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  • Microwave-Assisted Thermolysis Route to Single-Step-Preparation of MoS2/CdS Composite Photocatalysts for Active Hydrogen Generation
    Sustainable Energy Fuels Pub Date : 2017-11-20
    Yu-peng Yuan, Lili Jiang, Liangyu Wang, Gengsheng Xu, Lina Gu

    Noble-metal free co-catalysts show great potential for boosting photocatalytic hydrogen generation of a photocatalyt. However, the growth of these co-catalysts is always time and energy intensive due to the multiple operations. Herein we report on facile and rapid growth of MoS2 co-catalyst upon CdS for active hydrogen generation via single-step microwave-assisted thermolysis of Mo/Cd-thiourea complex. The MoS2/CdS hybrids by optimizing microwave reaction time show active H2 generation upon visible light exposure. The highest H2 generation rate achieved was 11.4 mmol h-1 g-1 from the hybrid with 3 wt% MoS2 content, which is 2 times higher that of 0.5 wt% Pt loaded CdS. The present microwave-assisted thermolysis is simple, easily operated, time and energy efficient, thereby providing a robust route for the preparation of metal sulfide-based photocatalysts.

    更新日期:2017-11-20
  • Development of a 3D graphene aerogel and 3D porous graphene/MnO2@polyaniline hybrid film for all-solid-state flexible asymmetric supercapacitors
    Sustainable Energy Fuels Pub Date : 2017-11-20
    Kalyan Ghosh, Chee Yoon Yue, Md Moniruzzaman Sk, Rajeeb Kumar Jena, Shuguang Bi
    更新日期:2017-11-20
  • Silver bismuth iodides in various compositions as potential Pb-free light absorbers for hybrid solar cells
    Sustainable Energy Fuels Pub Date : 2017-11-07
    Ki Woo Jung, Mi Rae Sohn, Hye Min Lee, In Seok Yang, Sang Do Sung, Jeongho Kim, Eric Wei-Guang Diau, Wan In Lee
    更新日期:2017-11-20
  • Dual functions of Zirconium modification on improving the electrochemical performance of Ni-rich LiNi0.8Co0.1Mn0.1O2
    Sustainable Energy Fuels Pub Date : 2017-11-17
    Xing Li, Kang-jia Zhang, Ming-Shan Wang, Yang Liu, Meizhen Qu, Wengao Zhao, Jianming Zheng

    Trace amount of Zirconium (Zr) has been adopted to modify the crystal structure and surface of the Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode material. During cycling at 1.0C, the Zr-modified NCM811 shows an improved capacity retention of 92% after 100 cycles, higher than 75% for pristine NMC811. In addition, the Zr-modified NCM811 is capable of delivering a discharge capacity of 107 mAh g-1 at 10.0C rate, much higher than 28 mAh g-1 delivered by pristine material. These improved electrochemical performances are ascribed to the dual functions of Zr modification. On one hand, part of the Zr enters the crystal lattice, which is beneficial for reducing the Li/Ni cation mixing and enhancing the crystal stability of the cathode. On the other hand, the rest of the Zr forms a 1~2 nm thick coating layer on the surface of the NCM811 cathode, which effectively prevents the direct contact between NCM and the electrolyte, thus suppressing the detrimental interfacial reactions. Therefore, the Zr-modified LiNi0.8Co0.1Mn0.1O2 exhibited significantly enhanced cycling stability and charging/discharging rate capability in comparison with the untreated counterpart.

    更新日期:2017-11-17
  • High cetane renewable diesel fuels prepared from bio-based methyl ketones and diols
    Sustainable Energy Fuels Pub Date : 2017-11-08
    Kale W. Harrison, Benjamin G. Harvey
    更新日期:2017-11-17
  • Bifunctional electrocatalysts for Zn–air batteries
    Sustainable Energy Fuels Pub Date : 2017-11-07
    E. Davari, D. G. Ivey
    更新日期:2017-11-17
  • Creation of Oxygen Vacancy to Activate WO3 for Higher Efficiency Dye-Sensitized Solar Cells
    Sustainable Energy Fuels Pub Date : 2017-11-16
    Hytham Elbohy, Khan Reza, Salem Abdulkarim, Qiquan Qiao

    In this work, oxygen vacancy was created to activate tungsten trioxide (WO3) as a highly efficient counter electrode (CE) in dye-sensitized solar cells (DSSCs). The levels of oxygen vacancies (OVs) in WO3 were finely formed and tuned by doping with different weight percentage (3, 5, and 9 wt%) of urea and annealing in a N2 environment at 470 oC. The urea doped WO3 significantly improved the electrocatalytic behaviour in the iodide-triiodide electrolyte. The effects of OVs on the catalytic performance of WO3 CEs was fully studied and understood. This improvement was attributed to the introduction of OVs into WO3, which acted as surface shallow states to facilitate electron transfer from the WO3 counter electrode to the electrolyte. At a high temperature of 470 oC, urea decomposes into the reactive H2 gas that can remove oxygen atoms from the WO3 surface and create OVs. 5wt% urea was found as the optimal urea concentration that led to the highest catalytic performance as evidenced by the cyclic voltammetry measurements. The 5wt% urea doped WO3 CE-based device achieved a power conversion efficiency (PCE) of ~ 10.5 %, which was improved from the reference Pt CE-based device at ~ 9.3 % and non-active WO3 CE based cell at 3.32%. This has led to the optimal number of OVs that facilitate the charge transfer at the CE/electrolyte interface.

