, the outmost layers in all these systems become metallic due to the self-doping, achieving natural low-resistance contact. These extraordinary features would largely simplify the device fabrication process and optimize the performances of two-dimensional electronic devices. 限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Recent advances in manipulation of micro- and nano-objects with magnetic fields at small scalesMater. Horiz., 2019, Advance Article DOI: 10.1039/C9MH00714HManipulation of micro- and nano-objects has been widely studied in the past two decades due to its potential applications in various fields. In this review, we focus primarily on magnetic field-based manipulation techniques, which have shown to be extremely promising for the motion control of such objects at small scales. We start from the fundamental analysis of the magnetic forces and the torques acting on objects subjected to magnetic fields, and then summarize the most recent contributions in magnetic manipulation employed in four typical applications: micro-mixing, trapping, colloidal assembly, and object transport. Moreover, how magnetic fields can be applied to object manipulation and the physical principles underlying these manipulation processes are highlighted.  限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文3. A centimeter scale self-standing two-dimensional ultra-thin mesoporous platinum nanosheetMater. Horiz., 2019, Advance Article DOI: 10.1039/C9MH01142KWe report unprecedented synthesis of centimeter scale self-standing mesoporous Pt nanosheets due to the micelle self-assembly of poly(styrene-b-2-vinyl pyridine-b-ethylene oxide) (PS-P2VP-PEO) in a well-ordered and monolayered fashion over the entire surface of the substrate. Although mesoporous metallic materials have been extensively studied, we have failed to synthesize self-standing ultra-thin mesoporous metal films. This manuscript demonstrates the first example of a ultra-thin mesoporous metal film, which is a big breakthrough in the mesoporous community as well as materials science community. The surface coverage and the ordering of the micelles can be controlled by the micelle concentration in the starting precursor solution. A two-step reduction method using both DMAB vapor (for nucleation) and AA (for further growth) enables complete Pt deposition and determines the preparation of continuously ordered mesoporous nanosheets. Such 2D mesoporous metallic nanosheets with an ultra-thin thickness of ca. 15 nm can be used as building blocks to construct flexible self-standing electrodes containing regulated nanochannels and interconnected networks. Due to several unique porous structural features, including abundant active sites, high surface area, and long-range-ordered pores orthogonal and continuous throughout the thickness, such a material is expected to deliver high performance in a wide range of electrochemical applications.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文Biomaterials Science (IF: 5.251)1. Melanin-loaded biocompatible photosensitive nanoparticles for controlled drug release in combined photothermal-chemotherapy guided by photoacoustic/ultrasound dual-modality imagingBiomater. Sci., 2019, 7, 4060-4074DOI: 10.1039/C9BM01052AIn this paper authors have developed a new type of multi-functional biocompatible nanoparticle, loaded with melanin, using multistep emulsification. The nanoparticles have combined photoacoustic and ultrasound dual modality imaging capabilities and the authors were able to trigger the release of paclitaxel using optical droplet vaporisation, there by controlling the drug release. The authors tested the nanoparticles both in vitro and in vivo and found the combined photothermal-chemotherapy effects were strongly synergistic, enhancing tumour ablation with no side effects.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文

来源: X-MOL 2019-10-17

RSC主编推荐:有机领域精彩文章快览(免费阅读原文)

英国皇家化学会(RSC)是一个超过175年历史的面向全球化学家的非营利会员制机构,旗下拥有44种期刊,其中很多在化学领域有很高影响力。为了进一步帮助广大读者追踪科技前沿热点,X-MOL团队与英国皇家化学会合作,推出英国皇家化学会期刊主编推荐的精彩文章快览,本期文章属“有机领域”,英文点评来自英国皇家化学会期刊的主编。如果大家对我们的解读有更多的补充和点评,欢迎在文末写评论发表您的高见!Chemical Science (IF: 9.556)1. Enantioselective carbene insertion into the N–H bond of benzophenone imineChem. Sci., 2019, Advance ArticleDOI: 10.1039/C9SC03354HResearchers from Sichuan University here present the efficient enantioselective insertion of α-diazoesters into the N–H bond of N-sp2-hybridized benzophenone imine using Rh2(esp)2 and chiral quanidine cooperative catalysis, obtaining substituted α-amino esters in high yields with good enantioselectivities.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Nickel-catalyzed hydroalkylation and hydroalkenylation of 1,3-dienes with hydrazonesChem. Sci., 2019, Advance ArticleDOI: 10.1039/C9SC04177JResearchers from Nankai University have reported a protocol for nickel-catalyzed hydroalkylation of dienes with hydrazones, which serve as equivalents of alkyl carbon nucleophiles. In addition, they demonstrate a protocol for hydroalkenylation of dienes with α,β-unsaturated hydrazones, providing a new method for the synthesis of 1,4-dienes. Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文Organic Chemistry Frontiers (IF: 5.076)1. Asymmetric domino 1,6-addition/annulation reaction of 3-cyano-4-alkenyl-2H-chromen-2-ones with isatin-derived MBH carbonates: enantioselective synthesis of 3,3'-cyclopentenylspirooxindoles bearing 2H-chromen-2-ones Org. Chem. Front., 2019, 6, 3342-3347DOI: 10.1039/C9QO00890JAn asymmetric domino 1,6-addition/annulation reaction of 3-cyano-4-alkenyl-2H-chromen-2-ones with isatin-derived MBH carbonates was achieved. With this developed protocol, a series of 3,3′-cyclopentenylspirooxindoles bearing 2H-chromen-2-ones were obtained in moderate to excellent yields with good to excellent diastereo- and enantioselectivities (>20 : 1 dr, up to 97 : 3 er).限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Highly convergent modular access to poly-carbon substituted cyclopropanes via Cu(I)-catalyzed three-component cyclopropene carboallylationOrg. Chem. Front., 2019, 6, 3387-3391DOI: 10.1039/C9QO00902GWe report herein the first example of conjunctive C–C cross-coupling of cyclopropenes enabled by a Cu-catalyzed three-component reaction of organoboron, cyclopropene and allylic bromide, which features a modular, stereoselective assembly of poly-carbon substituted cyclopropanes. Preliminary studies showed that the reaction can be extended to benzylation and made enantioselective with C2-symmetrical bisphosphine ligands.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文

来源: X-MOL 2019-10-10

RSC主编推荐:能源领域精彩文章快览(免费阅读原文)

