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  • Microscopic dynamics in room-temperature ionic liquids confined in materials for supercapacitor applications
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-15
    Naresh C Osti; Eugene Mamontov

    Performance of electrical double layer capacitors (EDLCs), also known as supercapacitors, which are composed of porous electrodes and ionic liquid electrolytes, depends largely on the structure and dynamics of molecules/ions on the electrode-electrolyte interfaces. Immobilization of ions on electrodes surface and diffusivity of ions in the middle of the pores are two important phenomena influencing performance of supercapacitors. In recent years, porous carbon or metal carbide derived electrodes and ionic liquids electrolytes, either in the neat state, or mixed with organic solvents, were used to improve the energy and power density of supercapacitors. The molecular/ionic level predictive understanding of ions immobilization and movement inside the pores can be achieved, in principle, using molecular dynamics (MD) simulations. This calls for experimental techniques capable of validating MD predictions and providing directions for the future MD studies. Neutron scattering techniques, particularly quasi-elastic neutron scattering (QENS), uniquely provide information directly comparable with MD simulations results. This includes electrolytes confined in the electrode materials, due to high penetrative power of neutrons and their high sensitivity to hydrogen-bearing species. This paper reviews recent research where QENS, together with electrochemical measurements and molecular dynamics simulations, has been employed to explore the complex electrode/electrolyte systems, which is critical for developing predictive understanding of the charge storage mechanism in supercapacitors.

    更新日期:2020-01-15
  • Construction of a nanocavity structure with a carrier-selective layer for enhancement of photocatalytic hydrogen production performance†
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2019-12-14
    Qin Lei; Rongzhi Chen; Jihua Tan; Xinxin Long; Huanyu Chen; Xinming Wang; Jingfu Liu; Zhongfang Lei; Zhenya Zhang
    更新日期:2020-01-15
  • Permselective ion electrosorption of subnanometer pores at high molar strength enables capacitive deionization of saline water†
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2019-12-16
    Sheng Bi; Yuan Zhang; Luca Cervini; Tangming Mo; John M. Griffin; Volker Presser; Guang Feng
    更新日期:2020-01-15
  • Pulsed laser rusted stainless steel: a robust electrode material applied for energy storage and generation applications†
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2019-12-03
    Namachivayam Karthik; Tian Tian; Thomas Nesakumar Jebakumar Immanuel Edison; Raji Atchudan; Yong Rok Lee; Seongbeom Kim; Dangsheng Xiong
    更新日期:2020-01-15
  • PEST (political, environmental, social & technical) analysis of the development of the waste-to-energy anaerobic digestion industry in China as a representative for developing countries
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-14
    Habiba Khalid; Hongyan Zhang; Caiyan Liu; Wei Li; Muhammad Khubaib Abuzar; Farrukh Raza Amin; Guangqing Liu; Chang Chen
    更新日期:2020-01-14
  • Hierarchical CoMoO4 nanoparticles decorated nanoplate array as an electrocatalyst toward boosted alkaline oxygen evolution reaction
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-14
    Xin Guan; Lin Yang; Guilei Zhu; Hao Wen; Jie Zhang; Xun Sun; Hao Feng; Wenli Tian; Xianchun Chen; Yadong Yao

    Highly efficient noble metal-free water oxidation electrocatalysts plays a key role in water splitting devices for large-scale hydrogen production. In this communication, we report the surface engineering of a CoMoO4 nanoplate array on nickel foam (CoMoO4 NPAs/NF) by CoMoO4 nanoparticles decorating. The hierarchical structure of as-formed CoMoO4 NP@PAs/NF (CoMoO4 nanoparticles coated nanoplate array on Ni foam) guarantees the exposing of more catalytic active sites with a much larger electrochemically active surface area, leading to boosted catalytic activity for oxygen evolution reaction (OER) in alkaline media. In 1 M KOH, it needs a low overpotential of 317 mV to attain 100 mA cm–2, 72 mV less than that for CoMoO4 NPAs/NF. Moreover, this system is also durable with a twice higher turnover frequency (TOF) value of 0.41 s-1 at 400 mV overpotential compared with CoMoO4 NPAs/NF.

    更新日期:2020-01-14
  • Cross-Conjugated BODIPY Pigment for Highly Efficient Dye Sensitized Solar Cells
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-14
    Md Faiz Shah; Antoine Mirloup; Towhid Hossain Chowdhury; Alexandra Sutter; Abdulkader S. Hanbazazah; Anas Ahmed; Jae-Joon Lee; M. Abdel-Shakour; Nicolas Leclerc; Ryuji Kaneko; Ashraful Islam

    In this study, we report a new BODIPY-based design, called cross-conjugated design, that takes advantage of the α and β positions functionalization of the BODIPY core. After synthesis, and compared to a more standard BODIPY dye, using similar functional groups and based on a horizontal design, called h-BOD, the new cross-conjugated BODIPY dye (cc-BOD) exhibits clearly the highest conjugation and light harvesting properties. Consequently, when used as photosensitizers in dye-sensitized solar cells (DSSCs), an impressive improvement of power conversion efficiency (PCE) has been observed, with a PCE of 6.02% with broad incident photon to current conversion efficiency (IPCE) for cc-BOD, compared to only 3.7% for h-BOD. Moreover, by co-sensitizing a DSSC with the two complementary absorbing dyes h-BOD and cc-BOD, we further improved the PCE up to 6.2 %. .