    更新日期:2017-11-17
  • Synthesising chain-like, interconnected Pt nanoparticles using tubular halloysite clay template for efficient counter electrode in dye-sensitised solar cells
    Sustainable Energy Fuels Pub Date : 2017-11-16
    Nagarajan S, Pitchaimuthu Sudhagar, Yong Soo Kang

    We report an inexpensive fabrication route of mesoporous counter electrode, made of chain-like Pt nanoparticles using tubular halloysite clay template. Pre-coated halloysite tube (HT) onto a conducting substrate acts as material synthesising platform for highly interconnected chain-like Pt nanostructure. The Pt-HT composite counter electrode shows effective electrolyte interaction, and high catalytic activity towards tri-iodide reduction. As a result, Pt-HT counter electrode based dye-sensitised solar cells exhibits high energy conversion efficiency of 9.5% than the flat-type Pt film based counter electrode (8.2%) using liquid-type electrolyte.

    更新日期:2017-11-17
  • Revealing how molten salts promote CO2 capture on CaO via an impedance study and sorption kinetics simulation
    Sustainable Energy Fuels Pub Date : 2017-11-08
    Liang Huang, Chunming Xu, Rongzheng Ren, Qianwen Zheng, Zhenhua Wang, Benoît Louis, Qiang Wang
    更新日期:2017-11-16
  • Calcium containing iron oxide as an efficient and robust catalyst in (photo-)electrocatalytic water oxidation at neutral pH
    Sustainable Energy Fuels Pub Date : 2017-11-02
    Hung-Chun Chiu, Wei-Hsiang Huang, Liang-Ching Hsu, Yan-Gu Lin, Yi-Hsuan Lai, Chia-Yu Lin
    更新日期:2017-11-16
  • Bi-functional composite electrocatalysts consisting of nanoscale (La, Ca) oxides and carbon nanotubes for long-term zinc–air fuel cells and rechargeable batteries
    Sustainable Energy Fuels Pub Date : 2017-11-06
    Nengneng Xu, Qi Nie, Yanan Wei, He Xu, Yu-Dong Wang, Xiao-Dong Zhou, Jinli Qiao
    更新日期:2017-11-15
  • SnO2 nanorods encapsulated within a 3D interconnected graphene network architecture as high-performance lithium-ion battery anodes
    Sustainable Energy Fuels Pub Date : 2017-11-01
    Hui Xu, Dan Wang, Wei Zhang, Jianfeng Zhu, Tong Zhang, Xinli Guo, Yao Zhang, Zhengming Sun, Jian Chen
    更新日期:2017-11-15
  • Carbon onion/sulfur hybrid cathodes via inverse vulcanization for lithium–sulfur batteries
    Sustainable Energy Fuels Pub Date : 2017-10-31
    Soumyadip Choudhury, Pattarachai Srimuk, Kumar Raju, Aura Tolosa, Simon Fleischmann, Marco Zeiger, Kenneth I. Ozoemena, Lars Borchardt, Volker Presser
    更新日期:2017-11-15
  • Mechanical activation in reduced graphite oxide/boron nitride nanocomposite electrocatalysts for significant improvement in dioxygen reduction
    Sustainable Energy Fuels Pub Date : 2017-11-02
    Indrajit M. Patil, Chamundi P. Jijil, Moorthi Lokanathan, Anita Swami, Bhalchandra Kakade
    更新日期:2017-11-13
  • Imidazolium-based ionic liquid decorated zinc porphyrin catalyst for converting CO2 into five-membered heterocyclic molecules
    Sustainable Energy Fuels Pub Date : 2017-10-31
    Yaju Chen, Rongchang Luo, Zhi Yang, Xiantai Zhou, Hongbing Ji
    更新日期:2017-11-13
  • New insights into evaluating catalyst activity and stability for oxygen evolution reactions in alkaline media
    Sustainable Energy Fuels Pub Date : 2017-10-27
    Guangfu Li, Lawrence Anderson, Yanan Chen, Mu Pan, Po-Ya Abel Chuang
    更新日期:2017-11-13
  • Nitrogen-doped porous carbons derived from natural polysaccharide for multiple energy storage
    Sustainable Energy Fuels Pub Date : 2017-11-09
    Yongpeng Cui, Huanlei Wang, Xiaonan Xu, Yan Lv, Jing Shi, Wei Liu, Shougang Chen, Xin Wang

    Designing advanced carbon electrodes have been considered as one of the most promising directions. Here, we report a facile approach to produce porous carbon materials. The nanocarbons are prepared with KOH activation by using natural polysaccharide-sodium alginate as the precursor, while further introduction of nitrogen heteroatoms is achieved by the addition of urea. The optimal electrode with a high specific surface area (up to 3313 m2 g-1), interconnected porosity, and rich nitrogen (~7.2 wt%) and oxygen (~7.4 wt%) doping can achieve an excellent electrochemical performance for supercapacitors and lithium ion batteries. Employed for supercapacitor electrodes, an outstanding specific capacitance of 267 F g-1 at 1 A g-1 and an extremely high rate performance with 76.8% capacitance retention ratio can be obtained in alkaline electrolyte, while a high capacitance of 197 F g-1 at 0.5 A g-1 with a high capacitance retention ratio of 52.9% at 100 A g-1 can be received in ionic liquid electrolyte. When tested as lithium ion battery anodes, an extraordinarily high specific capacity of 1455 mA h g-1 and a stable energy storage performance up to 500 cycles have been observed. The present work highlights that high-performance carbon electrodes can be produced by using sustainable precursor for multiple energy storage.

    更新日期:2017-11-09
  • Repurposing Paper By-Product Lignosulfonate as Sulfur Donor/Acceptor for High Performance Lithium-Sulfur Batteries
    Sustainable Energy Fuels Pub Date : 2017-11-09
    Lu Li, Liping Huang, Robert J. Linhardt, Nikhil Koratkar, Trevor J Simmons

    Recovery and repurposing of biomass are critically important and make a significant contribution to environmental preservation. Lignosulfonate, a by-product of the paper manufacturing industry, is an abundant low cost material with unique potential as a sulfur precursor for high performance cathode materials. In this work, we develop a practical green method of using lignosulfonate as both the donor (decomposition of sulfonic groups (-SO3H)) of sulfur and the sulfur acceptor in lignosulfonate derived activated carbon. Through a circulatory pyrolysis process with carbon activation and sulfur capture, a high surface area carbon/sulfur composite was obtained. This material was successfully developed into a cathode for a lithium-sulfur battery, which demonstrates outstanding cycling stability with capacity decay rate as low as 0.1% per cycle over 200 cycles. When the sulfur loading was further increased to 68 wt%, the capacity still reaches as high as 1100 mA h g−1, suggesting its promising potential for applications in the field of high energy storage devices.