英国皇家化学会(RSC)是一个超过175年历史的面向全球化学家的非营利会员制机构,旗下拥有44种期刊,其中很多在化学领域有很高影响力。为了进一步帮助广大读者追踪科技前沿热点,X-MOL团队与英国皇家化学会合作,推出英国皇家化学会期刊主编推荐的精彩文章快览,本期文章属“能源领域”,英文点评来自英国皇家化学会期刊的主编。如果大家对我们的解读有更多的补充和点评,欢迎在文末写评论发表您的高见!Chemical Science (IF: 9.556)1. A fluorinated alloy-type interfacial layer enabled by metal fluoride nanoparticle modification for stabilizing Li metal anodesChem. Sci., 2019, Advance Article DOI: 10.1039/C9SC01845JResearchers from the University of Science and Technology of China have reported a fluorinated alloy-type interfacial layer that can enhance the performance of lithium metal anodes and inhibit the growth of undesirable lithium dendrites for applications in lithium metal batteries. The layer is fabricated on the surface of a lithium metal anode by ex situ chemical modification using highly dispersible metal fluoride nanoparticles.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文2. An exceptionally stable octacobalt-cluster-based metal–organic framework for enhanced water oxidation catalysisChem. Sci., 2019, Advance Article DOI: 10.1039/C9SC03224JA team of scientists at Sun Yat-Sen University in China have developed a metal–organic framework with high stability, durability and catalytic activity for water oxidation. The catalyst is electrically driven with an overpotential of 430 mV at 10 mA cm−2and photodriven with a turnover frequency of 16 s-1 and 12 000 cycles, making it the best catalyst for water oxidation reported to date.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文Energy & Environmental Science (IF: 33.25)1. 3D Printing of highly textured bulk thermoelectric materials: mechanically robust BiSbTe alloys with superior performanceEnergy Environ. Sci., 2019, Advance Article DOI: 10.1039/C9EE02044FIn this work, p-type BiSbTe bulk materials with a strong preferential orientation were prepared by selective laser melting (SLM) technology combined with thermal explosion. The material attained the peak ZT value of 1.1 at 316 K in the building direction (BD), which is a 65% higher value than measured perpendicular to the BD, and even slightly larger than the maximum figure of merit ZT of the zone-melted (ZM) material.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文2. A multi-objective optimization-based layer-by-layer blade-coating approach for organic solar cells: rational control of vertical stratification for high performanceEnergy Environ. Sci., 2019, Advance Article DOI: 10.1039/C9EE02295CIn this study, the bulk heterojunction (BHJ) and layer-by-layer (LbL) processing strategies are compared via the doctor-blade coating technology because it is a roll-to-roll compatible high-throughput thin film fabrication route. The study of multiple target parameters demonstrates that the LbL blade-coating approach is a promising strategy to effectively reduce the efficiency-stability gap of organic solar cells and even a superior alternative to the BHJ method in commercial applications. 限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文Sustainable Energy & Fuels (IF 4.912)1. Operation of proton exchange membrane (PEM) fuel cells using natural cellulose fiber membranesSustainable Energy Fuels, 2019, Advance ArticleDOI: 10.1039/C9SE00381AThis work details the preparation, characterisation and operation of proton exchange membrane fuel cells (PEMFCs) primarily composed of cellulose by simply using 1.5-micron cellulose filter paper and impregnating it with a 10% Nafion solution or immersing the paper in RDP liquid. The membrane electrode assemblies (MEAs) incorporating the as-prepared membranes exhibit a maximum output power of 23 mW cm−2 at 80°C for the cellulose/Nafion membrane or 10 mW cm−2 at 60°C for the cellulose/RDP membrane with only 0.1 mg cm−2 Pt loading on the anode and cathode, when operated in air.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Hybridizing amorphous NiOx nanoflakes and Mn-doped Ni2P nanosheet arrays for enhanced overall water electrocatalysisSustainable Energy Fuels, 2019, Advance ArticleDOI: 10.1039/C9SE00396GIn this study, a series of hierarchical core–shell hybrid nanostructured bifunctional electrocatalysts have been successfully synthesized by electrodepositing amorphous nickel oxide nanoflakes (A-NiOx) on the surface of crystalline Mn-doped Ni2P nanosheet arrays (Mn5-Ni2P). The optimal sample exhibits quite low overpotentials for the HER (55 mV) and OER (255 mV) to afford a current density of 10 mA cm−2 in alkaline electrolyte. Moreover, the two-electrode water electrolysis device only requires a small cell voltage of 1.54 V to deliver 10 mA cm−2 and shows no obvious attenuation for 20 hours.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文

来源: X-MOL 2019-09-26

RSC主编推荐:纳米领域精彩文章快览(免费阅读原文)

英国皇家化学会(RSC)是一个超过175年历史的面向全球化学家的非营利会员制机构,旗下拥有44种期刊,其中很多在化学领域有很高影响力。为了进一步帮助广大读者追踪科技前沿热点,X-MOL团队与英国皇家化学会合作,推出英国皇家化学会期刊主编推荐的精彩文章快览,本期文章属“纳米领域”,英文点评来自英国皇家化学会期刊的主编。如果大家对我们的解读有更多的补充和点评,欢迎在文末写评论发表您的高见!Chemical Science (IF: 9.556)1. Tumor-acidity activated surface charge conversion of two-photon fluorescent nanoprobe for enhanced cellular uptake and targeted imaging of intracellular hydrogen peroxideChem. Sci., 2019, Advance Article DOI: 10.1039/C9SC03781KResearchers from China have developed a two-photon fluorescent nanoprobe for the tumor-targeted imaging of intracellular hydrogen peroxide. The probe is made from grafting H2O2-responsive and two-photon fluorophore, NABP, onto hydrophilic biopolymer glycol chitosan (GC). The nanoprobe exhibited good sensitivity and selectivity and could be applied to imaging intracellular hydrogen peroxide in tumours.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Three-dimensional DNA nanostructures to improve the hyperbranched hybridization chain reactionChem. Sci., 2019, Advance Article DOI: 10.1039/C9SC02281CScientists at Nankai University have developed an innovative strategy to improve the efficiency of the DNA hybridization chain reaction (HCR) using DNA nanotechnology and nucleic acid amplification. DNA hairpins are assembled at the vertexes of quadrivalent tetrahedral DNA nanostructures (qTDNs), which enhances the reaction kinetics of HCR and the DNA nanostructures enhance the cell internalisation efficiency and biostability of the DNA probes.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文Nanoscale Horizons (IF: 9.095)1. Polarity-controllable MoS2 transistor for adjustable complementary logic inverter applicationsNanoscale Horiz., 2019, Advance Article DOI: 10.1039/C9NH00275HA MoS2-based field effect transistor is reported that can alternately operate as either a p- or n-type semiconductor in the same device. Compared to existing individual devices, this device could save almost twice the process time and price. This concept is useful and valuable for the future fabrication of advanced devices. We believe that these discoveries will not just lower the cost of production but will also revolutionize future complementary metal-oxide–semiconductor technology.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Role of the anatase/TiO2(B) heterointerface for ultrastable high-rate lithium and sodium energy storage performanceNanoscale Horiz., 2019, Advance Article DOI: 10.1039/C9NH00402EAnatase TiO2, extensively studied previously as the anode material of lithium-ion batteries (LIBs), has recently attracted much attention as the anode for sodium-ion batteries (SIBs) because of its low-cost, non-toxicity and 3D open structure. However, the capacity and rate capability are kinetically restricted by its poor electrical conductivity, phase transition and agglomeration. Herein, the authors employed a one-step hydrothermal and post-heat method for the fabrication of anatase/TiO2(B) dual-phase nanoflower anodes, to elucidate the role of the anatase/TiO2(B) heterointerface in LIBs and SIBs. The kinetics analyses and DFT calculations revealed that the anatase/TiO2(B) heterointerface can act as an ‘ion reservoir’, arising from the lower adsorption energies of Li+/Na+ as well as the internal electric field at the anatase/TiO2(B) interface, which provided more sites for Li+/Na+ storage and ameliorated charge transport. This work is of utmost significance to guiding the rational design of multi-functional electrode materials for secondary batteries.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文3. Antimonene-based flexible photodetectorNanoscale Horiz., 2019, Advance Article DOI: 10.1039/C9NH00445AAs a new 2D material, antimonene has drawn intensive attention in recent years. However, the practical application of antimonene in the optoelectronic field has been limited though, by the lack of a high concentration and stable “ink” that is suitable for device fabrication. Compared with other 2D materials, antimonene has a short layer distance and strong binding energy, and hence, requires different exfoliation and surface modification methods. In this article we report the efficient fabrication and surface modification of antimonene nanosheets by polymer ionic liquid (PIL) assisted liquid exfoliation. This new method yields micron-size antimonene nanosheets over 20%, and to our best knowledge, this is the highest yield ever reported in the literature. Flexible photodetectors based on hybrid structures of surface modified few layer antimonene were successfully fabricated.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文