    更新日期:2020-01-14
  • Vapor-fed photoelectrolysis of water at 0.3 V using gas-diffusion photoanodes of SrTiO3 layers†
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2019-12-26
    Fumiaki Amano; Hyosuke Mukohara; Hiroki Sato; Chihiro Tateishi; Hiromasa Sato; Toshiki Sugimoto
    更新日期:2020-01-14
  • MoC based Mott–Schottky electrocatalyst for boosting the hydrogen evolution reaction performance†
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2019-11-06
    Xinyang Ji; Kaixuan Wang; Yao Zhang; Haohao Sun; Yuanyuan Zhang; Tiange Ma; Zhuo Ma; PingAn Hu; Yunfeng Qiu
    更新日期:2020-01-14
  • Single step additive manufacturing (3D printing) of electrocatalytic anodes and cathodes for efficient water splitting†
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2019-10-24
    Jack P. Hughes; Pãmyla L. dos Santos; Michael P. Down; Christopher W. Foster; Juliano A. Bonacin; Edmund M. Keefe; Samuel J. Rowley-Neale; Craig E. Banks
    更新日期:2020-01-14
  • An advanced and highly efficient Ce assisted NiFe-LDH electrocatalyst for overall water splitting†
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2019-10-16
    Harsharaj S. Jadhav; Animesh Roy; Bezawit Z. Desalegan; Jeong Gil Seo
    更新日期:2020-01-14
  • A review on silicon-nanowires-based anodes for next-generation high-performance lithium-ion batteries from a material-based perspective
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-13
    Yang Yang; Wei Yuan; Wenquan Kang; Yintong Ye; Qiqi Pan; Xiaoqing Zhang; Yuzhi Ke; Zhiqiang Qiu; Chun Wang; Yong Tang

    Lithium-ion battery (LIB) is an efficient electrochemical energy storage device with high voltage, long life and good safety, etc. Silicon has a high theoretical specific capacity (4200 mAh g−1), which is considered as a promising anode material for the next-generation LIBs. However, the huge volume change (400%) of Si material during lithiation/delithiation processes must destroy the material structure, which greatly reduces the initial coulombic efficiency, cycle stability and rate performance of the battery. Constructing nanostructured Si, especially silicon nanowires (SiNWs), can help to address the above issues. It is important to further improve the electrochemical performance by incorporating some additives to the SiNWs-based electrodes. Therefore, this review focuses primarily on SiNWs-based materials as the anodes for LIBs from a material-based perspective. Various materials incorporated into SiNWs-based anodes through doping or compositing are reported. The electrochemical effects of diverse additives, including carbon materials, metals, metal oxides, polymers, Si-based materials and other special substances, are comprehensively reviewed.

    更新日期:2020-01-13
  • Enhanced photoelectrochemical water-splitting performance of SrNbO2N photoanodes by flux-assisted synthesis method and surface defect management
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-13
    Yingchen Yang; Zirui Lou; Weisheng Lei; Yichen Wang; Rong Liang; Chao Qin; Liping Zhu

    Perovskite SrNbO2N particles were directly synthesized by one-step thermal nitridation method with chloride flux and subsequently annealed under inert Ar flow. By a suitable adjustment of flux synthesis parameters, including nitridation temperature and the composition of molten salt, preferable experimental condition were found to suppress the formation of surface Nb defect, as well as obtaining samples with high crystallinity. The different SrNbO2N photoanodes were fabricated using electrophoretic deposition (EPD) method followed by necking treatment. The SrNbO2N photoanode prepared by optimum experimental condition (nitridation temperature: 850 °C, the molar ratio of flux SrCl2 : KCl = 2:1) exhibits a highest photocurrent density of 2.0 mA·cm-2 at 1.23 VRHE under simulated sunlight (AM 1.5G 100 mW·cm-2) in 1 M NaOH electrolyte. In comparison, the other highly defective SrNbO2N photoanodes shows unsatisfied water oxidation performance, which demonstrates the necessity to reduce the destructive effect of defects in order to achieve higher photocurrent density.

    更新日期:2020-01-13
  • Power-to-gas Systems Utilizing Methanation Reaction in Solid Oxide Electrolysis Cell Cathodes: A Model-based Study
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-13
    Naoya Fujiwara; Shohei Tada; Ryuji Kikuchi

    Power-to-gas is an emerging technology to convert electrical energy into chemical energy, and usually consists of two steps. First, hydrogen or syngas is produced in electrolysis cells, and then the hydrogen is used to methanate COx in catalytic reactors. Solid oxide electrolysis cells (SOECs) have the potential to integrate these two steps because methane can be directly synthesized in the SOEC cathodes. However, the advantages and drawbacks of such a direct process have not been discussed quantitatively. In the present work, we established a model using Aspen Plus to simulate the direct process. By analyzing the energy conversion processes in detail, it was clarified that the suppression of SOEC overpotentials at low temperatures is crucial. If the SOEC overpotentials are decreased at 400oC, the energy conversion efficiency of the direct process will become higher than that of the conventional two-step process especially at small methane production rates. The superior performance can be ascribed to the recuperative heat utilization between the exothermic methanation reaction and the endothermic electrolysis reactions.

    更新日期:2020-01-13
  • Realizing Li7La3Zr2O12 garnet with high Li+ conductivity and dense microstructure by Ga/Nb dual substitution for lithium solid-state battery applications
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-13
    Weijie Lan; Hongyang Fan; Vincent Wing-hei Lau; Jiliang Zhang; Jia-feng Zhang; ruirui zhao; Hongyu Chen

    Li7La3Zr2.0O12 (LLZO) garnet has many properties of a suitable solid electrolyte for lithium ion batteries, however, drawbacks like low ionic conductivity and poor interfacial property still hinder its market broadening. Current research have sought to both increase its ionic conductivity and densify its microstructure, which are two important factors for its practical application. This study presents a facile and effective way to obtain compact LLZO with high Li+ conductivity by a one-step multi-elemental doping strategy using Nb5+ and Ga3+ as dopants simultaneously. Garnet-structured oxides with nominal chemical compositions of Li6.8-3xGaxLa3Zr1.8Nb0.2O12 (x=0, 0.1, 0.15, 0.2, 0.25, 0.3) are prepared via conventional solid-state reaction, and the effects of the two dopants on the oxides are investigated based on their phase composition, morphology and Li ion conductivity. Benefitting from the Li+ vacancy generated by the addition of the two elements, the garnet sintered with optimized Ga/Nb dopant amount can exhibit relative densities of 93~95%, and a peak conductivity of 1.42×10-3 S cm-1 at 50 °C. In a symmetric Li/LLZO/Li cell, this dense structured electrolyte shows low overpotential and superior electrochemical stability to Li metal, exhibiting over 200 h under the current density of 100 μA cm-1 upon Li plating/stripping cycles. Besides, this co-doped solid-state electrolyte can exhibit acceptable cycling stability when paired with LiNi0.33Mn0.33Co0.33O2 (NMC111)) cathode, both with the help of liquid electrolyte and assembled as a all-solid-state battery. We believe this research can provide some new insights in developing solid-state electrolyte based lithium ion batteries.