    更新日期:2017-11-09
  • High-performance Flexible Redox Supercapacitors Induced by Methylene Blue with a Wide Voltage Window
    Sustainable Energy Fuels Pub Date : 2017-11-09
    Chunmei Xu, Haiyan Wang, Jiang Deng, Yong Wang

    Flexible Redox supercapacitors based on treated carbon cloths were prepared by introducing methylene blue to gel electrolyte. With the improvement of pseudocapacitance and broadening the voltage window, the device exhibited a high capacitance of 1738 mF cm-2 and an energy density of 0.78 mW h cm-2. Besides, 84.6 % capacitance retention was achieved over 8000 cycles.

    更新日期:2017-11-09
  • A hybrid catalyst of Pt/CoNiO2 on carbon nanotubes and its synergetic effect towards remarkable ethanol electro-oxidation in alkaline media
    Sustainable Energy Fuels Pub Date : 2017-10-25
    Tingting Tang, Qiuping Gan, Xiaohui Guo, Hailin Dong, Jifang Zhang, Yanchun Zhao, Jianniao Tian, Xiulin Yang
    更新日期:2017-11-09
  • Continuous silicon oxycarbide fiber mats with tin nanoparticles as a high capacity anode for lithium-ion batteries
    Sustainable Energy Fuels Pub Date : 2017-10-23
    Aura Tolosa, Mathias Widmaier, Benjamin Krüner, John M. Griffin, Volker Presser
    更新日期:2017-11-09
  • High Cetane Renewable Diesel Fuels Prepared from Bio-Based Methyl Ketones and Diols
    Sustainable Energy Fuels Pub Date : 2017-11-08
    Kale Harrison, Benjamin Grant Harvey

    A new class of renewable diesel fuels has been synthesized by acid catalyzed condensation of 2-tridecanone with a series of diols that can be generated from biomass. These fuels exhibit comparable net heats of combustion (NHOCs) to conventional biodiesel, while maintaining derived cetane numbers between 82-91, values which are 20-30 units higher than conventional biodiesel and 40-50 units higher than petroleum-derived diesel fuel. The short combustion delays of the dioxolane fuels make them compelling blendstocks to enhance the combustion efficiency of petroleum-derived diesel fuel by increasing the cetane number and oxygen content of the blends. In addition, careful selection of the renewable diol allows for custom tailoring of viscosity and freezing point. Unlike conventional biodiesel which is often generated from plant or animal derived triglycerides, 2-tridecanone and other methyl ketones, along with the diols, can be efficiently generated from biomass sugars or CO2/H2 via fermentation with metabolically engineered microorganisms. This biosynthetic approach may allow for the generation of these fuels on industrial relevant scales while eliminating competition with food sources and promoting responsible use of land resources.

    更新日期:2017-11-08
  • Revealing how molten salts promote CO2 capture on CaO via impedance study and sorption kinetics simulation
    Sustainable Energy Fuels Pub Date : 2017-11-08
    Liang Huang, chunming Xu, Rongzheng Ren, Qianwen Zheng, Zhenhua Wang, Benoit Louis, Qiang Wang

    Electrochemical impedance spectroscopy analyses were utilised to explore the oxygen ion conductivity of alkali metal salts promoted CaO, which revealed that oxysalts such as carbonate and sulfate with good ion conductivity promote CO2 capture.

    更新日期:2017-11-08
  • Evaluating spinel ferrites MFe2O4 (M = Cu, Mg, Zn) as photoanodes for solar water oxidation: prospects and limitations
    Sustainable Energy Fuels Pub Date : 2017-10-31
    N. Guijarro, P. Bornoz, M. Prévot, X. Yu, X. Zhu, M. Johnson, X. Jeanbourquin, F. Le Formal, K. Sivula
    更新日期:2017-11-08
  • Tailoring oxygen redox reactions in ionic liquid based Li/O2 batteries by means of the Li+ dopant concentration
    Sustainable Energy Fuels Pub Date : 2017-10-25
    Laura Cecchetto, Alvaro Y. Tesio, Mara Olivares-Marín, Marc Guardiola Espinasa, Fausto Croce, Dino Tonti
    更新日期:2017-11-08
  • Energy efficiency: a critically important but neglected factor in battery research
    Sustainable Energy Fuels Pub Date : 2017-10-23
    Ali Eftekhari
    更新日期:2017-11-08
  • High performance fiber-shaped perovskite solar cells based on lead acetate precursor
    Sustainable Energy Fuels Pub Date : 2017-10-23
    Hsienwei Hu, Bin Dong, Buxin Chen, Xue Gao, Dechun Zou
    更新日期:2017-11-08
  • A wet-chemical route for macroporous inverse opal Ge anodes for lithium ion batteries with high capacity retention
    Sustainable Energy Fuels Pub Date : 2017-10-23
    Sebastian Geier, Roland Jung, Kristina Peters, Hubert A. Gasteiger, Dina Fattakhova-Rohlfing, Thomas F. Fässler
    更新日期:2017-11-08
  • A Detailed Evaluation of Charge Recombination Dynamics in Dye Solar Cells Based on Starburst Triphenylamine Dyes
    Sustainable Energy Fuels Pub Date : 2017-11-07
    Manikkedath V Vinayak, Muhammed Yoosuf, Sourava Chandra Pradhan, Thyagarajan M Lakshmykanth, Suraj Soman, Karical Raman R. Gopidas