来源: X-MOL 2019-09-19

RSC主编推荐:材料领域精彩文章快览(免费阅读原文)

英国皇家化学会(RSC)是一个超过175年历史的面向全球化学家的非营利会员制机构,旗下拥有44种期刊,其中很多在化学领域有很高影响力。为了进一步帮助广大读者追踪科技前沿热点,X-MOL团队与英国皇家化学会合作,推出英国皇家化学会期刊主编推荐的精彩文章快览,本期文章属“材料领域”,英文点评来自英国皇家化学会期刊的主编。如果大家对我们的解读有更多的补充和点评,欢迎在文末写评论发表您的高见!Chemical Science (IF: 9.556)1. Engineering protein polymers of ultrahigh molecular weight via supramolecular polymerization: towards mimicking the giant muscle protein titinChem. Sci., 2019, Advance ArticleDOI: 10.1039/C9SC02128KA team of researchers from China and Japan have developed a supramolecular polymerisation strategy to synthesise protein polymers with ultrahigh molecular weight that mimics the giant muscle protein titin. The scientists engineered protein macromonomers by protein fragment reconstitution to make protein polymers with an average molecular weight of 0.5MDa, which could be used for biomaterials with improved physical and mechanical properties.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Electrochemical synthesis of Au@semiconductor core–shell nanocrystals guided by single particle plasmonic imagingChem. Sci., 2019, Advance Article DOI: 10.1039/C9SC02804HScientists from Nanjing University have reported a new proof-of-concept strategy for controllable synthesis of metal@semiconductor core–shell nanocrystals through a combination of electrochemical deposition and plasmonic imaging. This simple and universal method leads to the improvement of plasmonic photocatalysts.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文Materials Horizons (IF: 14.356)1. Spatially modulated stiffness on hydrogels for soft and stretchable integrated electronicsMater. Horiz., 2019, Advance Article DOI: 10.1039/C9MH01211GIn this work, we proposed a local stiffening strategy through additional crosslinking on hydrogels for spatial modulation of hydrogel stiffness. This is a general method to manipulate the stiffness of hydrogel materials in a spatially programmable manner, and is the first time to realize integration of rigid electronic components with soft hydrogels for functional soft and stretchable electronics. Different from existing studies focusing on the modification of the bulky mechanical properties (e.g., stiffness) of hydrogels as a whole, this study presented the concept of locally stiffened hydrogels where the stiffness on different areas of a hydrogel varies. Based on this result, integration of commercial electronic components for functional hydrogel electronics is achieved, offering a promising solution to the conundrum of coupling rigid electronic components with soft substrate materials. In addition, this is also the first time that multi-index monitoring of human health conditions with stretchable and biocompatible hydrogels has been realized. This research article offers a novel route for spatially controllable modulation of the mechanical properties of soft materials. And it is believed to be helpful for the fabrication of functional stretchable electronics with emerging biomaterials, especially aiming at the most advanced wearable healthcare applications where biocompatibility and mechanical coupling with the human body are highly appreciated.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Controllable and stable organometallic redox mediators for lithium oxygen batteriesMater. Horiz., 2019, Advance Article DOI: 10.1039/C9MH01043BRechargeable lithium–oxygen (Li–O2) batteries are very important due to their very high theoretical energy density. If they will work properly, they will be able to rival internal combustion engines in terms of energy density and cost, thus revolutionizing electro-mobility and ground transportation. The operation of rechargeable Li–O2 batteries depends crucially on the reversible formation/decomposition of Li2O2 at the cathode upon discharge/charge cycling. One of the greatest challenges with these systems is their recharge, i.e. decomposing Li2O2, at low enough potentials, that do not endanger the stability of the electrolyte solution and the carbon cathode. Since Li2O2 is electrically insulating, its decomposition requires a too high over-potential – above 1 V even at low rates. Consequently, it mandatory to use redox mediators (RMs) in solution phase in Li–O2 batteries is mandatory. Their appropriate selection is critically important. We seek for RMs that are oxidized on the cathodes of Li – ion cells low enough potentials and then these RMs oxidize the Li2O2 from solution phase. Unfortunately, many RMs suggested and tested so far suffer from intrinsic instability problems. We developed a systematic methodology to select them properly. Here we introduce corrole-chelated metal complexes as effective and intrinsically stable RMs for Li–O2 batteries. The properties of these RMs can be controlled by the nature of their central metallic and the corrole structure. By a systematic study we were able to find a new, intrinsically stable RM for Li–O2 cells – corrole-chelated copper complex and to prove its superiority over benchmark systems. We anticipate that this study will promote a rational design for the development of most suitable redox mediators for active metal (Li, Na) oxygen batteries.  限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文3. A highly asymmetric interfacial superstructure in WC: expanding the classic grain boundary segregation and new complexion theoriesMater. Horiz., 2019, Advance Article DOI: 10.1039/C9MH00969HIn this communication, we reveal a highly asymmetric interfacial superstructure at a mixed twist and tilt grain boundary (GB) of WC that significantly broadens our understanding of GB segregation structures. Specifically, this interfacial superstructure exhibits the following features that differ strikingly from all prior experimental observations and are beyond the predictions of any existing theoretical models: (i) the segregation profiles of Ti and Co are highly asymmetric; (ii) the maxima of the Ti and Co segregation both occur at the off-the-center atomic planes in the opposite sides, separated by a W-rich atomic layer in between; and (iii) solute segregations further induce asymmetric interfacial structural transitions, i.e., Ti segregation drives an interfacial symmetry change from the hexagonal WC grain to a cubic-TiC-like interfacial layer on the one side, while Co induces a partially-disordered segregation layer on the other side. Such a highly asymmetric interfacial superstructure is not anticipated from the classic Langmuir–Mclean type GB segregation model, as well as the newer diffuse-interface and multilayer lattice-adsorption models; moreover, it is beyond (differs significantly from) the Dillon-Harmer complexions and recent observations of several other interfacial superstructures. Yet, we expect that similar highly asymmetric interfacial superstructures may not be uncommon (despite being unrecognized in prior studies), and we propose factors favoring their formation. Thus, this study extends our fundamental knowledge of atomic level GB segregation structures, which can have broad technological implications. 限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文Biomaterials Science (IF: 5.831)1. Cell-imprinted biomimetic interface for intelligent recognition and efficient capture of CTCsBiomater. Sci., 2019, Advance ArticleDOI: 10.1039/C9BM01008DThe presence of CTCs is a dangerous signal for tumor progression, as they leak into the blood stream from the primary tumor and could potentially invade to other organs, causing metastasis. Unfortunately, they’re extremely rare and thus hard to identify, which poses great challenges for early tumor diagnosis. In a recent publication in Biomaterials Science, Gao et al from Shanghai Jiao Tong University developed a cell-imprinted biomimetic interface, which could intelligently recognize and efficiently capture CTCs, with an over 55% capture efficiency towards spiked MCF-7 cells, a human breast cancer cell line, from rabbit whole blood samples.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文

来源: X-MOL 2019-09-12

RSC主编推荐:纳米领域精彩文章快览(免费阅读原文)