    更新日期:2020-01-13
  • Chemical looping hydrogen storage and production: Use of binary ferrite-spinel as oxygen carrier materials
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-13
    Min Li; Yu Qiu; Li Ma; Dongxu Cui; Shuai Zhang; Dewang Zeng; Rui Xiao

    Chemical looping hydrogen storage and the recovery by redox of iron oxides were recommended as an emerging approach for large-scale hydrogen storage with a high volumetric hydrogen storage density. However, iron oxides should be operated at a high temperature (>800 °C) for its sufficient redox activity which would lead to a rapid deterioration of hydrogen storage performance over cycles. In this work, a series of ferrite-spinel materials A0.25Fe2.75O4 (A=Co, Cu, Ni, Zn or Mn) were prepared. Among all the additives to iron oxides, Co0.25Fe2.75O4 exhibits the high volumetric hydrogen storage density (~62.47 g·L-1) and average hydrogen production rate (~132 μmol·g-1·min-1) under 550 °C. Besides, the storage capacity maintained over 10 cycles. The volumetric hydrogen storage density of this material was proportionate to the most advanced Rh-FeOx containing rare-earth metal, thus it may have the potential of industry application

    更新日期:2020-01-13
  • Lipase-catalyzed ethanolysis for biodiesel production of untreated palm oil mill effluent†
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-07
    Nova Rachmadona; Jerome Amoah; Emmanuel Quayson; Shinji Hama; Ayumi Yoshida; Akihiko Kondo; Chiaki Ogino
    更新日期:2020-01-13
  • Highly efficient and durable III–V semiconductor-catalyst photocathodes via a transparent protection layer†
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-03
    Shinjae Hwang; James L. Young; Rachel Mow; Anders B. Laursen; Mengjun Li; Hongbin Yang; Philip E. Batson; Martha Greenblatt; Myles A. Steiner; Daniel Friedman; Todd G. Deutsch; Eric Garfunkel; G. Charles Dismukes
    更新日期:2020-01-13
  • From Douglas fir to renewable H2-enriched syngas via ex situ catalytic pyrolysis over metal nanoparticles–nanocellulose derived carbon catalysts†
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2019-12-30
    Yayun Zhang; Dengle Duan; Hanwu Lei; Chenxi Wang; Moriko Qian; Elmar Villota; Wendy Mateo
    更新日期:2020-01-13
  • Life cycle assessment of power-to-gas with biogas as the carbon source†
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2019-12-17
    Xiaojin Zhang; Julia Witte; Tilman Schildhauer; Christian Bauer
    更新日期:2020-01-13
  • Greener aromatic antioxidants for aviation and beyond
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-10
    Dirk Volker Woortman; Sophie Jürgens; Martin Untergehrer; Julia Rechenberger; Monika Fuchs; Farah Qoura; Georg Eckel; Michael Stöhr; Patrick Oßwald; Patrick LeClercq; Lukas Hintermann; Dirk Weuster-Botz; Franz Bracher; Thomas Brück; Norbert Mehlmer

    Antioxidants (AO) inhibiting unspecific oxygen reactions are added to most susceptible industrial products, including liquid hydrocarbon-based aviation fuels. Regulatory approved jet fuel, whether synthetic or crude oil-based, requires the addition of performance antioxidants to inhibit radical-induced oxidation during storage and transport. While presently used antioxidants are petroleum-based, there have been no sustainable, less-toxic, bio-based equivalents reported so far. This study addresses the initial evaluation of carotenoid-based antioxidants as a substitution for current alkyl-phenolic antioxidants to kerosene. Inspired from natural products of Brevibacterium and Synechococcus genus synthesized analogues of candidate aromatic carotenoid cleavage products were evaluated for their effects on combustion characteristics of jet fuel, comparative radical scavenging, and endothelial cell-culture cytotoxicity. These bioinspired antioxidants did show no adverse effect on jet fuel bulk properties and combustion chemistry. The radical scavenging properties of the evaluated phenolic compounds are superior to non-aromatic ß-carotene cleavage products and in range with current alkyl-phenolic additives. Cytological assays demonstrated low toxicity towards human endothelial cells similar to butylated hydroxytoluene (BHT), one of the approved alkyl-phenol based additives to jet fuel, food, and cosmetics. The initial data set suggests, that the evaluated bioinspired compounds do not interfere with normal operations of jet engines and human fuel handling. Further developments towards the sustainable, biotechnological production and application of aromatic carotenoid cleavage products as antioxidants could contribute to reduced non-renewable consumption and possibly being an environmentally more compatible alternative due to their biosynthetic origin.

    更新日期:2020-01-10
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  • A model-based comparison of Ru and Ni catalysts for the Sabatier reaction
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2019-12-26
    Emanuele Moioli; Andreas Züttel
    更新日期:2020-01-10
  • Electrosynthesis of gradient TiO2 nanotubes and rapid screening using scanning photoelectrochemical microscopy†
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2019-12-26
    Florian Gelb; Yu-Chien Chueh; Neso Sojic; Valérie Keller; Dodzi Zigah; Thomas Cottineau
    更新日期:2020-01-10
  • A highly active and stable cathode for oxygen reduction in intermediate-temperature solid oxide fuel cells
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2019-12-18
    Xifeng Ding; Mingze Li; Xinyu Zhao; Liming Ding; Yufei Yan; Lixi Wang; Zhihong Wang
    更新日期:2020-01-10
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  • 更新日期:2020-01-09
  • Branched nanosheets-interlaced structure of high performance Ni(OH)2 derived from the isostructural Ni3(NO3)2(OH)4 to clarify the role of structure self-supporting in cycling stability
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-09
    Jing Wang; Jing Li; Meiri Wang; Yuanyuan Liu; Hongtao Cui

    The battery-type electrode materials such as Ni(OH)2 applied in Faraday supercapacitors could present low cycling stability due to the microstructure damage of materials originating from their cyclic volume swelling and shrinking. It is well established that the structural stability of materials is crucial for their cycling stability. However, the lack of knowledge about the structural relevance of materials to the cycling stability somehow results in the chaotic understanding on the materials design. In this work, we try to reveal the structural relevance by comparing the orderly built nanostructure with the randomly packed nanostructure using Ni(OH)2 as target material. It is found that the branched nanosheets-interlaced nanostructure of Ni(OH)2 has the self-supportive function in favor of its structural stability, which thus promotes its cycling stability. Also, the orderly nanostructured Ni(OH)2 presents high electrochemical performance due to the reduced interfacial charge-transfer resistance and Warburg resistance.