    Understanding the charge transfer dynamics in dye solar cells (DSCs) is imperative for the development of highly efficient devices. The loss in photocurrent due to recombination can be alleviated by removing holes formed in the oxidized dye molecules away from TiO2 surface and also by preventing the approach of the oxidized species in the electrolyte coming near to the semiconductor. Focusing on elucidating these two parameters we fabricated I-/I3- electrolyte based dye solar cells with two novel branched propeller shaped triphenylamine dyes TPAA4 and TPAA5 with broader absorption and higher molar extinction coefficient, which showed power conversion efficiencies of 6.52% and 4.60% respectively. The bulkiness of the co-donor along with the triple bond bridges provided further rigidity to the structure, thereby reducing aggregation of the dyes on the TiO2 surface. Both the dyes were structurally engineered in such a way to avoid the recombination of electrons from TiO2. Detailed charge transfer dynamics of the devices were studied by employing extensive perturbation techniques such as electrochemical impedance spectroscopy (EIS), charge extraction (CE) and intensity-modulated photovoltage spectroscopy (IMVS).

    更新日期:2017-11-08
  • Silver bismuth iodides in various compositions as potential Pb-free light absorber for hybrid solar cells
    Sustainable Energy Fuels Pub Date : 2017-11-07
    Ki Woo Jung, Mi Rae Sohn, Hye Min Lee, In Seok Yang, Sang Do Sung, Jeongho Kim, Eric Wei-Guang Diau, Wan In Lee

    Polycrystalline silver bismuth iodide (SBI) powders of various compositions (Ag:Bi = 2:1–1:1 in atomic ratio) were synthesized via a solid-state reaction in an evacuated Pyrex tube. Regardless of the composition of Ag and Bi, Ag2BiI5 in the hexagonal phase was preferentially formed and BiI3 impurity in the rhombohedral phase was formed with the increase of the Bi component. The synthesized SBI powders of various compositions were applied as light absorber of the hybrid solar cell (HSC), which employs mesoporous TiO2 as electron transporting layer and pristine spiro-OMETAD as hole transporting layer. To deposit light absorber layers, the coating solutions were prepared by dissolving the synthesized SBI powders in DMSO/DMF/HI and spin-coated over the mesoporous TiO2 layer. For the solar cell employing pure Ag2BiI5, photovoltaic conversion efficiency (PCE) of 1.74% was achieved, whereas the inclusion of the BiI3 impurities in the Ag2BiI5 phase significantly increased the device performance. The highest PCE of 2.31% was achieved with the SBI of Ag:Bi = 55:45. Furthermore, the SBI solar cells show no hysteresis in the J-V curve measurements, and are highly stable at ambient conditions, exhibiting excellent long-term stability under relative humidity of 50%.

    更新日期:2017-11-08
  • Bifunctional Electrocatalysts for Zn-air Batteries
    Sustainable Energy Fuels Pub Date : 2017-11-07
    Elaheh Davari, Douglas Ivey

    Rechargeable metal-air batteries have recently attracted significant attention because of their high theoretical energy output and low cost. Among metal-air batteries, Zn-air batteries (ZABs) have garnered renewed interest as one of the most viable future options to power energy grids and electric vehicles. However, the slow oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) kinetics represent a limiting factor for the energy conversion efficiency of state-of-the-art ZABs. The focus of this review is the latest advances related to the development of non-precious metal catalysts. Four groups of bifunctional catalysts used in primary/secondary ZABs are reviewed. These include transition metal oxides (single/mixed-metal oxides, spinels and perovskites), transition metals, carbon-based materials and precious metals/alloys. ZAB electrochemistry and challenges originating from individual components of the system, such as the Zn electrodes, electrolytes and separators, are also outlined. In addition, the design and architecture of the air-electrode are discussed for future development of ZABs.

    更新日期:2017-11-07
  • Facile synthesis of electrocatalytically active NbS2 nanoflakes for enhanced hydrogen evolution reaction (HER)
    Sustainable Energy Fuels Pub Date : 2017-11-06
    Deepesh Gopalakrishnan, Andrew Lee, Thangavel Nareshkumar, Leela Mohana Reddy Arava

    We report a simple ambient pressure annealing technique for the synthesis of ultrathin niobium disulfide (NbS2) nanoflakes. The structure, morphology and composition of the as synthesized NbS2 flakes are well-characterized using different microscopic and spectroscopic techniques. The synthesized two-dimensional layered NbS2 was in stoichiometric proportion, and has a single crystal 3R-NbS2 polymorph structure with semiconducting behavior and have abundant catalytic defective sites. In this paper, the hydrogen evolution reaction (HER) activity of NbS2 nanoflakes/ rGO composite having dense exposed basal planes with the improved conductivity is explored and found to be a good HER catalyst in terms of low onset potential, high exchange current density, and low Tafel slope.

    更新日期:2017-11-06
  • Bi-functional composite electrocatalysts consisting of nanoscale (La, Ca) oxides and carbon nanotubes for long-term zinc-air fuel cell and rechargeable battery
    Sustainable Energy Fuels Pub Date : 2017-11-06
    Nengneng Xu, Qi Nie, Yanan Wei, He Xu, Yu-Dong Wang, Xiao-Dong Zhou, Jinli Qiao

    Here, we report a new nanocomposite based on (La, Ca) oxides, which exhibits a superior bi-functional activity and durability in a zinc-air battery with an everlasting discharge peak power density reaching to long life test (750 cycles). This work opens a new avenue for design/fabrication of durable bi-functional electrocatalyst for scaleable applications in zinc-air battery.

