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Acid-activated and WO_x-loaded montmorillonite catalysts and their catalytic behaviors in glycerol dehydration

Chinese Journal of Catalysis 2017年第6期38卷 1087-1100页

作者： Weihua Yu Pengpeng Wang Chunhui Zhou Hanbin Zhao Dongshen Tong Hao Zhang Huimin Yang Shengfu Ji Hao Wang Zhijiang College Zhejiang University of Technology Hangzhou 310024 Zhejiang China Research Group for Advanced Materials & Sustainable Catalysis (AMSC) Research Center for Clay Minerals State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology Discipline of Industrial Catalysis College of Chemical Engineering Zhejiang University of Technology Hangzhou 310 Centre for Future Materials University of Southern Queensland Toowoomba Queensland 4350 Australia Engineering Research Center of Non‐metallic Minerals of Zhejiang Province Zhejiang Institute of Geology and Mineral Resource Hangzhou 310007 Zhejiang China Key Laboratory of High Efficient Processing of Bamboo of Zhejiang Province China National Bamboo Research Center Hangzhou 310012 ZhejiangChina State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China

The use of H2SO4‐,HCl‐,H3PO4‐,and CH3COOH‐activated montmorillonite(Mt)and WOx/H3PO4‐activated Mt as catalysts for the gas‐phase dehydration of glycerol was *** WOx/H3PO4‐activated Mt catalysts were prepared by an impregnation method using H3PO4‐activated Mt(Mt‐P)as the *** catalysts were characterized using powder X‐ray diffraction,Fourier‐transform infrared spectroscopy,N2adsorption‐desorption,diffuse reflectance ultraviolet‐visible spectroscopy,temperature‐programmed desorption of NH3,and thermogravimetric *** acid activation of Mt and WOx loaded on Mt‐P affected the strength and number of acid sites arising from H+exchange,the leaching of octahedral Al3+cations from Mt octahedral sheets,and the types of WOx(2.7≤x≤3)species(i.e.,isolated WO4/WO6‐containing clusters,two‐dimensional[WO6]polytungstates,or three‐dimensional WO3crystals).The strong acid sites were weakened,and the weak and medium acid sites were strengthened when the W loading on Mt‐P was12wt%(12%W/Mt‐P).The12%W/Mt‐P catalyst showed the highest catalytic *** gave a glycerol conversion of89.6%and an acrolein selectivity of81.8%at320°*** deposition on the surface of the catalyst led to deactivation.

关键词： Glycerol Acrolein Dehydration WOx Acid‐activated nanoclay Catalyst

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Vertically stacked holey graphene/polyaniline heterostructures with enhanced energy storage for on-chip micro-supercapacitors

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Nano Research 2016年第4期9卷 1012-1021页

作者： Xiaocong Tian Bei Xiao Xu Xu Lin Xu Zehua Liu Zhaoyang Wang Mengyu Yan Qiulong Wei Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Chemistry and Biochemistry University of California Los Angeles California 90095 USA Department of Chemistry and Chemical Biology Harvard University Cambridge Massachusetts 02138 USA These authors contributed equally to this work.

Planar micro-supercapacitors （MSCs） have drawn extensive research attention owing to their unique structural design and size compatibility for microelectronic devices. Graphene has been widely used to improve the performance of microscale electrochemical capacitors. However, investigations of an intrinsic electrochemical mechanism for graphene-based microscale devices are still not sufficient. Here, micro-supercapacitors with various typical architectures are fabricated as models to study the graphene effect, and their electrochemical performance is also evaluated. The results show that ionic accessibility and adsorption are greatly improved after the introduction of the holey graphene intermediate layer. This study provides a new route to understand intrinsic electrochemical behaviors and possesses exciting potential for highly efficient on-chip micro-energy storage.

关键词： micro-supercapacitors holey graphene heterostructures ionic accessibility intrinsic electrochemical behaviors

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Hollow spherical LiNi_(0.5)Mn_(1.5)O_4 built from polyhedra with high-rate performance via carbon nanotube modification

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Science China materials 2016年第2期59卷 95-103页

作者：王洛洛胡正耀赵康宁罗艳珠魏湫龙唐春娟胡平任文皓麦立强 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Lithium nickel manganese oxide spinel(Li Ni0.5-Mn1.5O4, LNMO) has attracted much attention as the cathode material for rechargeable lithium-ion batteries due to its high energy density and low cost. However, the short cycle life and poor high-rate capability hinder its commercialization. In this study, we synthesized hollow spherical LNMO built from polyhedral particles. The LNMO hollow structure guarantees sufficient contact with electrolyte and rapid diffusion of lithium ions. To enhance the conductivity, we use carbon nanotubes(CNTs) to modify the surface of the cathode. After CNT modification, the LNMO hollow structure manifests outstanding cycling stability and high-rate capability. It delivers a discharge capacity of 127 m A h g-1 at 5 C, maintaining 104 m A h g-1 after 500 cycles. Even at a high rate of 20 C, a capacity of 121 m A h g-1 can be obtained. The excellent electrochemical performance is ascribed to the unique structure and the enhanced conductivity through CNT modification. It is demonstrated that the CNTmodified hollow spherical LNMO is a promising cathode for lithium ion batteries.