    更新日期:2020-01-09
  • 更新日期:2020-01-09
  • Enhanced cathode performance of Fe2O3, boron nitride-doped rGO nanosheets for microbial fuel cell applications
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-08
    Shanmugam Mahalingam; Sivasankaran Ayyaru ; Youngho Ahn

    Iron (III) oxide (Fe2O3) and boron nitride (BN)-doped reduced graphene oxide (rGO) nanosheets were prepared successfully using a surfactant-free hydrothermal method. Through this method, one-dimensional Fe2O3 nanorods and boron nitride were incorporated into rGO nanosheets. The hybrid nanocomposite (rGO-BN-Fe2O3) was analyzed by X-ray diffraction, field emission scanning electron microscopy, high-resolution transmission electron microscopy (HR-TEM) with selected area electron diffraction, and X-ray photoelectron spectroscopy. HR-TEM revealed the Fe2O3 nanorods to have a mean size of 20-30nm with a uniform distribution distributed over the rGO nanosheets. In this study, the performance of the graphene-based hybrid nanocomposites, rGO-BN-Fe2O3, was assessed using novel cathode catalysts in a single-chamber-air-cathode microbial fuel cell (MFC). MFCs with different catalyst loadings (single layer (SL), double layer (DL), and triple layer (TL) were fabricated. The electrochemical performance of the MFCs was analyzed by cyclic voltammetry and impedance analysis. The MFCs with the rGO-BN-Fe2O3 hybrid nanocomposite cathode showed higher maximum power densities (81%) than the rGO-BN and rGO-Fe2O3 composites. The MFCs with a cathode containing a DL loading of the rGO-BN-Fe2O3 hybrid nanocomposite showed a high power generation of 1673 ±11 mW/m2 and an OCP of 663 ± 4 mW compared to that generated with the other MFC-SL and MFC-TL loadings, respectively. The double-loaded cathode rGO-BN-Fe2O3 hybrid nanocomposite MFCs produced 81% of the predicted power density for Pt/C MFCs, 2066 ±15 mW/m2. Therefore, the considerable increases in power density highlight the potential of the rGO-BN- Fe2O3 hybrid nanocomposite cathode as a material for MFC applications. The double loaded catalyst of the rGO-BN- Fe2O3 hybrid nanocomposite cathode, is a promising, less expensive green material for constant power generation and prolonged operation of MFCs compared to the Platinum on carbon (Pt/C) electrode.

    更新日期:2020-01-08
  • Life cycle assessment of plasma-assisted ethylene production from rich-in-methane gas streams†
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-08
    Evangelos Delikonstantis; Elorri Igos; Michael Augustinus; Enrico Benetto; Georgios D. Stefanidis
    更新日期:2020-01-08
  • Methanol production from CO2 via an integrated, formamide-assisted approach
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-07
    Jorge Gustavo Uranga; Aswin Gopakumar; Tim Pfister; Gunay Imanzade; Loris Lombardo; Gabriela Gastelu; Andreas Züttel; Paul Dyson

    The synthesis of fuels from CO2 has made tremendous progress in recent years, although practical applications remain limited. Herein, we describe a cyclic process that produces MeOH from CO2 via formamide intermediates, which are initially reduced using NaBH4 to form methanol and concomitantly release the corresponding amine, from which the formamide is subsequently regenerated in the presence of CO2/NaBH4. By tuning the substituents on the formamide/amine, the selectivity of both steps can be controlled, allowing the process to proceed in high yields, either in two separate steps or in a single step process. The observed trends in reactivity were rationalized with a resonance model of the formamide, which supports the observed trends in reactivity, and further consolidated by spectroscopy and calculations.

    更新日期:2020-01-07
  • Hierarchical porous carbon derived from eucalyptus-bark as sustainable electrodes for high-performance solid-state supercapacitor
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-07
    Nitish Yadav; Ritu No last name; Promila No last name; S. A. Hashmi

    We report the synthesis and characterization of a novel activated carbon derived from waste eucalyptus bark through chemical and physical activation processes to use as potential electrode for symmetric electrical double layer capacitors (EDLCs). A porous polymer film prepared by simple phase-inversion method and activated by an ionic liquid electrolyte has been used as a flexible, high ion-conducting, mechanically and electrochemically stable electrolyte for the EDLCs. The use of waste eucalyptus bark to produce activated carbon (AC) with a straightforward activation process, and a simple phase-inversion method to produce porous polymer electrolytes (PPEs), make possible the preparation of ecofriendly, safe, and flexible EDLCs. The derived AC powder, possesses a hierarchical porous interior having micro- and meso-porosity. EDLC, constructed using the optimized AC, shows high specific capacitance of 155 F g-1, and offers better rate capability than commercial AC-based device. EIS studies reveal superior charge-transfer characteristics of optimized AC electrodes, as compared to the commercial AC. Galvanostatic charge-discharge measurements highlight the high specific energy and maximum power (32.8 Wh kg-1 and 57 kW kg-1, respectively) of the optimized AC based EDLC. This device maintains its performance for at least 10,000 charge-discharge cycles with high (96%) capacitance retention.

    更新日期:2020-01-07
  • Titanate Nanotubes Confined Merger of Organic Photocatalysis and TEMPO Catalysis for Highly Selective Aerobic Oxidation of Sulfides
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-07
    Xiaoming Ma; Xianjun Lang

    1D titanate (H2Ti3O7) nanotubes were prepared by hydrothermal method of treatment of TiO2 under 10 M NaOH and ensuing acid treatment. Here, it was discovered that H2Ti3O7 nanotubes can facilitate the merger of organic photocatalysis and TEMPO catalysis. Confined within H2Ti3O7 nanotubes, organic photocatalyst erythrosin B (ErB) could drive highly selective aerobic oxidation of sulfides under irradiation of green light-emitting diodes (LEDs), when 0.5 mol% of TEMPO was added as co-catalyst. The turnover number (TON) for selective aerobic oxidation of thioanisole in terms of ErB is 2352, which is hitherto the best record of TON. Apart from confining the successful merger of ErB photocatalysis and TEMPO catalysis, H2Ti3O7 nanotubes not only activate inert O2 to generate superoxide radical anion (O2•-), but also ensure high selectivity of sulfoxides with their protons. This work represents a crucial step forward in selective oxidation reactions by materials design of dye-semiconductor photocatalysis.