    更新日期:2017-11-06
  • Sustainable production of medium chain fatty acids (MCFA) with enriched mixed bacterial culture: microbial characterization using molecular methods
    Sustainable Energy Fuels Pub Date : 2017-11-06
    M Venkateswar Reddy, S Venkata Mohan, Young-Cheol Chang

    Chain elongation is the process where bacteria convert ethanol and short chain fatty acids (SCFA) into medium chain fatty acids (MCFA). In the present study, bacterial mixed culture was enriched, and using this enriched culture and synthetic waste (SW) commercially valuable SCFA and MCFA were produced for 91 days under anaerobic fermentation. For the first time, effect of substrate, electron donor, and methane inhibition on MCFA production was evaluated. Produced SCFA, MCFA and biogas were analysed using chromatography techniques. Butyrate (C4), and caproate (C6) were the dominant products in SCFA and MCFA respectively. Bacteria with methane inhibition condition showed highest concentration of butyrate (8.2 g/l), caproate (8.6 g/l), heptanoate (0.7 g/l), and caprylate (0.23 g/l). Dominance of Clostridia, Rumen bacterium, and Actinomyces group in the enriched culture are identified by denaturing gradient gel electrophoresis (DGGE) analysis. Studies were under pipeline with enriched culture to produce SCFA and MCFA using the real waste streams.

    更新日期:2017-11-06
  • Panchromatic absorption of dye sensitized solar cells by co-Sensitization of triple organic dyes
    Sustainable Energy Fuels Pub Date : 2017-10-18
    Ashraful Islam, Towhid H. Chowdhury, Chuanjiang Qin, Liyuan Han, Jae-Joon Lee, Idriss M. Bedja, Md Akhtaruzzaman, Kamaruzzaman Sopian, Antoine Mirloup, Nicolas Leclerc
    更新日期:2017-11-06
  • Organic thermoelectric devices based on a stable n-type nanocomposite printed on paper
    Sustainable Energy Fuels Pub Date : 2017-10-05
    Salim Ferhat, Christophe Domain, Julien Vidal, Didier Noël, Bernard Ratier, Bruno Lucas
    更新日期:2017-11-03
  • Mechanical Activation in Reduced Graphite Oxide/Boron Nitride Nanocomposite Electrocatalyst for Significant Improvement in Dioxygen Reduction
    Sustainable Energy Fuels Pub Date : 2017-11-02
    Indrajit Patil, Chamundi Parambath Jijil, Moorthi Loganathan, Anita Swami , Bhalchandra Anand Kakade

    The nanocomposite of reduced graphite oxide (rGO) with hexagonal boron nitride (h-BN) is prepared using a simple hydrothermal method. Significant enhancement in surface area of composite is mainly due to the pre-mechanical activation of pristine GO. The structural and morphological study reveals the formation of a homogeneous nanocomposite and masking of rGO sheets over a micron sized h-BN particles respectively. Interestingly, the as-synthesized GOBN2-BM composite (nanocomposite of 2 wt% h-BN with mechanically activated GO) catalyst exhibits significant oxygen electroreduction kinetics in terms of onset potential (Eonset = 0.89 V), half-wave potential (E1/2 = 0.74 V) and limiting current density (JL = 4.4 mA cm-2) with a single step ~4-electron transfer pathway in alkaline medium. Though the composite catalysts exhibit higher overpotential (110 mV) than state-of-the-art Pt/C catalyst, it is much superior to previously reported carbon or h-BN based nanocomposite electrocatalysts. Importantly, the GOBN2-BM nanocomposite shows excellent tolerance towards both methanol oxidation and CO poisoning. Moreover, the nanocomposite catalysts show substantially higher stability than Pt/C catalysts even after 5000 cycles under similar conditions. Additionally, it shows a better relative current stability (95% retention) than that of Pt/C catalyst, signifying immense selectivity and durability towards oxygen electroreduction kinetics. The electrocatalytic oxygen reduction activity of nanocomposite is mainly attributed due to the high surface area (thank to mechanical activation of GO, leading to increased pore distribution) as well as synergistic mechanism between the h-BN and carbon network of rGO. Hence, it could be a potential cathode catalyst to replace precious-metal based catalysts in alkaline fuel cell.

    更新日期:2017-11-03
  • Calcium containing iron oxide as an efficient and robust catalyst in (photo-)electrocatalytic water oxidation at neutral pH
    Sustainable Energy Fuels Pub Date : 2017-11-02
    Hung-Chun Chiu, Wei-Hsiang Huang, Liang-Ching Hsu, Yan-Gu Lin, Yi-Hsuan Lai, Chia-Yu Lin

    We report on calcium containing iron oxide thin film (CaFeOx), prepared by spin-coating and follow-up annealing process at mild condition, as an efficient and robust catalyst in electrocatalytic and photoelectrocatalytic water oxidation at neutral pH. Thin film prepared without calcium is essentially crystalline γ-Fe2O3, but those prepared with calcium are amorphous, and with optimal calcium content, resultant film consists of short-range order γ-Fe2O3 domain embedded in amorphous Ca2Fe2O5 matrix. CaFeOx prepared with optimal calcium content decomposes upon exposure to phosphate, resulting in the leaching of surface calcium and formation of redox-active iron phosphate, which prevents the loss of active iron species from etching by protons released from water oxidation process. The amorphous nature and in-situ formation of iron phosphate render CaFeOx higher activity and stability than Co-phosphate, a state-of-art Earth-abundant OEC in neutral aqueous media, under high turnover conditions, reaching 10 mA cm-2 at an overpotential (η) of ~650 mV with a small increase in η (~30 mV) over the 2-h electrolysis in phosphate buffer (1.0 M, pH 7). When being integrated onto a BiVO4 photoanode, CaFeOx greatly improves the kinetics of OER and interfacial hole transfer at BiVO4, resulting in remarkable enhancement in its photocurrent response and photostability.