英国皇家化学会(RSC)是一个超过175年历史的面向全球化学家的非营利会员制机构,旗下拥有44种期刊,其中很多在化学领域有很高影响力。为了进一步帮助广大读者追踪科技前沿热点,X-MOL团队与英国皇家化学会合作,推出英国皇家化学会期刊主编推荐的精彩文章快览,本期文章属“纳米领域”,英文点评来自英国皇家化学会期刊的主编。如果大家对我们的解读有更多的补充和点评,欢迎在文末写评论发表您的高见!Chemical Science (IF: 9.556)1. Poly(ethylene glycol) nanocomposites of sub-nanometer metal oxide clusters for dynamic semi-solid proton conductive electrolytesChem. Sci., 2019, Advance Article DOI: 10.1039/C9SC02779CResearchers from the South China University of Technology have obtained semi-solid nanocomposites by dispersing metal oxide clusters in the melt of polyethylene glycol (PEG). They show promising proton conductivities due to the fast proton transportation through the dynamic polymer chains. The nanocomposites also show pseudo-plastic properties: the nanocomposites behave like solids with negligible flow at high concentrations, but at high-speed shear forces the viscosity of the composites decreases and they can flow. The study could be useful in the design of other semi-solid proton conductors.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Ultra-Permeable Polyamide Membranes Harvested by Covalent Organic Framework Nanofiber Scaffolds: A Two-in-One StrategyChem. Sci., 2019, Advance Article DOI: 10.1039/C9SC03088CScientists from Nanjing Tech University have prepared ultra-permeable nanofiltration membranes with a water permeance of up to 31.1 L m-2 h-1 bar-1 and a Na2SO4 rejection rate of about 95%. Most nanofiltration membranes are quite thick and have a high transport resistance, but the highly porous and hydrophilic carbon organic framework (COF) nanofiber scaffolds used in this study can create ultrathin polyamide layers with large surface areas. This membrane has potential to be used in delivering clean water across the globe, which is a major issue.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文Nanoscale Horizons (IF: 9.095)1. Understanding the noble metal modifying effect on In2O3 nanowires: highly sensitive and selective gas sensors for potential early screening of multiple diseasesNanoscale Horiz., 2019, Advance Article DOI: 10.1039/C9NH00404ADetection of multiple volatile organic compounds in human exhaled breath has the potential to help with the early diagnosis of diseases. However, detecting trace levels of exhaled biomarkers remains a challenge and the corresponding mechanism for the selectivity is still unclear. Herein, ultrafine In2O3 nanowires (NWs) modified with Au, Ag, and Pt noble metal nanoparticles (NMNPs) are synthesized using the electrospinning method and are used to build semiconductor sensors. It is exciting to observe that the introduction of NMNPs enhances the sensing performance, but also effectively tunes the selectivity. The Au-, Ag- and Pt-modified In2O3 NW sensors show excellent selectivity to hydrogen sulfide, formaldehyde, and acetone biomarkers, respectively. To understand the mechanism of the selectivity, theoretical simulation is performed and it is found that the specific absorption energies between the modified NWs and the target gases along with the “spillover effect” work together to give the selectivity properties. The work provides a simple, low-cost, effective tool for early screening of halitosis, breast cancer, and diabetes at the same time and an in-depth understanding of the enhanced sensing performance.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Incorporating mixed cations in quasi-2D perovskites for high-performance and flexible photodetectorsNanoscale Horiz., 2019, Advance Article DOI: 10.1039/C9NH00391FThe intrinsic instability of 3D perovskites against moisture restricts their use for practical applications in optoelectronics devices. Great efforts have been devoted to developing quasi-2D perovskites due to their much better stability, but their device performance is still poor compared to their 3D counterparts due to inefficient charge transport. In this paper, for the first time, an exceptionally simple synthetic method is developed to incorporate a unique combination of formamidinium (FA) and cesium (Cs) mixed cations with well-controlled composition into (iBA)2(MA)3Pb4I13 (iBA = iso-butylamine and MA = methylamine) to achieve quasi-2D perovskite films with remarkably enhanced film quality. This optimized mixed cation incorporation can not only improve the charge transport among the inorganic metal halide layers, but also enable excellent operational stability and performance enhancement in photodetection, especially for flexible photodetectors with high responsivities, short response times and good mechanical robustness. Overall, incorporating these exclusive mixed cations provides valuable design guidelines and new insights into stable perovskite materials for high-performance flexible photodetectors.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文3. A silk-based sealant with tough adhesion for instant hemostasis of bleeding tissuesNanoscale Horiz., 2019, Advance Article DOI: 10.1039/C9NH00317GAdhesion to wet tissue surfaces, especially in highly dynamic biological environments, is important in clinical fields but remains extremely challenging. Currently available sealants are cytotoxic, adhere weakly to tissues, or cannot be used in wet and dynamic environments within the body. To address these challenges, marine mussels, which secrete catechol-rich foot proteins to maintain strong adhesion under seawater, provide an ideal model for researchers to design high-performance adhesive systems. However, the existing biomimetic technologies focus on imitating the catechol feature of the mussel foot proteins, while the importance of their hierarchically assembled nanostructures for robust underwater adhesion is neglected. We envisioned that simultaneously mimicking the chemical composition and hierarchically assembled nanostructures is a promising strategy to enhance the wet adhesion properties of bio-inspired materials. Here, we reported a facile method for developing strong underwater sealants with hierarchically assembled nanostructures by introducing tannic acid into silk fibroin to address the aforementioned limitations. The co-assembly behavior of tannic acid with the natural biomolecules can open up a new avenue for the one-step development of functional nanoscale materials and hierarchical bio-assemblies.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文

来源: X-MOL 2019-08-22

RSC主编推荐:材料领域精彩文章快览(免费阅读原文)