    更新日期:2020-01-07
  • Temperature and Doping-Tuned Coordination Environments around Electroactive Centers in Fe-doped α(β)-Ni(OH)2 for Excellent Water Splitting
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-07
    Qinghe Cao; Mi Luo; Yutian Huang; Qi Liu; Xiaoxing Kong; Jinlong Lei; Zheng Jiang; Jiahai Wang

    In this study, Fe-doped β-Ni(OH)2 exhibited an unpredictable hydrogen evolution reaction (HER) performance, which is much better than that of Fe-doped α-Ni(OH)2. Meanwhile, Fe-doped α-Ni(OH)2 showed a much better oxygen evolution reaction (OER) than Fe-doped β-Ni(OH)2. At 120 and 240 °C, Fe-doped α-Ni(OH)2 and Fe-doped β-Ni(OH)2 are synthesized, respectively, by the addition of Fe3+ into a hydrothermal solution immersed with nickel foam. The higher valence of Ni and Fe in the α-phase benefits the OER performance. In contrast to the α-phase case, the enrichment of the electron cloud around Fe in the β-phase due to surrounding coordination environment is conducive to the HER, which can be verified consistently from XPS, XAFS, XANES and DFT. By taking Fe as the active sites, DFT calculations have confirmed that the energy barrier for each step of the HER is much lower than that corresponding to the Ni site. Only a 53.8 mV overpotential for Fe-doped β-Ni(OH)2-240 is needed to achieve a current density of 10 mA cm-2, which is comparable with most of the active HER electrocatalysts. The electrolyzer cell employing Fe-doped β-Ni(OH)2-240 as the cathode and Fe-doped α-Ni(OH)2-120 as the anode demonstrates superior performance for overall water splitting with excellent stability.

    更新日期:2020-01-07
  • Electrocatalytic cleavage of lignin model dimers using ruthenium supported on activated carbon cloth
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2019-12-19
    Mahlet Garedew; Daniel Young-Farhat; Souful Bhatia; Pengchao Hao; James E. Jackson; Christopher M. Saffron
    更新日期:2020-01-07
  • Amorphous WO3 Induced Lattice Distortion for a Low-Cost and Highly-Efficient Electrocatalyst for Overall Water Splitting in Acid
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-06
    Ke Fan; min he; N. V. R. Aditya Dharanipragada; Panyong Kuang; Yufei Jia; Lizhou Fan; Andrew Ken Inge; Biaobiao Zhang; Licheng Sun; Jiaguo Yu

    The development of highly active and durable catalysts for water oxidation under acidic conditions, is necessary but challenging for renewable energy conversion. Ir-based catalysts are highly efficient for water oxidation in acid, but their application in large scale is hindered by the high cost and scarcity of iridium. Herein, we use an amorphous WO3 induced lattice distortion (AWILD) strategy to reduce the Ir content to only 2 wt% in the final material. The optimized hybrid nitrogen-doped carbon (NC)/WO3/IrO2 can efficiently catalyze water oxidation with a low overpotential of 270 mV at 10 mA cm-2 current density (η10) and high turnover frequency of over 2 s-1 at 300 mV overpotential in 0.5 M H2SO4, a performance that surpasses commercial IrO2 significantly. Introducing the layer of amorphous WO3 between IrO2 nanoparticles and NC can distort the lattice of IrO2, exposing more highly active sites for water oxidation. The AWILD effect compensates for the lower Ir content, and dramatically reduces the cost of the catalyst without sacrificing the catalytic activity. Additionally, this catalyst also exhibits high activity in acids for hydrogen evolution with only 65 mV of η10 attributed to the AWILD effect, exhibiting efficient bifunctionality as a Janus catalyst for overall water splitting. The AWILD approach supplies a novel and efficient strategy for low-cost and highly efficient electrocatalysts for acidic overall water splitting with an extremely low content of noble metals.

    更新日期:2020-01-06
  • Cooperative Effects of Surface and Interface Treatments in Hematite (α-Fe2O3) Photo-Anode on Its Photo-Electrochemical Performance
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-06
    Mika Inaba; Kenji Katayama; Woon Yong Sohn

    To enhance the efficiency of the oxygen evolution reaction of hematite (α-Fe2O3), we engineered both the surface of the hematite nanorods and the FTO/hematite interface simultaneously with an optimal annealing condition. We demonstrated that the enhancement of the photo-electrochemical performance of the hematite film treated by both methods was not just the summation of the improvements originating from each treatment but showed a significant cooperative effect. We clearly revealed that the strong electric field was effectively induced by the surface P doping with the concentration gradient profile, resulting in the band bending even without applying the bias voltage. Furthermore, the dead layer was removed by the TiO2 underlayer, giving rise to Fermi level unpinning. We confirmed that the introduction of the TiO2 underlayer unpinning Fermi level enables to build on the strength of the intrinsic long-lived holes generated by P doping, which is the origin of the cooperative effect.

    更新日期:2020-01-06
  • Shape-stabilized phase change materials supported by eggplants-derived porous carbon for efficient solar-to-thermal energy conversion and storage
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-06
    Yaqiong Li; Xiubing Huang; Yang Li; Zuoshuai Xi; Guangtong Hai; Tao Zhang; Ge Wang

    In order to effectively solve the leakage problem and insufferably low thermal conductivity of organic phase change materials (PCMs), three-dimensional (3D) spongy-like biological porous carbon (BPC) materials derived from eggplants were used as scaffolds for encapsulating polyethylene glycol (PEG) to fabricate shape-stabilized composite phase change materials (ss-CPCMs). The relationship between the micro-morphology of the BPC and the heat storage performance was discussed by controlling the post-pyrolysis temperature to regulate the micro-morphology of carriers. It is found that the BPC consisting of nanopores and macropores with an average diameter of about 44.758 μm extends a high PEG loading (up to 90.1 wt%), while the hierarchical pores can prevent liquid leakage, enabling the melting enthalpy up to 149 J/g. The ss-CPCMs also have excellent thermal cycling properties with a 96.3% retention after 50 cycles. In addition, the hierarchically porous structure of the BPC provides a good network channel for the thermal motion of phonons, which significantly improves the thermal conductivity. Moreover, as an effective photon captor and molecular heater, it meaningfully improves the solar-to-thermal conversion efficiency of PCM composites. Therefore, the BPC with hierarchical scaffolds and excellent thermal conductivity derived from biomass provides promising applications in PCMs via a low-cost and easy preparation process.