    更新日期:2017-11-03
  • Hydrogenation of 5-hydroxymethylfurfural to 2,5 dimethylfuran over nickel supported tungsten oxide nanostructured catalyst
    Sustainable Energy Fuels Pub Date : 2017-10-16
    Nazia Siddiqui, Anupam Singha Roy, Reena Goyal, Rubina Khatun, Chandrashekar Pendem, Appala Naidu Chokkapu, Ankur Bordoloi, Rajaram Bal
    更新日期:2017-11-02
  • A comprehensive optimization study on Bi2Te3-based thermoelectric generators using the Taguchi method
    Sustainable Energy Fuels Pub Date : 2017-11-01
    Ravi Anant Kishore, Prashant Kumar, Shashank Priya
    更新日期:2017-11-01
  • SnO2 Nanorods Encapsulated within 3D Interconnected Graphene Network Architecture as High-Performance Lithium-Ion Battery Anodes
    Sustainable Energy Fuels Pub Date : 2017-11-01
    Hui Xu, Dan Wang, Wei Zhang, Jianfeng Zhu, Tong Zhang, Xinli Guo, Yao Zhang, Zhengming Sun, Jian Chen

    SnO2 nanorods (NRs) have been demonstrated as one of potential candidates for high-performance lithium-ion battery anodes due to the unique structure features, high theoretical capacity, natural abundance and low cost of fabrication. However, they still suffer the problem that direct exposure to the electrolyte leads to the instability of SEI layer, causing low Coulombic efficiency, high ionic resistance and low electronic conductivity. In this study, SnO2 NRs were synthesized by a hydrothermal method, and then spatially confined within graphene sheets by a facile freeze-drying process. The as-fabricated architecture exhibits a full encapsulation arrangement with graphene sheets interlaced into an interconnected macroporous network, serving not only as a robust framework with accessible space for electrolyte but also a physical barrier layer to prevent the SnO2 NRs from direct exposure to the electrolyte. In return, the SnO2 NRs can function as pillars to prevent the graphene sheets from restacking while preserving the highly robust structure and efficient electron and ion transport channels. Benefiting from the admirable synergistic effect between SnO2 NRs and graphene, the assembled electrode shows excellent cycle performance (1179.2 mA h g−1 remaining after 400 cycles at 1.0 A g−1) and rate capability (624.2 mA h g−1 at 8.0 A g−1; 458.4 mA h g−1 at 16.0 A g−1).

    更新日期:2017-11-01
  • Solvent selection and design for CO2 capture – how we might have been missing the point
    Sustainable Energy Fuels Pub Date : 2017-11-01
    Maria T. Mota-Martinez, Jason P. Hallett, Niall Mac Dowell
    更新日期:2017-11-01
  • Fe–N co-decorated hierarchically porous graphene as a highly efficient electrocatalyst for the oxygen reduction reaction
    Sustainable Energy Fuels Pub Date : 2017-10-24
    Jianyu Cao, Xiaodi Jia, Mengwei Guo, Yingying Du, Juan Xu, Zhidong Chen
    更新日期:2017-11-01
  • Efficient hypochlorous acid (HClO) production via photoelectrochemical solar energy conversion using a BiVO4-based photoanode
    Sustainable Energy Fuels Pub Date : 2017-10-11
    Shoji Iguchi, Yugo Miseki, Kazuhiro Sayama
    更新日期:2017-11-01
  • Carbon onion / sulfur hybrid cathodes via inverse vulcanization for lithium sulfur batteries
    Sustainable Energy Fuels Pub Date : 2017-10-31
    Soumyadip Choudhury, Pattarachai Srimuk, Kumar Raju, Aura Tolosa, Simon Fleischmann, Marco Zeiger, Kenneth Ikechukwu Ozoemena, Lars Borchardt, Volker Presser

    A sulfur-1,3-diisopropenylbenzene copolymer was synthesized by ring-opening radical polymerization and hybridized with carbon onions at different loading levels. The carbon onion mixing was assisted by shear in a two-roll mill to capitalize on the softened state of the copolymer. The sulfur copolymer and the hybrids were thoroughly characterized in structure and chemical composition, and finally tested by electrochemical benchmarking. A large enhancement of specific capacity was observed up to 140 cycles at higher content of carbon onions in the hybrid electrodes. The copolymer hybrids demonstrate maximum initial specific capacity of 1150 mAh∙g-1sulfur (850 mAh∙g-1electrode) and a low decay of capacity to reach 790 mAh∙g-1sulfur (585 mAh∙g-1electrode) after 140 charge/discharge cycles. All carbon onion / sulfur copolymer hybrid electrodes yielded high chemical stability, stable electrochemical performance superior to a conventional melt-infiltrated reference samples having similar sulfur and carbon onion content. The amount of carbon onions embedded in the sulfur copolymer has a strong influence on the specific capacity, as they effectively stabilize the sulfur copolymer and sterically hindered recombination of sulfur species to S8 configuration.

    更新日期:2017-11-01
  • Evaluating spinel ferrites MFe2O4 (M = Cu, Mg, Zn) as photoanodes for solar water oxidation: prospects and limitations
    Sustainable Energy Fuels Pub Date : 2017-10-31
    Néstor Guijarro, Pauline Bornoz, Mathieu S Prévot, Xiaoyun Yu, Xiaodi Zhu, Melissa Johnson, Xavier A. Jeanbourquin, Florian Le Formal, Kevin Sivula

    The search for ideal semiconductors for photoelectrochemical solar fuel conversion has recently recognized the spinel ferrites as promising candidates due to their optoelectronic tunability together with superb chemical stability. However, a systematic understanding of the main material factors limiting their performance is currently lacking. Herein, nanostructured thin-film electrodes of three representative spinels, namely CuFe2O4 (CFO), MgFe2O4 (MFO) and ZnFe2O4 (ZFO), are prepared by a solution-based approach and their photoelectrochemical (PEC) properties are comprehensively characterized. Annealing post-treatments together with the deposition of NiFeOx overlayers are found to improve the native n-type response, although a dominant bulk recombination (especially in MFO) limits the saturation photocurrents (below 0.4 mA cm-2 at 1.23 V vs RHE). Likewise, prominent Fermi level pinning due to surface states at around 0.9 V vs RHE in all cases appears to limit the photovoltage (to ca. 300 mV). Rapid-scan voltammetry is used to gain insight into the surface states and the operation of the overlayer. Interestingly, the NiFeOx is ineffective at mitigating Fermi level pinning, but clearly participates as an electrocatalyst to improve the overall performance. Generally, these results evidence the potential and current intrinsic limitations of the spinel ferrites—establishing a roadmap for the optimization of these materials as photoanodes for solar water oxidation.

