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Direct growth of Fe3O4-MoO2 hybrid nanofilm anode with enhanced electrochemical performance in neutral aqueous electrolyte

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Progress in Natural Science:materials International 2016年第3期26卷 258-263页

作者： Ruizhi Li Xin Ba Yimeng Wang Wenhua Zuo Chong Wang Yuanyuan Li Jinping Liu School of Chemistry Chemical Engineering and Life Science and State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of Technology Institute of Nanoscience and Nanotechnology Department of Physics Central China Normal University School of Optical and Electronic Information Huazhong University of Science and Technology

To enhance the electrochemical energy storage performance of supercapacitors（SCs）, the current researches are general directed towards the cathode materials. However, the anode materials are relatively less studied. In the present work, Fe3O4-MoO2（FO-MO） hybrid nano thin film directly grown on Ti substrate is investigated, which is used as high-performance anode material for SCs in Li2SO4electrolyte with the comparison to pristine Fe3O4nanorod array. The areal capacitance of FO-MO hybrid electrode was initially found to be 65.0 m F cm-2at 2 m Vs-1and continuously increased to 260.0% after 50 cycles of activation. The capacitance values were considerably comparable or higher than many reported thinfilm iron oxide-based anodes in neutral electrolyte. With the protection of MoO2shell, the FO-MO electrode developed in this study also exhibited excellent cyclic stability（increased to 230.8% after 1000cycles）. This work presents a promising way to improve the electrochemical performance of iron oxidebased anodes for SCs.

关键词： Magnetite MoO2 Supercapacitor Binder-free anode Hybridization

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Physical and chemical dual-confinement of polysulfides within hierarchically meso-microporous nitrogen-doped carbon nanocages for advanced Li–S batteries

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RSC Advances 2017年第68期7卷 42627-42633页

作者： Pan Wu Ming-Hui Sun Yong Yu Zhao Peng Shimeles T. Bulbula Yu Li Li-Hua Chen Bao-Lian Su Laboratory of Living Materials The State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan China Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 Rue de Bruxelles B-5000 Namur Belgium Department of Chemistry and Clare Hall University of Cambridge Cambridge UK

Lithium–sulfur (Li–S) batteries with high theoretical specific energy (1675 mA h g−1), environmental benignity and low cost are considered to be some of the most promising next-generation energy-storage systems comp...

Lithium–sulfur (Li–S) batteries with high theoretical specific energy (1675 mA h g⁻¹), environmental benignity and low cost are considered to be some of the most promising next-generation energy-storage systems compared with conventional lithium-ion batteries. However intrinsic large volume expansion and irreversible loss of activated materials seriously limit their commercial applications. To solve the problems, nitrogen-doped hierarchical carbon nanocages were synthesized and used as efficient sulfur hosts. The synthesized nitrogen doped hierarchically meso-microporous carbon (N-MMC) had large BET surface area and mesopore volumes, contributing to high sulfur loading and a reduced volume-change effect of sulfur during lithiation. Moreover, the strong physical adsorption in the micropores together with improved chemical adsorption caused by nitrogen doping lead to effective polysulfide trapping. The N-MMC/S exhibited high initial capacities of 1202.2 mA h g⁻¹ at 0.2C and 1024 mA h g⁻¹ at 0.5C. The capacity kept at as high as 780 mA h g⁻¹ after 60 cycles at 0.2C and 623.8 mA h g⁻¹ after 70 cycles at 0.5C.

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A review on TiO_2-based Z-scheme photocatalysts

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Chinese Journal of Catalysis 2017年第12期38卷 1936-1955页

作者： Kezhen Qi Bei Cheng Jiaguo Yu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 Hubei China Institute of Catalysis for Energy and Environment College of Chemistry and Chemical Engineering Shenyang Normal University Shenyang 110034Liaoning China Department of Science and Environmental Studies the Education University of Hong Kong Tai Po N. T. Hong Kong China Department of Physics Faculty of Science King Abdulaziz University Jeddah 21589 Saudi Arabia