英国皇家化学会(RSC)是一个超过175年历史的面向全球化学家的非营利会员制机构,旗下拥有44种期刊,其中很多在化学领域有很高影响力。为了进一步帮助广大读者追踪科技前沿热点,X-MOL团队与英国皇家化学会合作,推出英国皇家化学会期刊主编推荐的精彩文章快览,本期文章属“材料领域”,英文点评来自英国皇家化学会期刊的主编。如果大家对我们的解读有更多的补充和点评,欢迎在文末写评论发表您的高见!Chemical Science (IF: 9.556)1. A sterically hindered asymmetric D–A–D' thermally activated delayed fluorescence emitter for highly efficient non-doped organic light-emitting diodesChem. Sci., 2019, Advance ArticleDOI: 10.1039/C9SC01686DA team of scientists in China have reported a new design strategy for thermally activated delayed fluorescence (TADF) materials which can be used for high-efficiency and low-cost OLEDs. Linking donor and acceptor groups at the ortho-position gives a spatially close D–A interaction, resulting in reduced vibrations and suppressed non-radiative pathways. One of the emitters designed by the team exhibits a record-high EQE of 28.7% compared to existing non-doped OLEDs.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文2. A symbiotic hetero-nanocomposite that stabilizes unprecedented CaCl2-type TiO2 for enhanced solar-driven hydrogen evolution reactionChem. Sci., 2019, Advance Article DOI: 10.1039/C9SC01216HResearchers at Jilin University have designed a new symbiotic hetero-nanocomposite that contains an unprecedented CaCl2-type titania phase inter-grown with rutile TiO2, which exhibits enhanced performance for solar-driven hydrogen evolution. Through a tight connection by edge dislocations with rutile TiO2, a CaCl2/rutile TiO2 heterojunction forms which has a high reduction capacity and charge separation efficiency, leading to a water splitting activity far superior to that of P25, the commercial benchmark photocatalyst.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文Materials Horizons (IF: 14.356)1. Digging for topological property in disordered alloys: the emergence of Weyl semimetal phase and sequential band inversions in PbSe–SnSe alloysMater. Horiz., 2019, Advance Article DOI: 10.1039/c9mh00574aTopological properties are enabled and protected by symmetry. Yet, to realize these properties in real materials researchers have broadened databases to include alloys. Do topological properties survive if alloy disorder comes into play? In this work, we have demonstrated for substitutionally random alloys a new concept of a fully-atomistic, topological description, which can restore all local symmetry breaking effects due to alloy disorders, without assuming in advance an averaged or artificially high-symmetry structure. By using a combined strategy of a specially-designed supercell model, band unfolding mechanism and topological invariant calculation, we show the topological phase transition under alloy disorder at an atomic resolution, with all E vs. k band dispersion restored. Our concept goes beyond the ‘monomorphous’ alloy theory, which assumes a single local environment for all alloy atoms. For (PbSe)1−x(SnSe)x alloy, we find a Weyl semimetallic, sequential band inversion regime between normal insulator and topological crystalline insulator phases, even at zero external magnetic field, which is unexpected and can only be explained by the atomistic alloy disorder effect. Our findings expand the horizons for designing and predicting new physics, which originates not from pre-existed symmetries in building blocks but from the symmetry lowering by applying as a disordered alloy.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Charge control of fluorescent probes to selectively target the cell membrane or mitochondria: theoretical prediction and experimental validationMater. Horiz., 2019, Advance Article DOI: 10.1039/c9mh00906jFluorescent probe discovery still proceeds largely through expensive trial-and-error experiments, because the intrinsic mechanism of fluorescent probes at the molecular level is not unraveled. Exploring material design strategies by computational methods to complement and assist experimental material design and synthesis is an effective way. In this manuscript, we report a strategy for designing novel fluorescent probes which can selectively target the cell membrane or mitochondria, by multiscale computational modeling. The innovative concept is realized by combining large-scale molecular dynamics simulations and the hybrid QM/MM model protocol, firstly to demonstrate the conformations of fluorescent probes in a complex cell membrane environment and then to characterize the fluorescent emission of the probes in this environment. We identify the specific roles (permeation ability control or fluorescent emission control) of different functional groups of the fluorescent probes in their targeting process, and then we design and synthesize fluorescent probes to selectively “light-up” the cell membrane or mitochondria. Validated by experiments, the designed fluorescent probes show excellent bioimaging behaviour with high selectivity on different subcellular organelles. This demonstrates the power of the proposed concept, which should be applicable to the design of a wide range of clinical materials. 限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文3. The impact of nanoparticle shape on cellular internalisation and transport: what do the different analysis methods tell us?Mater. Horiz., 2019, Advance Article DOI: 10.1039/c9mh00664hThis article focuses on how nanoparticle shape affects the cellular internalisation and transport of nanoparticles inside cells and what the different analytical methods for determining nanoparticle internalisation by cells tell us. Rod-shaped nanoparticles typically show greater cellular internalisation relative to spherical nanoparticles, although there are studies with contradictory conclusions. The contradiction may be a result of differences in the materials being used in the comparison and/or a result of the analytical method employed. Finally, future opportunities in studying cellular internalisation with 3D cell-culture models and light-sheet microscopy are discussed.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文Chemical Communications (IF: 6.164)1. In Situ Chemical Redox and Functionalization of Graphene Oxide: Toward New Cathodic Photoelectrochemical BioanalysisChem. Commun., 2019, Advance Article DOI: 10.1039/C9CC03877AThis report outlines the first exploration of graphene oxide (GO) itself as a light harvesting material with an innovative in situ chemical redox and functionalization (CRF) strategy for versatile and high-throughput cathodic photoelectrochemical (PEC) bioanalysis.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文

来源: X-MOL 2019-08-15

RSC主编推荐:有机领域精彩文章快览(免费阅读原文)

英国皇家化学会(RSC)是一个超过175年历史的面向全球化学家的非营利会员制机构,旗下拥有44种期刊,其中很多在化学领域有很高影响力。为了进一步帮助广大读者追踪科技前沿热点,X-MOL团队与英国皇家化学会合作,推出英国皇家化学会期刊主编推荐的精彩文章快览,本期文章属“有机领域”,英文点评来自英国皇家化学会期刊的主编。如果大家对我们的解读有更多的补充和点评,欢迎在文末写评论发表您的高见!Chemical Science (IF: 9.556)1. Catalyst shuttling enabled by thermoresponsive polymeric ligand: facilitating efficient cross-couplings with continuously recyclable ppm levels of palladiumChem. Sci., 2019, Advance ArticleDOI: 10.1039/C9SC02171JResearchers from Fudan University have designed a biphasic catalyst migration mode that enables efficient cross-coupling as well as rapid and complete on-site recycling of catalysts. The new thermoresponsive catalyst composed of Pd and polymeric phosphine ligand was used in Suzuki-Miyaura cross-coupling and enables an ultra-low Pd loading method with catalysts transferring between aqueous and organic phases. The system works on 73 examples in up to 99% isolated yields.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Redox-neutral ortho-C–H amination of pinacol arylborates via palladium(II)/norbornene catalysis for aniline synthesisChem. Sci., 2019, Advance ArticleDOI: 10.1039/C9SC02759AScientists at Wuhan University report a new phosphine free method for the synthesis of structurally diverse anilines, which is scalable and tolerates a wide range of functional groups. This method is very useful for synthesing halogenated anilines, which can be difficult to do by other synthetic strategies. Deuterium labelling studies show that the reaction goes through a redox-neutral ipso-protonation mechanism. This study should be a valuable strategy for others wishing to synthesise anilines.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文Organic Chemistry Frontiers (IF: 5.076)1. Ligandless nickel-catalyzed transfer hydrogenation of alkenes and alkynes using water as the hydrogen donorOrg. Chem. Front., 2019, 6, 2619-2623 DOI: 10.1039/C9QO00616HThe first general route for nickel-catalyzed transfer hydrogenation reaction of alkenes and alkynes using water as the hydrogen source has been developed. The method features the use of inexpensive and air-stable nickel(II) salt as the pre-catalyst and zinc powder as a reducing agent, allowing the TH reaction to occur under mild reaction conditions with a wide substrate scope and functional group tolerance. No ligand was required for this reaction. The reaction has also been applied successfully to the reduction of nitrogen-containing heterocycles.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文2. A novel chiral DMAP–thiourea bifunctional catalyst catalyzed enantioselective Steglich and Black rearrangement reactionsOrg. Chem. Front., 2019, Advance Article DOI: 10.1039/C9QO00691EThe first novel and efficient chiral DMAP–thiourea bifunctional catalyst has been successfully developed and applied in highly enantioselective acyl-transfer reactions. A series of 1,3-oxazolyl carbonates are efficiently transformed to C-carboxyazlactones (Steglich rearrangement) by employing 5 mol% of this bifunctional nucleophilic catalyst with good yields and excellent enantioselectivities (up to 90% yield and 97% ee), and 2-benzofuranylcarbonates are also converted to 3,3-disubstituted benzofuran-2-ones (Black rearrangement) with satisfactory asymmetric induction (up to 92% yield and 87% ee).限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文

来源: X-MOL 2019-08-08

RSC主编推荐:能源领域精彩文章快览(免费阅读原文)