关键词： lithium nickel manganese oxide spinel hollow sphere carbon nanotube modification high-rate performance lithium-ion batteries

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Controlled synthesis of mesoporous nanostructured anatase TiO2 on a genetically modified Escherichia coli surface for high reversible capacity and long-life lithium-ion batteries

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RSC Advances 2016年第64期6卷 59422-59428页

作者： Xue, Shuang-Hong Xie, Hao Ping, Hang Xu, Xiao-Mei Li, Jing Yang, Xiao-Yu Fu, Zheng-Yi Su, Bao-Lian Laboratory of Living Materials State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan430070 China Laboratory of Inorganic Materials Chemistry University of Namur NamurB-5000 Belgium

TiO2 is a promising anode material for lithium-ion batteries. The electrochemical performance of TiO2 can be improved by optimization of nanostructures. The present study was proposed to control the synthesis of mesoporous nanostructured anatase TiO2 on a genetically modified Escherichia coli surface. A recombinant protein INP-SiliSila containing functional domains of silicatein-α and silaffin was constructed and expressed on the E. coli surface. Deposition of the TiO2 precursor was facilitated by INP-SiliSila on the E. coli surface. Upon calcination, TiO2 coating on the E. coli surface transformed to anatase and formed well-defined rod-shaped particles. The electrochemical performance of the as-prepared anatase TiO2 as anode electrodes was improved and better than that of most reported ones. The present study not only provides an organism-based approach for fabricating nanostructured anatase TiO2 with enhanced electrochemical performance, but also opens a new avenue to take advantage of genetically modified bacterial surfaces in the synthesis and structure control of materials. © 2016 The Royal Society of Chemistry.

关键词： Escherichia coli

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Enhanced Strength Through Nanotwinning in the Thermoelectric Semiconductor InSb

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Physical Review Letters 2017年第21期119卷 215503-215503页

作者： Guodong Li Sergey I. Morozov Qingjie Zhang Qi An Pengcheng Zhai G. Jeffrey Snyder State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Materials Science and Engineering Northwestern University Evanston Illinois 60208 USA Department of Computer Simulation and Nanotechnology South Ural State University Chelyabinsk 454080 Russia Department of Chemical and Materials Engineering University of Nevada Reno Reno Nevada 89557 USA

The conversion efficiency (zT) of thermoelectric (TE) materials has been enhanced over the last two decades, but their engineering applications are hindered by the poor mechanical properties, especially the low strength at working conditions. Here we used density functional theory (DFT) to show a strength enhancement in the TE semiconductor InSb arising from the twin boundaries (TBs). This strengthening effect leads to an 11% enhancement of the ideal shear strength in flawless crystalline InSb where this theoretical strength is considered as an upper bound on the attainable strength for a realistic material. DFT calculations reveal that the directional covalent bond rearrangements at the TB accommodating the structural mismatch lead to the anisotropic resistance against the deformation combined with the enhanced TB rigidity. This produces a strong stress response in the nanotwinned InSb. This work provides a fundamental insight for understanding the deformation mechanism of nanotwinned TE semiconductors, which is beneficial for developing reliable TE devices.

关键词： material failure Mechanical deformation Semiconductors Stress Density functional theory

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Energy Storage: Recent Progress in Iron-Based Electrode materials for Grid-Scale Sodium-Ion Batteries (Small 9/2018)

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Small 2018年第9期14卷

作者： Yongjin Fang Zhongxue Chen Lifen Xiao Xinping Ai Yuliang Cao Hanxi Yang College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power Sources Wuhan University Wuhan 430072 China School of Power and Mechanical Engineering Wuhan University Wuhan 430072 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

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Microporous carbon nanofibers prepared by combining electrospinning and phase separation methods for supercapacitor

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Journal of Energy Chemistry 2016年第4期25卷 587-593页