TiO2‐based Z‐scheme photocatalysts have attracted considerable attention because of the low recombination rate of their photogenerated electron–hole pairs and their high photocatalytic *** this review,the reaction mechanism of Z‐scheme photocatalysts,recent research progress in the application of TiO2‐based Z‐scheme photocatalysts,and improved methods for photocatalytic performance enhancement are *** applications,including water splitting,CO2reduction,decomposition of volatile organic compounds,and degradation of organic pollutants,are also *** main factors affecting the photocatalytic performance of TiO2‐based Z‐scheme photocatalysts,such as pH,conductive medium,cocatalyst,architecture,and mass ratio,are *** remarks are presented,and some suggestions for the future development of TiO2‐based Z‐scheme photocatalysts are highlighted.

关键词： TiO2 Z‐scheme photocatalyst Water splitting CO2 reduction Pollutant degradation

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NiO spacer mediated magnetic anisotropy in L10−FePt/NiO/A1−FePt trilayer structures

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Physical Review B 2017年第13期95卷 134406-134406页

作者： Tenghua Gao Takashi Harumoto Song Zhang Rong Tu Lianmeng Zhang Yoshio Nakamura Ji Shi School of Materials and Chemical Technology Tokyo Institute of Technology 2-12-1 Oh-okayama Meguro-ku Tokyo 152-8552 Japan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430074 People's Republic of China

L10−FePt/NiO/A1−FePt trilayers have been grown on MgO(001) substrate, in which the top FePt layer is of A1 structure, and the bottom FePt layer is of L10 structure with 001 preferred orientation and strong perpendicular anisotropy. This structure gives rise to a 90∘ spin alignment configuration of the two ferromagnetic layers across the NiO spacer. To further manipulate the spin configurations of the trilayer structure, we performed an in-plane field cooling (FC). The subsequent hysteresis measurements for the top FePt layer show unambiguous angular dependence of remanent magnetization relative to the direction of the field during FC; i.e., in-plane anisotropy is induced. Taking into account the spin-flop configuration predicted in previous theoretical study, the coupling at the lower interface makes the Ni spins cant out of the (1¯1¯1) easy plane, and difficult to rotate around the axis perpendicular to the film plane. Correspondingly, the induced anisotropy after FC is considered to result from the realignment of Ni spins and enhancement of the coupling at the upper interface. The magnetic domain imaging results for the bottom perpendicular magnetized FePt layer strongly support this consideration; some of the stripe domains tend to be along the direction of the applied field during FC with reduced stripe width.

关键词： Antiferromagnetism Exchange bias Exchange interaction Ferromagnetism Magnetic anisotropy Antiferromagnets Ferromagnets Magnetic multilayers Magnetic force microscopy Magnetization measurements Sputtering X-ray diffraction

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Hierarchical CdS/m-TiO 2 /G ternary photocatalyst for highly active visible light-induced hydrogen production from water splitting with high stability

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Nano Energy 2018年 47卷 8-17页

作者： Yi Lu Xiu Cheng Ge Tian Heng Zhao Li He Jie Hu Si-Ming Wu Ying Dong Gang-Gang Chang Silvia Lenaerts Stéphane Siffert Gustaaf Van Tendeloo Zhao-Fei Li Ling-Ling Xu Xiao-Yu Yang Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road 430070 Wuhan Hubei China Research Group of Sustainable Energy and Air Purification (DuEL) Department of Bioscience Engineering University of Antwerp Antwerp Belgium Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV) – Université Littoral Côte d’Opale 145 Avenue Maurice Schuman 59140 Dunkerque France EMAT (Electron Microscopy for Materials Science) University of Antwerp Groenenborgerlaan 171 B-2020 Antwerpen Belgium Petrochemical Research Institute of PetroChina Beijing 102206 China National Center for Magnetic Resonance in Wuhan State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan China Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles B-5000 Namur Belgium

Hierarchical semiconductors are the most important photocatalysts, especially for visible light-induced hydrogen production from water splitting. We demonstrate herein a hierarchical electrostatic assembly approach to hierarchical CdS/m-TiO 2 /G ternary photocatalyst, which exhibits high photoactivity and excellent photostability (more than twice the activity of pure CdS while 82% of initial photoactivity remained after 15 recycles during 80 h irradiation). The ternary nanojunction effect of the photocatalyst has been investigated from orbitals hybrid, bonding energy to atom-stress distortion and nano-interface fusion. And a coherent separation mechanism of charge carriers in the ternary system has been proposed at an atomic/nanoscale. This work offers a promising way to inhibit the photocorrosion of CdS and, more importantly, provide new insights for the design of ternary nanostructured photocatalysts with an ideal heterojunction.