英国皇家化学会(RSC)是一个超过175年历史的面向全球化学家的非营利会员制机构,旗下拥有44种期刊,其中很多在化学领域有很高影响力。为了进一步帮助广大读者追踪科技前沿热点,X-MOL团队与英国皇家化学会合作,推出英国皇家化学会期刊主编推荐的精彩文章快览,本期文章属“能源领域”,英文点评来自英国皇家化学会期刊的主编。如果大家对我们的解读有更多的补充和点评,欢迎在文末写评论发表您的高见!Chemical Science (IF: 9.556)1. Hierarchically Porous Carbons as Supports for Fuel Cell Electrocatalysts with Atomically Dispersed Fe-Nx MoietiesChem. Sci., 2019, Advance Article DOI: 10.1039/C9SC01154DIn this collaboration between researchers from several institutions in China, as well as Germany, they use a hierarchically porous carbons (HPCs)-supporting approach to prepare Fe-phenanthroline (Fe-phen) derived Fe-Nx-C catalysts that are highly active for the oxygen reduction reaction (ORR). By using HPCs as the carbon support, they can prevent the formation of inactive Fe NPs during pyrolysis, which is a problem with commercial carbon black supports, and also optimise the porous morphology of the catalysts. The catalyst shows excellent ORR activity in both half cell (half-wave potential of 0.80 V in 0.5 M H2SO4) and in H2-air proton exchange membrane fuel cells (PEMFCs) (442 mA cm-2 at a working voltage of 0.6 V), which makes it among the best non-PGM catalysts for PEMFCs. Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文2. A review of biomass materials for advanced lithium–sulfur batteries Chem. Sci., 2018, Advance Article DOI: 10.1039/C9SC02743BScientists at Zhejiang University of Technology have written this Perspective article on biomass materials for advanced lithium-sulfur batteries. Using biomass-derived materials for these batteries is promising due to their many advantages including strong physical and chemical adsorptions, abundant sources, low cost and environmental friendliness. This Perspective focuses on aspects of carbon hosts, separator materials, bio-polymer binders and all solid-state electrolytes, to shed light on the rational design and utilisation of biomass-derived materials in Li-S batteries, and discusses future opportunities in this area.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文Sustainable Energy & Fuels (IF 4.912)1. High capacity vanadium oxide electrodes: effective recycling through thermal treatmentSustainable Energy Fuels, 2019, Advance Article DOI: 10.1039/C9SE00188CIn this work, thermal treatment of cycled V2O5/carbon nanotube (CNT) binder free electrodes is demonstrated for the first time, including demonstration of a capacity for the regenerated electrodes exceeding 200 mA h g-1. 限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Enhancing the production of hydrogen peroxide from electrocatalytic oxygen reduction reaction by tailoring the electronic states of single-walled carbon nanotubes: a synergistic effect from interior filling and exterior oxidation Sustainable Energy Fuels, 2019, 3, 1951-1956 DOI: 10.1039/C9SE00287AThe authors find that oxidized phosphomolybdic acid (HPMO)-filled single-walled carbon nanotubes (SWCNTs)  (O-HPMO@SWCNTs) possess much better electrocatalytic two-electron ORR performance than the unitary modified HPMO-filled SWCNTs (HPMO@SWCNTs) or oxidized SWCNTs (O-SWCNTs).限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文Energy & Environmental Science (IF: 33.25)1. A versatile single-ion electrolyte with a Grotthuss-like Li conduction mechanism for dendrite-free Li metal batteriesEnergy Environ. Sci., 2019, Advance Article DOI: 10.1039/C9EE01473JThe authors report a versatile single-ion electrolyte, achieved by coordinating the anions in the electrolyte on the open metal sites of a metal organic framework, which has wide applications including suppressing Li dendrites, suppressing the dissolution of Mn2+ in Li‖LiMn2O4 full cells and reducing the polarization of Li–O2 batteries.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Ion-solvating membranes as a new approach towards high rate alkaline electrolyzersEnergy Environ. Sci., 2019, Advance Article DOI: 10.1039/C9EE00832BIn this work, demonstration cells based on KOH doped polybenzimidazole membranes and nickel based electrodes exhibited 1700 mA cm−2 at 1.8 V, far exceeding what has previously been achieved with membranes in alkaline environments without platinum group metal catalysts, and is comparable to state-of-the-art polymer electrolyte membrane (PEM) electrolyzers.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文

来源: X-MOL 2019-08-01

RSC主编推荐:纳米领域精彩文章快览(免费阅读原文)

英国皇家化学会(RSC)是一个超过175年历史的面向全球化学家的非营利会员制机构,旗下拥有44种期刊,其中很多在化学领域有很高影响力。为了进一步帮助广大读者追踪科技前沿热点,X-MOL团队与英国皇家化学会合作,推出英国皇家化学会期刊主编推荐的精彩文章快览,本期文章属“纳米领域”,英文点评来自英国皇家化学会期刊的主编。如果大家对我们的解读有更多的补充和点评,欢迎在文末写评论发表您的高见!Chemical Science (IF: 9.556)1. In situ real-time tracing of hierarchical targeting nanostructures in drug resistant tumors using diffuse fluorescence tomographyChem. Sci., 2019, Advance Article DOI: 10.1039/C9SC01841GCurrently, limited routes are available for stimuli responsive nanoparticles to address multidrug resistance. Scientists from China have developed a theranostic nanoplatform with a zwitterionic shell that peels off in acidic tumour environments, allowing the nanoparticles to penetrate into tumour cells. Tumour growth was completely inhibited, and a 5-fold increase in the rate of drug accumulation is achieved, without causing any damage to normal organ tissue.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Dynamic colloidal nanoparticle assembly triggered by aptamer–receptor interactions on live cell membranesChem. Sci., 2019, Advance Article DOI: 10.1039/C9SC02693BResearchers from China have engineered an aptamer and DNA displacement reaction-based dynamic system, consisting of a core nanoparticle and small satellite nanoparticles, which is capable of transforming its nanostructure in response to epithelial cell adhesion molecules on live cell membranes. The assembly through aptamer–receptor interactions can be captured by SERS. This provides a new strategy for engineering dynamic nano-systems for applications in complex biological environments.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文Nanoscale Horizons (IF: 9.095)1. Top-down fabrication of small carbon nanotubesNanoscale Horiz., 2019, Advance Article DOI: 10.1039/C9NH00285EThe diameter and chirality of carbon nanotubes (CNTs) should be well-defined and reproducible for applications like transistors or photoelectronic devices. However, synthesising consistent nanotubes is very hard and it is usually done using catalysts in bottom-up approaches. The authors of this work propose that there could be a strategy to produce CNTs through the opposite process, i.e., the continuous atom removal. They routinely made smaller nanotubes while maintaining their structural perfection. The smallest nanotubes reaching their theoretical diameter limits were easily reached for any few-walled CNTs (1–4 shells).限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文2. A champagne inspired dual chain-responsive thrombolytic drug release platform based on black phosphorus nanosheets for accelerated thrombolysisNanoscale Horiz., 2019, Advance Article DOI: 10.1039/C9NH00344DThrombolytic drugs are often easily neutralized in the blood reducing their therapeutic effect. You can't increase the dose to combat this becuase excess amounts of thrombolysis drugs can increase the lethal risk of hemorrhage. Here, authors designed a dual chain-responsive nanoplatform based on black phosphorus (BP) and mesoporous silica nanoparticles (MSNs) for thrombolytic drug delivery. BP can induce hyperthermia under the irradiation of a near-infrared laser, resulting in the accelerated release of the drug (uPA) and the generation of bubbles (the vaporization of perfluoro-n-pentane loaded into the MSNs). Thrombolytic assessment of this platform in vitro and in vivo reveals that the platform presents effective and safe thrombolytic drug delivery with accelerated and enhanced thrombolysis.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文3. Surface functionalized 3D carbon fiber boosts the lithium storage behaviour of transition metal oxide nanowires via strong electronic interaction and tunable adsorption energyNanoscale Horiz., 2019, Advance Article DOI: 10.1039/C9NH00327DThe Li-ion storage properties of transition metal oxide (TMOs) electrodes such as Li-ion intercalation-based electrodes are usually enhanced by hybridizing with 3D carbon scaffolds. However, understanding of the large variation in performance enhancement is rarely reported. As a proof of concept, intercalation reaction-based TMO (V2O5 and TiO2) nanowires were hybridized with two types of 3D carbon scaffolds (namely pristine carbon fiber cloth, CFC and porous N-doped CFC, PNCFC). Theoretical calculation predicts that the PNCFC@TMO hybrids displayed reasonably lower adsorption energy towards easier Li-ion intercalation than those of CFC@TMOs. Electrochemical properties further disclosed that PNCFC-based hybrids exhibit the best lithium storage performance. Furthermore, in situ Raman, XPS and charge redistribution studies not only decipher that strong electronic interaction exists between PNCFC and TMOs but also consistently affirm that such interaction is ascribed to the shift of the p-adsorption energy, facilitating rapid kinetics and leading to improved Li storage properties.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文