    更新日期:2017-10-31
  • Imidazolium-based ionic liquids decorated zinc porphyrin catalyst for converting CO2 into five-membered heterocyclic molecules
    Sustainable Energy Fuels Pub Date : 2017-10-31
    Yaju Chen, Rongchang Luo, Zhi Yang, Xiantai Zhou, Hongbing Ji

    Imidazolium-based ionic liquids (ILs) functionalized zinc porphyrin catalyst was successfully synthesized for the first time, which was employed as an efficient catalyst for CO2 transformation including both the chemoselective synthesis of cyclic carbonates from various epoxides and the regionselective synthesis of 5-aryl-2-oxazolidinones from N-substituted aziridines. Detailed studies demonstrated that the intramolecularly cooperative effect between the coordinated zinc center (electrophile) and flexible bromine anions (nucleophile) could mediate these reactions effectively under solvent-free and mild conditions. More importantly, the IL-based catalyst could be readily recovered by solvent precipitation and reused with retention of high activity and selectivity for more than ten times based on the concept of “one-phase catalysis coupling with two-phase seperation”.

    更新日期:2017-10-31
  • Highly thermally conductive graphene-based electrodes for supercapacitors with excellent heat dissipation ability
    Sustainable Energy Fuels Pub Date : 2017-10-20
    Bo Zhao, Xian-Zhu Fu, Rong Sun, Ching-Ping Wong
    更新日期:2017-10-31
  • Higher efficiency perovskite solar cells using additives of LiI, LiTFSI and BMImI in the PbI2 precursor
    Sustainable Energy Fuels Pub Date : 2017-10-03
    Sally Mabrouk, Behzad Bahrami, Ashim Gurung, Khan Mamun Reza, Nirmal Adhikari, Ashish Dubey, Rajesh Pathak, Shangfeng Yang, Qiquan Qiao
    更新日期:2017-10-31
  • New insights into evaluating catalyst activity and stability of oxygen evolution reactions in alkaline media
    Sustainable Energy Fuels Pub Date : 2017-10-27
    Guangfu Li, Lawrence Anderson, Yanan Chen, Mu Pan, Po-Ya Abel Chuang

    The growing development of oxygen-evolution-reaction (OER) catalysts has increased the demand for robust evaluation protocols to identify promising candidates. In this work, we successfully establish an effective experimental protocol to quantify the intrinsic performance of OER catalysts in a standard thin-film rotating-(ring)-disk-electrode system. Meanwhile, a new insight into electric double layer (EDL) microstructure is gained to illustrate all experimental observations in alkaline media. The results indicate that IrO2 has 2.6-times higher activity than NiCo2O4, ascribing to the improved reaction kinetics, charge transfer and O2-transport occurring in EDL. However, after 10,000 cycles of cyclic voltammetry (CV), NiCo2O4 shows much higher stability due to continuous EDL structural modifications. In particular, it is revealed that the EDL charging process, accompanied by electrocatalytic OER, has a strong effect on catalyst-electrolyte interfacial behaviors, which in turn, determines the accuracy of electrochemical measurement results. It is further found that the electrochemical surface area (ECSA) obtained from traditional CV measured capacitance cannot accurately reflect the actual reaction sites of various catalysts during OER. This discrepancy exists mainly because of the EDL capacitance, which is referred to as inner capacitance caused by less accessible active sites. Alternatively, a novel method based on in-situ electrochemical impedance spectroscopy has demonstrated the improved accuracy in obtaining potential-dependent ECSA, comparable to ex-situ Brunauer-Emmett-Teller surface area measurements.

    更新日期:2017-10-27
  • Activation of a particulate Ta3N5 water-oxidation photoanode with a GaN hole-blocking layer
    Sustainable Energy Fuels Pub Date : 2017-10-13
    Yusuke Asakura, Tomohiro Higashi, Hiroshi Nishiyama, Hiroyuki Kobayashi, Mamiko Nakabayashi, Naoya Shibata, Tsutomu Minegishi, Takashi Hisatomi, Masao Katayama, Taro Yamada, Kazunari Domen
    更新日期:2017-10-27
  • Laboratory filter paper as a substrate material for flexible supercapacitors
    Sustainable Energy Fuels Pub Date : 2017-10-06
    Leicong Zhang, Xuecheng Yu, Pengli Zhu, Fengrui Zhou, Gang Li, Rong Sun, Ching-ping Wong
    更新日期:2017-10-26
  • Tailoring oxygen redox reactions in ionic liquid based Li/O2 batteries by mean of the Li+ dopant concentration
    Sustainable Energy Fuels Pub Date : 2017-10-25
    Laura Cecchetto, Alvaro Tesio, Mara Olivares-Marín, Marc Guardiola Espinasa, Fausto Croce, Dino Tonti