    更新日期:2020-01-06
  • Effectiveness of Zr and Hf incorporation into LaCoO3 towards fast and thermodynamic favorable solar thermochemical CO production studied with density functional theory
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-06
    Mingkai Fu; Lei Wang; Tianzeng Ma; Haitao Ma; Huajun Xu; Liguang Dou; Zheshao Chang; Xin Li

    As prominent oxygen carriers for solar thermochemical (STC) cycle, the current Co-based perovskites suffer from low CO production rate and CO2-to-CO conversion ratio. To enhance above performance metrics, the adsorption and dissociation processes of CO2 on LaCoO3(010) defected surface are studied. A transition state with high activation energy (Ea) of 66.8 kJ/mol is determined at the CO2-splitting step, leading to the slow CO production of LaCoO3-based system. However, we find that Ea could be reduced to 51.3 and 52.9 kJ/mol at 12.5% Zr and Hf doped into B position of LaCoO3, as the result of which the CO2-splitting rate could increase up to 8 and 6.4 times larger at T=900 K. Meanwhile, the results of Gibbs free energy change indicate that LaCo0.875Zr0.125O3 and LaCo0.875Hf0.125O3 feature larger thermodynamic driven force of CO2-splitting. In addition, Hf dopant is also favorable for oxygen vacancy formation of LaCoO3. Our results demonstrate the feasibility of LaCo0.875Hf0.125O3 for fast STC CO production with high solar-to-fuel efficiency.

    更新日期:2020-01-06
  • In-Depth Understanding of the CO2 Limitation of Air Fed Anion Exchange Membrane Fuel Cells
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-03
    Ashutosh G Divekar; Ami Neyerlin; Christopher Antunes; Derek Strasser; Andrew R. Motz; Sönke Seifert; Xiaobing Zuo; Bryan Pivovar; Andrew M. Herring

    The interaction of a perfluorinated anion exchange membrane(AEM), initially in the hydroxide form, with atmospheric CO2 at 60 ᵒC and under a range of relative humidities is studied both in a fuel cell and with ex-situ measurements to understand the performance drop. A new novel titration method was used to quantify the amounts of hydroxide,carbonate and bicarbonates in the membrane. However, hydroxide and bicarbonate react internally which disturbs the equilibrium and hence it’s impossible to detect real species concentration using titration. The uptake of CO2 leads to a rise in membrane mass within the first 15 min. The anionic conductivity of the AEM experiences a quick drop within 20 minutes to carbonate, bicarbonate level. However, switching the inlet gas to 0 ppm CO2 reverses the equilibrium due to desorption phenomenon. Investigating the morphology of the film by small angle x-ray scattering shows that the ionomer domains looses intensity as the reaction progresses, the drop is of the double-exponential type but the time of equilibration is slower when compared to that of the conductivity. The wide-angle x-ray scattering data was fit to 3 gaussian peaks showing that the CF2 inter-chain spacing becomes less crystalline during the process. 30% of peak power was lost for this membrane in an AEM fuel cell on addition of CO2, yet we observed the highest H2/ambient air(400 ppm CO2) performance, 446 mW/cm2 reported to date.

    更新日期:2020-01-04
  • Exploration of a novel biorefinery based on sequential hydropyrolysis and anaerobic digestion of algal biofilm: A comprehensive characterization of products for energy and chemical production
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-03
    Poonam Choudhary; Anushree Malik; Kamal K Pant

    This study presents an extensive and detailed characterization of products from hydropyrolysis and anaerobic digestion to propose a multi-pathway assessment of algal biomass conversion. An algal biorefinery based on sequential Hydropyrolysis (HyPy) and anaerobic digestion (AD) of algal biofilm have been comprehensively studied for the first time. Wet and untreated biomass from algal biofilm was directly employed as feedstock for HyPy-AD coupled process and products obtained were characterized by GC-MS, LC-MS, HPLC, CHNS, SEM and TEM micrography. Based on different morphological and structural characterizations, different biorefinery routes were assessed in terms of net energy recovery and ecological impact. Interestingly, upto 42% biocrude yield and 200 mL gVS -1 biomethane yield with net energy ratio (NER) of 1.5 was observed by coupled process of HyPy and AD which gives it cutting edge over other conversion routes. A biorefinery based on these results has been presented considering sustainable approach to valorize whole algal biomass towards multiple product recovery.

    更新日期:2020-01-04
  • Triboelectric Nanogenerators for Macro-scale Blue Energy Harvesting and Self-powered Marine Environmental Monitoring System
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-03
    Huamin Chen; Chao Xing; Yuliang Li; Jun Wang; Yun Xu

    Despite ocean contains extensive undeveloped resources and energy, it is underutilized owing to the current technical flaw such as low conversion efficiency and complex manufacture. Compared to electromagnetic generator (EMG) technology, triboelectric nanogenerator (TENG) has advantages in harvesting flow energy especially in low frequency. As a rapid development in TENG for utilizing ocean energy, it is necessary to summary the periodic progress. In this review, the recent research achievements of TENG in ocean field is reviewed, which concentrates on the optimized structural design and working mechanism in macro-scale blue energy and small-scale marine sensing system. Firstly, the performance comparison of TENG and EMG is conducted. Then, the latest achievements of three types of device including water-involved TENG, non-water-involved TENG and hybrid TENG are summarized. Next, the self-powered small-scale marine sensing system based on TENG for ocean environmental monitoring and water treatment is exhibited. Finally, we summary the prospect and challenges for the macro-scale blue energy and small-scale marine applications with TENG.