作者： Chang Liu Yongtao Tan Ying Liu Kuiwen Shen Bowu Peng Xiaoqin Niu Fen Ran School of Material Science and Engineering Lanzhou University of Technology State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology

Microporous carbon nanofibers (MCNFs) derived from polyacrylonitrile nanofibers were fabricated via electrospinning technology and phase separation in the presence of polyvinylpyrrolidone (PVP). PVP together with a mixed solvent of N, N-Dimethylformamide and dimethyl sulfoxide was used as pore forming agent. The influences of PVP content in casting solution on the structure and electrochemical performance of the MCNFs were also investigated. The highest capacitance of 200 F/g was obtained on a three-electrode system at a scan rate of 0.5 A/g. The good performance was owing to the high specific surface area and the large amount of micro-pores, which enhanced the absorption and the transportation efficiency of electrolyte ion during charge/discharge process. This research indicated that the combination of electrospinning and phase separation technology could be used to fabricate microporous carbon nanofibers as electrode materials for supercapacitors with high specific surface area and outstanding electrochemical performance. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.

关键词： Supercapacitor Electrospinning Nanofiber Phase separation

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The Fabrication of Silver/Poly(Methyl Methacrylate) Nanocomposite with Size-Controlled In-Situ synthesis Method

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功能材料信息 2016年第5期13卷 45-46页

作者： Chun Gu Guoqiang Luo Ruizhi Zhang Jian Zhang Yuan Li Qiang Shen Lianmeng Zhang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

The Ag/poly(methyl methacrylate)(PM-MA)nanocomposite materials have been intensive-ly studied owing to its superior mechanical,opticaland electrical *** this paper,Monodispersed silver nanoparticles with controllable ... 详细信息

关键词：英语阅读理解复合材料

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An investigation of the corrosion and fouling resistance of Zn-Ni/Cr2O3-TiO2-CuO-SiO2/PTFE composite ceramic coatings

An investigation of the corrosion and fouling resistance of ...

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International Thermal Spray Conference and Exposition, ITSC 2016

作者： Qing-Yu, L.I. Xu-Dong, Cheng Wei-Ping, Y.E. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9781510844001

In this study, Zn-Ni/Zn-Ni/Cr2O3-TiO2-CuO-SiO2/PTFE composite coatings were deposited on stainless steel (SS) substrates by Atmospheric Plasma Spraying (APS), aiming at possessing the capability of wear, corrosion and stain resistance. The microstructures and phases of the composite coatings were revealed by X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The corrosion resistance of the coatings was characterized by Neutral Salt Spray (NSS) test, polarization curve, weightlessness experiment and immersion corrosion test. The fouling resistance of the coatings was investigated by wear test under water-lubrication condition. The reciprocating parts with the coatings were relatively intact after 5000h immersion test in realistic ocean environment. The research revealed that the cyclical changes of the coatings weight were influenced by the weight fluctuate of dissolution of oxide film and the accumulation of secondary products. Furthermore, the PTFE sealed the porosity of the coatings surface which applied the surface of coatings less micro-porosity. With sealing reagent and Ti02 particle penetrating into the pores, leading to the decline of porosity in the coatings, the low-porosity made the composite ceramic coatings effective in reducing and retarding the corrosion and wear of reciprocating parts.

关键词： Composite coatings

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TiO_(2) nanosheets with exposed {001} facets for photocatalytic applications

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Nano Research 2016年第1期9卷 3-27页

作者： Chimmikuttanda Ponnappa Sajan Swelm Wageh Ahmed.A.Al-Ghamdi Jiaguo Yu Shaowen Cao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Physics and Engineering Mathematics Department Faculty of Electronic EngineeringMenoufia UniversityMenouf32952Egypt

TiO_(2) nanosheets with highly reactive{001}facets({001}-TiO_(2))have attracted great attention in the fields of science and technology because of their unique *** recent years,many efforts have been made to synthesize{001}-TiO_(2) and to explore their applications in *** this review,we summarize the recent progress in preparing{001}-TiO_(2) using different techniques such as hydrothermal,solvothermal,alcohothermal,chemical vapor deposition(CVD),and sol gel-based ***,the enhanced efficiency of{001}-TiO_(2) by modification of carbon materials,surface deposition of transition metals,and non-metal doping is ***,the applications of{001}-TiOR-based photocatalysts in the degradation of organic dyes,hydrogen evolution,carbon dioxide(CO_(2))reduction,bacterial disinfection,and dye-sensitized solar cells are *** believe this entire review on TiO_(2) nanosheets with{001}facets can further inspire researchers in associated fields.

关键词： TiO_(2) nanosheets {001}facets photocatalysis

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