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题名: The electrochemical properties of Ti0.9Zr0.2Mn1.5Cr0.3V0.3-x wt% La0.7Mg0.25Zr0.05Ni2.975Co0.525 (x=0, 5, 10) hydrogen storage composite electrodes
作者: Chu, Hai-Liang;  Zhang, Yao;  Sun, Li-Xian;  Qiu, Shu-Jun;  Xu, Fen;  Yuan, Hua-Tang
关键词: hydrogen storage electrodes ;  Ti-Mn-based laves phase alloy ;  surface modification ;  electrochemical properties ;  ball milling ;  La-Mg-based alloy
刊名: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
发表日期: 2007-08-01
DOI: 10.1016/j.ijhydene.2006.09.015
卷: 32, 期:12, 页:1898-1904
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Electrochemistry ;  Energy & Fuels
研究领域[WOS]: Chemistry ;  Electrochemistry ;  Energy & Fuels
英文摘要: In the present work, new type hydrogen storage composites electrodes Ti0.9Zr0.2Mn1.5Cr0.3V0.3-x wt% La0.7Mg0.25Zr0.05Ni2.975 Co-0.525 (x = 0, 5, 10) were successively prepared by ball milling method. The structure and electrochemical properties of the composites were investigated by means of XRD, SEM, EDS and electrochemical measurements. It was found that the bulk of the composites still retained the hexagonal C14 Laves structure after short-term ball milling and that the maximum capacity of the composite electrodes was significantly improved to 292.4 and 314.0mA h/g for x =5 and 10, respectively, from maximum 48.6mA h/g of Ti0.9Zr0.2Mn1.5Cr0.3V0.3 alloy electrode. Electrochemical impedance spectra and cyclic voltammograms (CV) measurements revealed that the charge-transfer resistance was reduced with increasing amount of La-Mg-based alloy. The increasing x amount also lifted the values of hydrogen diffusion coefficient D of the composite electrodes obtained by anodic polarization (AP) measurements. These indicated that the La-Mg-based alloy as a surface modifier not only increased the discharge capacity but also improved the charge-discharge kinetics of composite electrode greatly. (c) 2006 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
关键词[WOS]: LAVES PHASE ALLOYS ;  METAL HYDRIDE ELECTRODES ;  NANOPARTICLES ;  MECHANISM ;  POWDER
语种: 英语
WOS记录号: WOS:000249739100037
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140506
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Mat Thermochem Lab, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
3.Nankai Univ, Inst New Energy Mat Chem, Tianjin 300071, Peoples R China

Recommended Citation:
Chu, Hai-Liang,Zhang, Yao,Sun, Li-Xian,et al. The electrochemical properties of Ti0.9Zr0.2Mn1.5Cr0.3V0.3-x wt% La0.7Mg0.25Zr0.05Ni2.975Co0.525 (x=0, 5, 10) hydrogen storage composite electrodes[J]. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,2007,32(12):1898-1904.
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