    Ionic liquids’ (ILs) reusability, non-volatility and non-corrosiveness, as well as their ease of isolation and a large electrochemical stability window make them an interesting choice as environment-friendly electrolyte for metal/air batteries. ILs have been described as designer solvents as their properties and behaviour can be adjusted to suit an individual reaction need. In the framework of this study we applied a conceptually similar designer approach and show that a simple parameter as the concentration of a Li+ dopant dramatically affects the reactions yields of Li/O2 based energy storage devices. We studied the effect of Li+ concentration from 0.1 to 1 M in a LiTFSI:PYR14TFSI ionic liquid electrolyte on the kinetics of the oxygen reduction reaction (ORR) and on the formation rate of different Li-O species at two different temperatures, finding that discharge capacity, rates and product distribution change in a non-linear way. At 60 °C highest rates and up to one order of magnitude larger capacities were observed at intermediate LiTFSI concentrations, implying a complete mechanism switch from surface to volume phase mediation for Li2O2 precipitation. At room temperature the same evolution was observed, even if in this case the surface mediation remained predominant at all concentrations. These results suggest the possibility to optimise the ionic liquid based Li/O2 battery performances in terms of discharge capacity and lithium use, by playing on temperature and alkali cation concentration.

    更新日期:2017-10-26
  • Hybrid catalyst of Pt/CoNiO2 on carbon nanotubes and its synergetic effect towards remarkable ethanol electro-oxidation in alkaline media
    Sustainable Energy Fuels Pub Date : 2017-10-25
    Tingting Tang, Qiuping Gan, Xiaohui Guo, Hailin Dong, Jifang Zhang, Yanchun Zhao, JN Tian, Xiulin Yang

    Hybrid catalyst of Pt/CoNiO2 on carbon nanotubes (Pt/CoNiO2-CNTs) has been successfully synthesized by a facile and cost-effective method, in which the crystal structures, chemical valence states and morphologies have been detailedly characterized. CO stripping voltammograms reveal that the adsorbed COads on active sites of Pt/CoNiO2-CNTs catalyst is easily oxidized at lower potential (-0.60 V) compared to Pt particles on rGO (-0.35 V) and acid-treated CNTs (-0.36 V). Cyclic voltammograms demonstrate that the designed Pt/CoNiO2-CNTs catalyst possesses ultrahigh electrocatalytic activity for ethanol oxidation (1136.2 mA mg-1 Pt), which are 5.1 and 3.0 times higher than Pt/rGO (221.6 mA mg-1 Pt) and Pt/CNTs (375.4 mA mg-1 Pt), respectively. The Tafel plot of Pt/CoNiO2-CNTs is 205 mV dec-1, indicating much faster reaction kinetics than that of the compared catalysts. In addition, the outstanding long-term stability indicates the designed Pt/CoNiO2-CNTs catalyst has an expected application prospects on direct alkaline ethanol fuel cells. The catalytic mechanism of the hybrid Pt/CoNiO2-CNTs is also proposed and discussed via C2 and C1 pathways with respect to the final products for CH3COO- and CO32-, respectively.

    更新日期:2017-10-26
  • 更新日期:2017-10-26
  • Magnetic energy harvesting with magnetoelectrics: an emerging technology for self-powered autonomous systems
    Sustainable Energy Fuels Pub Date : 2017-10-03
    Venkateswarlu Annapureddy, Haribabu Palneedi, Geon-Tae Hwang, Mahesh Peddigari, Dae-Yong Jeong, Woon-Ha Yoon, Kwang-Ho Kim, Jungho Ryu
    更新日期:2017-10-26
  • Fe-N co-decorated hierarchically porous graphene as a highly efficient electrocatalyst for the oxygen reduction reaction
    Sustainable Energy Fuels Pub Date : 2017-10-24
    Jianyu Cao, Xiaodi Jia, Mengwei Guo, Yingying Du, Juan Xu, Zhidong Chen

    A Fe-N co-decorated hierarchically porous graphene (FeN/G) was prepared by a facile one-step pyrolysis method. In the pyrolysis synthesis process, dicyandiamide was introduced as a nitrogen precursor and sacrificial templating agent, together with ferric nitrate utilized as an iron precursor, to aid in the formation of graphene nanosheets and their self-assembly into an interconnected porous framework. Consequently, the resultant FeN/G framework shows a relatively large specific surface area (401.1 m2 g-1), hierarchically porous structure and abundant meso-/macropores. Such highly desired FeNC structures not only possess sufficient catalytically-active sites for the oxygen reduction reaction (ORR) but also guarantee the fast transfer of reactants and ions, which provides excellent catalytic activity with positive onset and half-wave potentials, large kinetic-limiting current density, and remarkable durability that is obviously better than the commercial Pt/C in alkaline medium.

    更新日期:2017-10-24
  • Extrusion of a nano-ordered active layer for organic photovoltaic cells
    Sustainable Energy Fuels Pub Date : 2017-09-27
    Ali Nourdine, Lionel Flandin, Nicole Albérola, Lara Perrin, Emilie Planès, Anne Hiltner, Eric Baer
    更新日期:2017-10-24
  • Three-dimensional titanium oxide nanoarrays for perovskite photovoltaics: surface engineering for cascade charge extraction and beneficial surface passivation
    Sustainable Energy Fuels Pub Date : 2017-09-22
    Wu-Qiang Wu, Dehong Chen, Yi-Bing Cheng, Rachel A. Caruso
    更新日期:2017-10-24
  • Stabilizing organic photocathodes by low-temperature atomic layer deposition of TiO2
    Sustainable Energy Fuels Pub Date : 2017-09-21
    Ludmilla Steier, Sebastiano Bellani, Hansel Comas Rojas, Linfeng Pan, Mikko Laitinen, Timo Sajavaara, Fabio Di Fonzo, Michael Grätzel, Maria Rosa Antognazza, Matthew T. Mayer
    更新日期:2017-10-24
Some contents have been Reproduced with permission of the American Chemical Society.
Some contents have been Reproduced by permission of The Royal Society of Chemistry.
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