关键词： CdS Mesoporous TiO 2 Graphene sheets Ternary photocatalysis Visible light-induced water splitting

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Chemical/Light‐Powered Hybrid Micromotors with “On‐the‐Fly” Optical Brakes

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Angewandte Chemie 2018年第27期130卷

作者： Chuanrui Chen Songsong Tang Hazhir Teymourian Emil Karshalev Fangyu Zhang Jinxing Li Fangzhi Mou Yuyan Liang Jianguo Guan Joseph Wang Department of Nanoengineering University of California San Diego La Jolla CA 92093 USA State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. China

Hybrid micromotors capable of both chemically powered propulsion and fuel‐free light‐driven actuation and offering built‐in optical brakes for chemical propulsion are described. The new hybrid micromotors are designed by combining photocatalytic TiO 2 and catalytic Pt surfaces into a Janus microparticle. The chemical reactions on the different surfaces of the Janus particle hybrid micromotor can be tailored by using chemical or light stimuli that generate counteracting propulsion forces on the catalytic Pt and photocatalytic TiO 2 sides. Such modulation of the surface chemistry on a single micromotor leads to switchable propulsion modes and reversal of the direction of motion that reflect the tuning of the local ion concentration and hence the dominant propulsion force. An intermediate Au layer (under the Pt surface) plays an important role in determining the propulsion mechanism and operation of the hybrid motor. The built‐in optical braking system allows “on‐the‐fly” control of the chemical propulsion through a photocatalytic reaction on the TiO 2 side to counterbalance the chemical propulsion force generated on the Pt side. The adaptive dual operation of these chemical/light hybrid micromotors, associated with such control of the surface chemistry, holds considerable promise for designing smart nanomachines that autonomously reconfigure their propulsion mode for various on‐demand operations.

关键词： Chemischer Antrieb Janus-Mikromotoren Optische Bremsen Photokatalytische Reaktionen

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Effects of Annealing Processes on CuxSi(1-x) Thin Films

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Journal of Wuhan University of technology(materials Science) 2016年第1期31卷 31-34页

作者：章嵩 WU Jun HE Zhiqiang 涂溶 SHI Ji ZHANG Lianmeng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070China Department of Metallurgy and Ceramics Science Tokyo Institute of Technology Tokyo 152-8552 Japan Institute for Materials Research Tohoku University Sendal 980-8577 Japan

The CuxSi（1-x） thin films have been grown by pulsed laser deposition（PLD） with in situ annealing on Si（001） and Si（111）,*** transformation of phase was detected by X-ray diffraction（XRD）.The results showed that the as-deposited films were composed of Cu on both Si（001） and Si（111）.The annealed thin films consisted of Cu ＋η ＂-Cu3Si on Si（001） while Cu ＋η＇-Cu3Si on Si（111）,respectively,at annealed temperature（Ta）= 300-600℃.With the further increasing of Ta,at Ta= 700℃,there was only one main phase,η＂-Cu3Si on Si（001） while η＇-Cu3Si on Si（111）,*** annealed thin films transformed from continuous dense structure to scattered-grain morphology with increasing Ta detected by field emission scanning electron microscope（FESEM）.It was also showed that the grain size would enlarge with increasing annealing time（ta）.