    更新日期:2020-01-04
  • Electrochemical CO2 reduction: from nanoclusters to single atom catalysts
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2019-12-17
    Fang Lü; Haihong Bao; Yuying Mi; Yifan Liu; Jiaqiang Sun; Xianyun Peng; Yuan Qiu; Longchao Zhuo; Xijun Liu; Jun Luo
    更新日期:2020-01-04
  • An artificially constructed direct Z-scheme heterojunction: WO3 nanoparticles decorated ZnIn2S4 for efficient photocatalytic hydrogen production
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-02
    Yanze Wang; Da Chen; Yiqian Hu; Laishun Qin; Junhui Liang; Xingguo Sun; Yuexiang Huang

    Photocatalytic H2 evolution has been proven as one of the promising strategies for addressing global energy and environmental issues. Herein, a binary Z-scheme heterostructure of WO3/ZnIn2S4 photocatalyst was artificially constructed through a simple hydrothermal method. A variety of characterization tests were employed to prove the effective coupling of WO3 nanoparticles and ZnIn2S4 particles for the fabrication of the WO3/ZnIn2S4 heterostructure. It was found that the decoration of WO3 nanoparticles could significantly promote the photocatalytic H2 evolution activity of ZnIn2S4 under visible-light irradiation, and the H2 evolution rate of 5 wt%-WO3/ZnIn2S4 composite could reach 1945.88 μmol h-1 g-1, which was 7.9 times that of pristine ZnIn2S4 and could rival those of previously-reported ZnIn2S4-based photocatalysts. On the basis of photoelectrochemical results, the direct Z-scheme heterojunction rather than the type-II heterojunction was proposed to explain the significantly enhanced photocatalytic performance of WO3/ZnIn2S4 photocatalyst. The enhancement of photocatalytic activity could be attributed to the efficient Z-direction charge transfer at the WO3/ZnIn2S4 heterostructure interface thus to reduce the recombination rate of the photogenerated carriers of the system. This work provides new insights into the construction of direct Z-scheme heterostructured ZnIn2S4-based photocatalysts for highly efficient photocatalytic H2 evolution.

    更新日期:2020-01-02
  • Interfacial Engineering of Zinc Blende/Wurtzite Homojunction Photocatalyst through Hybridization with Cobalt Phosphide Co-catalyst for Enhanced Visible-Light-Driven Photocatalytic H2 Evolution
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-02
    Yi-Hao Chew; Boon-Junn Ng; Xin Ying Kong; Lutfi Kurnianditia Putri; Jie-Yinn Tang; Lling-Lling Tan; Siang-Piao Chai

    The incorporation of cobalt phosphide (CoP) as noble-metal-free co-catalyst onto Zn0.5Cd0.5S with a unique zinc blende/wurtzite (ZB/WZ)-homojunction structure (ZCS) has resulted in significantly enhanced photocatalytic activity. The optimized sample, 3CoP-ZCS yielded an exciting 20-time enhancement in H2 evolution (~4.9 mmol h-1 g-1) over pristine ZCS under visible light irradiation. The enhancement was ascribed to the synergistic interaction between the ZB/WZ homojunctions and the close heterojunction formed between ZCS and CoP. Besides being able to effectively suppress the electron-hole recombination, the introduction of CoP was also proven to boost the light absorption ability of the composite in the visible light region. Owing to these beneficial aspects, it was evident to deduce that CoP serves as an efficient co-catalyst for photocatalytic H2 evolution.

    更新日期:2020-01-02
  • Catalytic depolymerization of Kraft lignin to produce liquid fuels via Ni–Sn metal oxide catalysts†
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-02
    Baikai Zhang; Wenzhi Li; Xiaomeng Dou; Jindong Wang; Lele Jin; Ajibola T. Ogunbiyi; Xiaosen Li
    更新日期:2020-01-02
  • Hollow FeCo Alloy Nanoparticles Electrospun in Nitrogen-doped Carbon Nanofiber Enable High Performing Flexible All-Solid-State Zinc-Air Battery
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-02
    Yuanyuan Ma; Wenjie Zang; Afriyanti Sumboja; Lu Mao; Ximeng Liu; Ming Yan Tan; Stephen J. Pennycook; Zongkui Kou; Zhaolin Liu; Li Xu; John Wang

    Hollow-structuring of active components is among the most effective strategies for improving the kinetics of oxygen electrode catalysts, benefiting from the much-boosted active surface area, enhanced accessible active sites, and formation of the desired defects on the exposed surface. Integration of the active hollow nanostructures with functionalized carbon nanofibers synergizes the electrochemical performance and mechanical flexibility, which are particularly of interest for all-solid-state zinc-air batteries (FASS ZABs). In the present work, we demonstrate that the electrospinning of Co-containing Prussian blue analogs can give rise the hollow FeCo alloy nanoparticles assembled in the nitrogen-doped carbon nanofibers (h-FeCo alloy/N-CNFs). The h-FeCo alloy/N-CNFs as-derived exhibits superior bifunctional activities of oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), and thus impressive performance in rechargeable Zn-air batteries. When integrated into a rechargeable FASS ZAB, they enable a high open circuit voltage of 1.335 V and a stable discharge-charge plateau around 1.1 V to 2.0 V, together with a stable voltage efficiency of 63.5% under bending conditions.

    更新日期:2020-01-02
  • Correction: Energy efficiency: a critically important but neglected factor in battery research
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-02
    Ali Eftekhari

    Correction for ‘Energy efficiency: a critically important but neglected factor in battery research’ by Ali Eftekhari, Sustainable Energy Fuels, 2017, 1, 2053–2060.

    更新日期:2020-01-02
  • Correction: Electrochemical energy storage by aluminum as a lightweight and cheap anode/charge carrier
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-02
    Ali Eftekhari; Pablo Corrochano

    Correction for ‘Electrochemical energy storage by aluminum as a lightweight and cheap anode/charge carrier’ by Ali Eftekhari and Pablo Corrochano, Sustainable Energy Fuels, 2017, 1, 1246–1264.

    更新日期:2020-01-02
  • Direct Solar Thermochemical Conversion of Methanol into Syngas via Nanocatalyst at Lower Temperatures
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-02
    Jia Zeng; Xiaoxiao Yu; Yimin Xuan; qiang li; Dong Liu

    Solar thermochemical conversion is an effective way to store unstable solar energy as chemical energy in fuels; and thus, it is of great significance in clean energy economy. Using thermochemical catalyst as the solar energy absorber directly is an advanced way to achieve high efficiency because of the cancellation of the heat resistance resulting from the heat transfer between the solar absorber and the catalyst. In this work, the photo-thermal conversion mechanism of catalyst nanoparticles in solar thermochemical processes was investigated theoretically in the first step. The multi-step temperature variations of catalyst nanoparticles with time were demonstrated. Results show that the direct solar thermochemical conversion performance is significantly enhanced by using the nano-sized catalyst. Then, the CuO/ZnO/Al2O3 nanocatalyst was synthesized and utilized in a customized low-cost experimental system for the direct solar methanol decomposition. Compared with conventional systems, ours requires a lower solar concentration ratio as well as a lower system temperature, and can be easily controlled to adjust the methanol supply rate to realize optimal solar energy utilization efficiency.