来源: X-MOL 2019-07-25

RSC主编推荐:材料领域精彩文章快览(免费阅读原文)

英国皇家化学会(RSC)是一个超过175年历史的面向全球化学家的非营利会员制机构,旗下拥有44种期刊,其中很多在化学领域有很高影响力。为了进一步帮助广大读者追踪科技前沿热点,X-MOL团队与英国皇家化学会合作,推出英国皇家化学会期刊主编推荐的精彩文章快览,本期文章属“材料领域”,英文点评来自英国皇家化学会期刊的主编。如果大家对我们的解读有更多的补充和点评,欢迎在文末写评论发表您的高见!Chemical Science (IF: 9.556)1. Uncovering two kinetic factors in the controlled growth of topologically distinct core–shell metal–organic frameworksChem. Sci., 2019, Advance Article DOI: 10.1039/C9SC02576FResearchers from ShanghaiTech University have revealed two kinetic factors - nucleation kinetics and dissolution kinetics - that determine the growth of uniform Zr/Hf-MOF shells on a series of cover MOFs. This is a promising approach to increase the complexity of MOFs and explore new functions. Nucleation kinetics controls the nucleus size of the shell MOF and therefore its surface coverage and uniformity on the core MOF. Dissolution kinetics determines how fast the core MOF dissolves during the growth process.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Rational synthesis of three-dimensional core–double shell upconversion nanodendrites with ultrabright luminescence for bioimaging applicationChem. Sci., 2019, Advance Article DOI: 10.1039/C9SC01586HScientists in China have made a new class of three-dimensional upconversion core–double-shell nanodendrites (UCNDs) including an active core (NaYF4:Yb,Er,Ca) capped by a transition layer (NaYF4:Yb,Ca) and an active outer shell (NaNdF4:Yb,Ca). The UCNDs exhibit enhanced upconversion luminescence emission by 5 and 15 times relative to reference truncated core–shell UCNPs and spherical core UCNPs, and were demonstrated as efficient long-term luminescent probes for in vitro and in vivo bioimaging.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文Materials Horizons (IF: 14.356)1. When defects become'dynamic': halide perovskites: a new window on materials?Mater. Horiz., 2019, Advance Article DOI: 10.1039/c9mh00606kAlthough Pb Halide perovskites (HaPs) can be prepared as organic electronic materials, they resemble top-quality inorganic semiconductors, especially with respect to their low defect densities, as derived from optical and electronic transport studies. Among causes for such low defect densities were 'defect-tolerance' (proposed) and 'self-healing' (experimentally identified). We show that HaPs are likely an example of a class of materials that cannot support static bulk defect densities significantly above thermodynamically-dictated densities. The reasons are (a) the free energy to form HaPs (from binary halides) is less than the formation energies of (static) defects in them and (b) the small kinetic stabilization of such defects. We summarize the evidence for such a situation and conclude that higher defect densities in polycrystalline films likely result from the (expected) smaller defect formation energy at surfaces and grain boundaries than in the bulk. This situation directly limits the options for doping such materials, and leads to the counter-intuitive conclusion that a low free energy of formation (from the binaries) can lead to self-healing and, consequently, to low densities of static defects, to be distinguished from dynamic ones. The latter can be benign in terms of (opto)electronic performance, because of their relatively short lifetimes. We propose that the conditions that we formulated can serve as search criteria for other low defect density materials, which can be of interest and beneficial, also for applications beyond optoelectronics.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文2. A smart AIEgen-functionalized surface with reversible modulation of fluorescence and wettability Mater. Horiz., 2019, Advance Article DOI: 10.1039/c9mh00798aAggregation-induced emission luminogens (AIEgens) are molecules in which the intramolecular motions can be the pathway to consume the energy from excitation. For the AIE molecules at the AIE nanoparticles (NPs)' surface, the restrictions of the surrounding environment to their intramolecular motions are much weaker compared to the embedded molecules in the core. This allows them to be further restricted, resulting in controllable emission properties of the AIE NPs. However, no paper on efficient control of molecular motions of the molecules on the AIE NPs' surface has been reported. This concept provides success in tuning the AIE NPs' emission intensity with ultrasensitive and fast response through the formation or dissociation of anion–π+ interactions of the NPs' surface molecules. Noteworthily, the AIE NPs can be further used to functionalize the surface, and the obtained AIEgen-functionalized surface realizes reversible modulation of fluorescence and wettability. The smart surface could meet the requirements for advanced sensing or wetting-dependent applications, such as controlling liquid droplet spreading and bacterial adhesion behavior. This concept not only provides a new strategy for tuning the fluorescence properties but also shows the ability of a functionalized surface in the applications of smart devices. 限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文3. Suppression of electron trapping by quantum dot emitters using a grafted polystyrene shellMater. Horiz., 2019, Advance Article DOI: 10.1039/c9mh00551jIn displays it is important to have small linewidths to make saturated colors. This is why nowadays quantum dots (QDs) are being used as phosphor, meaning that they convert light generated by a blue/white LED backlight. An even more attractive device would be to incorporate the QDs directly in an electroluminescent device such that no backlight is needed, the QD LED. However, until now this approach only works when a very thin emissive layer containing only a few monolayers of QDs is used, surrounded by a number of organic transport and confinement layers, of which the thickness is very critical. A major problem is that in the QD emissive layer the charge transport needs to be exactly balanced, otherwise the layer gets charged with one type of carrier, which blocks the current. The way out to a robust and simple structure would be to use a thicker layer where the QDs are simply blended with an organic host. All attempts in this direction failed due to the problem that due to their high electron affinity QDs are deep electron traps, leading to strongly unbalanced transport. Here we demonstrate that electron trapping by CdSe/CdxZn1−xS core/shell red QDs in a blue-emitting poly(di-octylfluorene) (PFO) host can be strongly suppressed by functionalizing them with a thin insulating shell of polystyrene. The strong reduction of trapping is confirmed by charge transport measurements and a voltage independent electroluminescence spectrum of hybrid polymer:QD blend LEDs. Our results open a new route towards emissive devices with narrow linewidth, where due to the preservation of charge transport there are no limits to the active layer thickness. 限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文

来源: X-MOL 2019-07-18

RSC主编推荐:有机领域精彩文章快览(免费阅读原文)