关键词： CuxSi1-x thin films PLD phase surface morphology

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Hierarchically Dual-Mesoporous TiO2 Microspheres for Enhanced Photocatalytic Properties and Lithium Storage

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Chemistry (Weinheim an der Bergstrasse, Germany) 2018年第50期24卷 13246-13252页

作者： Sa Xiao Yi Lu Xin Li Bing-Yu Xiao Liang Wu Jian-Ping Song Yu-Xuan Xiao Si-Ming Wu Jie Hu Yong Wang Gang-Gang Chang Ge Tian Silvia Lenaerts Christoph Janiak Xiao-Yu Yang Bao-Lian Su State Key Laboratory Advanced Technology for Materials Synthesis and Processing and School of Materials Science & Engineering Wuhan University of Technology 122 Luoshi Road 430070 Wuhan China. School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology 122 Luoshi Road 430070 Wuhan China. Research Group of Sustainable Energy and Air Purification (DuEL) Department of Bioscience Engineering University of Antwerp Antwerp Belgium. Institut für Anorganische Chemie und Strukturchemie Heinrich-Heine-Universität Düsseldorf 40204 Düsseldorf Germany. School of Engineering and Applied Sciences Harvard University Cambridge Massachusetts 02138 USA. Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles 5000 Namur Belgium.

Hierarchically dual-mesoporous TiO microspheres have been synthesized by a solvothermal process in the presence of 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm][BF ]) and diethylenetriamine (DETA) as co-templates. Secondary mesostructured defects in the hierarchical TiO microspheres produce oxygen vacancies, which not only significantly enhance photocatalytic activity in the degradation of methylene blue (1.7 times that with P25) and acetone (2.9 times that with P25), but are also beneficial for lithium storage. Moreover, we propose a mechanism to rationalize the role of this dual mesoporosity of the TiO microspheres in enhancing molecular diffusion, ion transportation, and electronic transitions.

关键词： energy storage hierarchical dual-mesoporous TiO2 ionic liquids mesostructured defects photocatalysis template synthesis

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Perovskite Quantum Dots: Ultrathin, Core–Shell Structured SiO2Coated Mn2+-Doped Perovskite Quantum Dots for Bright White Light-Emitting Diodes (Small 19/2019)

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Small 2019年第19期15卷

作者： Xiaosheng Tang Weiwei Chen Zhengzheng Liu Juan Du Zhiqiang Yao Yi Huang Cheng Chen Zhaoqi Yang Tongchao Shi Wei Hu Zhigang Zang Yu Chen Yuxin Leng Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education) College of Optoeletronic Engineering Chongqing University Chongqing 400044 China State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China State Centre for International Cooperation on Designer Low-Carbon and Environmental Materials (ICDLCEM) School of Materials Science and Engineering Zhengzhou University Zhengzhou 450001 China College of Optoeletronic Engineering Chongqing University of Posts and Telecommunications Chongqing 400065 P. R. China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China School of Pharmaceutical Sciences Jiangnan University Jiangsu 214122 China School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou 215006 China

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Electrochemical Behavior of Magnolol on FeWO4 Nanoflower Modified Carbon Paste Electrode

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Journal of Wuhan University of technology(materials Science) 2016年第4期31卷 722-726页

作者：胡卫兵 ZHANG Wen SONG Nannan QU Wanyun HU Sheng Key Laboratory of Biological Resources Protection and Utilization of Hubei Province Hubei University for Nationalities. Enshi 445000 China School of Chemical and Environmental Engineering Hubei University for Nationalities Enshi 445000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

In order to establish a simple,sensitive,and fast reliable detection method to determine the magnolol,FeWO4 nanoflower was synthesised through a solvothermal technique and FeWO4 nanoflower modified carbon paste electrode（CPE） was *** voltammetric behavior of magnolol on the modified electrodes was studied using cyclic voltammetry（CV）,linear sweep voltammetry（LSV）,and differential pulse voltammetry（DPV）.The experimental results showed that the modified electrode remarkably enhanced the electrochemical response of the magnolol and exhibited a wide linear range for determination of the magnolol from 1.0×10-7 to 1.0×10-4 mol/L with a low detection limit of 5.0×10-8 mol/L.

关键词： voltammetry Paste paste remarkably Modified graphite paraffin anodic electrolyte silica

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