    更新日期:2020-01-02
  • 更新日期:2020-01-02
  • High-performance tungsten carbide electrocatalysts for the hydrogen evolution reaction†
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2019-12-13
    Jingwen Huang; Wenting Hong; Jing Li; Bao Wang; Wei Liu
    更新日期:2020-01-02
  • 更新日期:2020-01-02
  • Heterovalent Ga3+ doping in solution-processed Cu2ZnSn(S,Se)4 solar cells for better optoelectronic performance†
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2019-12-09
    Yachao Du; Qingwen Tian; Jin Huang; Yuechao Zhao; Xiaohuan Chang; Afei Zhang; Sixin Wu
    更新日期:2020-01-02
  • Preparation of NiO/KNbO3 nanocomposite via photodeposition method and its superior performance in photocatalytic N2 fixation
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2020-01-01
    Pingxing Xing; Wenqian Zhang; Lu Chen; Xiaoquan Dai; jiali Zhang; Yiming He; Leihong Zhao

    This paper synthesized NiO loaded KNbO3 nanocomposite via photodeposition method and applied it in photocatalytic N2 fixation for the first time. Result indicated that the NiO/KNbO3 composite displayed superior photocatalytic efficiency in NH3 production under simulated sunlight illumination. The optimal NiO/KNbO3 sample showed an NH3-generation rate of 470.6 μmol•g-1•h-1, which reaches 4.8 times that of pristine KNbO3. Various characterizations including XRD, Raman, XPS, DRS, PC, EIS, LSV were applied to reveal the nature behind the high photoactivity of NiO/KNbO3. The addition of NiO nanoparticles showed a slight effect on the specific surface area and the optical property of KNbO3, but elevated the charge separation efficiency which was verified to be the key role in affecting the photocatalytic reaction. The introduced NiO fabricated a p-n heterojunction structure with KNbO3 and hence achieved the enhanced efficiency in separating electrons and holes via a type-II mechanism. The cycling test further demonstrated that the NiO/KNbO3 sample has high photocatalytic stability, indicating its good potential in photocatalytic nitrogen fixation.

    更新日期:2020-01-02
  • Fe and W doped Bi2MoO6 nanoflakes: Promising material for efficient solar water splitting
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2019-12-30
    Mohua Chakraborty; Sourav Ghosh; Venkataramanan Mahalingam

    Recently, Bi2MoO6 (BMO) has been extensively investigated for its noticeable photoelectrochemical water oxidation property. However, the poor chemical stability and high photo-corrosion suppressed its potential application and efficiency of solar energy conversion. In this work, the BMO films have been successfully grown via solvothermal method with different duration and the optimized synthesis conditions have been further retained to prepare Fe and W doped BMO photoanodes. Photocurrent densities as high as ≈1.81, 0.89, 0.43 mA/cm2 at 1.23 V vs. RHE are obtained for optimum 1% W, 1% Fe doped and pristine BMO, respectively, under light illumination AM 1.5 (100 mW/cm2) in 0.1 M Na2SO4 electrolyte in presence of 0.05 M Na2SO3 hole scavenger. High photocurrent density of about 107.48 µA/cm2 vs. 1.23 V vs. RHE is obtained for optimized W doped photoanode in the absence of 0.05M Na2SO3 electrolyte, which is 2.18 and 1.22 times enhanced compared to optimum undoped BMO and Fe doped BMO thin film photoanodes, respectively. The dopant contributed to oxygen vacancy, film conductivity and helped both in terms of stability and PEC activity. W and Fe dopants in BMO exhibit considerable stability under water and sulfite oxidation condition compared to undoped BMO in the absence of any oxygen evolution co-catalysts.

    更新日期:2019-12-30
  • Sustainable nitrogen-doped carbon electrodes for high-performance supercapacitors and Li-ion capacitors
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2019-12-27
    Yulong Zheng; Huanlei Wang; Shijiao Sun; Gaofei Lu; Haolin Liu; Minghua Huang; Jing Shi; Wei Liu; Haiyan Li

    It is still a challenge to design energy storage systems with both high energy density and power density by using low-cost electrodes. Therefore, we propose a successful doped porous carbon synthesis using agricultural waste-ginger straw, which can be fabricated high performance supercapacitors and Li-ion capacitors. Nitrogen doping in the carbon structure improves the wettability and alters the electronic structure, playing a pivotal role in providing extra charge storage capacity. The fabricated ionic liquid-based supercapacitors display an outstanding capacitance of 122 F g-1 at 0.5 A g-1 with a distinguished capacitance retention ratio of 73% at 100 A g-1, an excellent specific energy of 37.8 Wh kg-1 at 374 W kg-1, and a low capacitance loss of 13.5% after 10,000 cycles. Based on LiPF6 electrolyte, the doped carbon as anode shows a high capacity of 1531 mA h g-1 at 0.1 A g-1, and the fabricated Li-ion capacitor exhibits a higher specific energy of 214.6 Wh kg−1 at 373.5 W kg−1, maintains of 63.6 Wh kg−1 at the high specific power of 65.4 kW kg−1, and shows a great cycle performance with 82.7% capacity retention after 10,000 cycles. This work highlights that sustainable doped carbon electrodes are promised to be an advanced energy storage system.

    更新日期:2019-12-27
  • Pyroelectric power generation from the waste heat of automotive exhaust gas
    Sustainable Energy Fuels (IF 4.912) Pub Date : 2019-12-24
    Juyoung Kim; Satoru Yamanaka; Ichiro Murayama; Takanori Katou; Tomokazu Sakamoto; Takuro Kawasaki; Tatsuo Fukuda; Tohru Sekino; Tadachika Nakayama; Masatoshi Takeda; Masaaki Baba; Hirohisa Tanaka; Kazuya Aizawa; Hideki Hashimoto; Yoonho Kim
    更新日期:2019-12-25
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