英国皇家化学会(RSC)是一个超过175年历史的面向全球化学家的非营利会员制机构,旗下拥有44种期刊,其中很多在化学领域有很高影响力。为了进一步帮助广大读者追踪科技前沿热点,X-MOL团队与英国皇家化学会合作,推出英国皇家化学会期刊主编推荐的精彩文章快览,本期文章属“有机领域”,英文点评来自英国皇家化学会期刊的主编。如果大家对我们的解读有更多的补充和点评,欢迎在文末写评论发表您的高见!Chemical Science (IF: 9.556)1. Enantioselective palladium/copper-catalyzed C–C σ-bond activation synergized with Sonogashira-type C(sp3)–C(sp) cross-coupling alkynylationChem. Sci., 2019, Advance ArticleDOI: 10.1039/C9SC02431JResearchers in China have reported a new enantioselective palladium/copper-catalyzed alkyl alkynylation of cyclobutanones with terminal alkynes via Suzuki coupling reactions to make indanones bearing an alkyne moiety and a quaternary carbon stereocentre. They synthesised a variety of TADDOL-derived phosphoramidite ligands (TFSi-Phos) to efficiently regulate the stereoselectivity of the reaction.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Practical, Metal-Free Remote Heteroarylation of Amides via Unactivated C(sp3)-H Bond FunctionalizationChem. Sci., 2019, Advance ArticleDOI: 10.1039/C9SC02564BScientists in China have disclosed a new metal-free method for the heteroarylation of amides using visible light. The reaction scope is large and is carried out under neutral conditions. This C-H bond functionalisation reaction could be used to make molecules of medicinal importance in the future.Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文Organic Chemistry Frontiers (IF: 5.076)1. Creation of bispiro[pyrazolone-3,3′-oxindoles] via a phosphine-catalyzed enantioselective [3+2] annulation of the Morita–Baylis–Hillman carbonates with pyrazoloneyldiene oxindolesOrg. Chem. Front., 2019, Advance Article DOI: 10.1039/C9QO00471HA [3+2] annulation between the Morita–Baylis–Hillman (MBH) carbonates and pyrazoloneyldiene oxindoles catalyzed by (S)-SITCP has been developed. Structurally novel bispiro[pyrazolone-3,3′-oxindoles] containing two contiguous quaternary stereogenic centers were created in excellent yields, in a diastereospecific and highly enantioselective manner.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Bistrifluoromethylated organocuprate [Ph4P]+[Cu(CF3)2]−: synthesis, characterization and its application for trifluoromethylation of activated heteroaryl bromides, chlorides and iodidesOrg. Chem. Front., 2019, Advance Article DOI: 10.1039/C9QO00527GThe synthesis and characterization of a bistrifluoromethylated organocuprate [Ph4P]+[Cu(CF3)2]− and its reactions with a variety of activated heteroaryl bromides, chlorides and iodides were described. These results showed that complex [Ph4P]+[Cu(CF3)2]− can serve as a trifluoromethylating reagent.限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文

来源: X-MOL 2019-07-11

RSC主编推荐:能源领域精彩文章快览(免费阅读原文)

英国皇家化学会(RSC)是一个超过175年历史的面向全球化学家的非营利会员制机构,旗下拥有44种期刊,其中很多在化学领域有很高影响力。为了进一步帮助广大读者追踪科技前沿热点,X-MOL团队与英国皇家化学会合作,推出英国皇家化学会期刊主编推荐的精彩文章快览,本期文章属“能源领域”,英文点评来自英国皇家化学会期刊的主编。如果大家对我们的解读有更多的补充和点评,欢迎在文末写评论发表您的高见!Chemical Science (IF: 9.556)1. Pore-Size Dominated Electrochemical Properties of Covalent Triazine Frameworks as Anode Materials for K-ion BatteriesChem. Sci., 2019, Advance Article DOI: 10.1039/C9SC02340BA team of researchers from Northeast Normal University and Shandong Normal University have made two homologous covalent triazine frameworks (CTFs) as anode materials for K-ion batteries. They find that the 2D sheetlike structure and the regular channels in the CTFs enable the intercalation/deintercalation of K-ions into/from the CTF interlayers. Additionally, the electrochemical performance relates closely to the pore size of the frameworks. The work provides a promising strategy for the rational design of high performance organic anode materials for high performance K-ion batteries.东北师范大学和山东师范大学的研究小组合成了两种同源共价三嗪骨架(CTFs),可作为钾离子电池的负极材料。他们发现这种二维片状结构以及 CTFs中的规则通道可以使钾离子可逆地嵌入/脱离CTF夹层。此外,电化学性能与框架的孔大小密切相关。该研究为合理设计高性能钾离子电池中的有机负极材料提供了一种有前景的策略。Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Structural and Defect Engineering of Cobaltosic Oxide Nanoarchitectures as Ultrahigh Energy Density and Super Durable Cathode for Zn-based BatteriesChem. Sci., 2018, Advance Article DOI: 10.1039/C9SC01902BScientists from Sun Yat-Sen University have prepared a 3D ordered mesoporous nanoarchitecture, cobaltosic oxide with rich oxygen vacancies (M-Co3O4-x) as a cathode material for rechargeable Zn-based batteries (ZBBs). Using experimental and DFT studies they show that the energy storage capacity is significantly enhanced by the synergistic effect of mesopores and O vacancies. The material achieved a remarkable capacity of 384 mAh/g at 1.0 A/g and cycling stability of 6000 at 1 A/g and 60000 at 10 A/g. Such high cycling stability has never been reported before in ZBBs and the capacity outperforms most previously reported ZBBs.中山大学的研究人员制备了一种三维有序的介孔纳米结构,这种具有丰富氧空位的四氧化三钴(M-Co3O4-x)可以作为可充电锌基电池的正极材料。实验和DFT计算表明,介孔和氧空位的协同效应显著提高了储能容量。该材料在1.0 A/g条件下达到了384 mAh/g的高容量,循环稳定性在1 A/g和10 A/g条件下分别为6000和60000次。先前报道的锌基电池中从未有过如此高的循环稳定性,且容量也优于大多数此前报道的锌基电池。Open Access(可免费阅读原文)扫描或长按二维码,识别后直达原文页面,或点此查看原文Sustainable Energy & Fuels (IF pending)1. Ammonia borane and hydrazine bis(borane) dehydrogenation mediated by an unsymmetrical (PNN) ruthenium pincer hydride: metal–ligand cooperation for hydrogen productionSustainable Energy Fuels, 2019, Advance Article DOI: 10.1039/C9SE00241CThe authors study a five-coordinate RuII hydride (tBuPNN*)RuH(CO), containing the dearomatized anionic form of the tridendate unsymmetrical pincer ligand tBuPNN as an ammonia borane and hydrazine bis(borane) dehydrogenation catalyst.作者研究了五配位的RuII氢化物(tBuPNN*)RuH(CO),具有不对称三齿钳型配体tBuPNN的去芳香化阴离子形式,可作为氨硼烷和肼双(硼烷)的脱氢催化剂。限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文2. Nature-inspired salt resistant polypyrrole–wood for highly efficient solar steam generationSustainable Energy Fuels, 2019, Advance Article DOI: 10.1039/C9SE00163HFor the first time, a polypyrrole (PPy)–wood device has been prepared through a simple “soak and polymerization” process by in situ polymerization of pyrrole monomers into a three-dimensional (3D) porous wood matrix.本文介绍了一种通过简单的“浸泡和聚合”的方法,将吡咯单体原位聚合成三维(3D)多孔木基质,首次制备了聚吡咯-木器件。限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文Energy & Environmental Science (IF: 30.067)1. Biohybrid photoheterotrophic metabolism for significant enhancement of biological nitrogen fixation in pure microbial culturesEnergy Environ. Sci., 2019, Advance Article DOI: 10.1039/C9EE00705AThe authors induce the coating of biocompatible cadmium sulfide (CdS) nanoparticles (NPs) on the living cell surface of a versatile photoheterotrophic bacterium, Rhodopseudomonas palustris. 作者在一种在多功能光合异养细菌沼泽红假单胞菌(Rhodopseudomonas palustris)的活细胞表面上涂覆生物相容性硫化镉纳米颗粒的方法。限时免费阅读原文,登录后可下载扫描或长按二维码,识别后直达原文页面,或点此查看原文

来源: X-MOL 2019-07-04
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