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题名: Structure and electrochemical properties of composite electrodes synthesized by mechanical milling Ni-free TiMn2-based alloy with La-based alloys
作者: Chu, Hailiang;  Zhang, Yao;  Sun, Lixian;  Qiu, Shujun;  Qi, Yanni;  Xu, Fen;  Yuan, Huatang
通讯作者: 张耀 ;  孙立贤
关键词: hydrogen storage alloy electrodes ;  AB(2)-type Laves phase alloy ;  surface modification ;  electrochemical properties ;  mechanical milling
刊名: JOURNAL OF ALLOYS AND COMPOUNDS
发表日期: 2007-10-31
DOI: 10.1016/j.jallcom.2006.12.145
卷: 446, 页:614-619
收录类别: ISTP ;  SCI
文章类型: Article
部门归属: 15
项目归属: 1504
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Materials Science, Multidisciplinary ;  Metallurgy & Metallurgical Engineering
研究领域[WOS]: Chemistry ;  Materials Science ;  Metallurgy & Metallurgical Engineering
英文摘要: In the present study, hydrogen storage composite electrodes were prepared by mechanical milling the powder mixtures of Ni-free Laves phase alloy Ti0.9Zr0.2Mn1.5Cr0.3V0.3 (AB(2)) with LaNi3.8Mn0.3Al0.4Co0.5 (AB(5)) and La0.7Mg0.25Zr0.05Ni2.975Co0.525 (AB(3.5)), respectively. X-ray diffraction (XRD) measurements found that the basic phase structure (hexagonal C14) was still maintained in TiMn2-based alloy after short-time mechanical milling with additional La-based alloys. The fine particles of La-based alloy were found dispersing over the bulk particle of TiMn2-based alloy by observations of scanning electron microscopy (SEM) with energy dispersive spectrometer (EDS). The electrochemical studies showed that the additional La-based alloys greatly improved the discharge capacity of the composite electrode. The maximum discharge capacity reached 310.4 mAh/g and 314.0 mAh/g for AB(2)-10 wt.% AB(5) and AB(2)-10 wt.% AB(3.5) electrodes, respectively, which was much higher than the maximum 48.6 mAh/g of original Ti0.9Zr0.2Mn1.5Cr0.3V0.3 alloy electrode. Electrochemical impedance spectroscopy (EIS) and cyclic voltarnmetry (CV) measurements suggests that AB(3.5)-type alloy as a surface- modifier is beneficial to the decrease of the charge-transfer reaction resistance. The mechanical milling with AB(5)-type alloy was found improving the hydrogen diffusion in the bulk of the alloy from the results of anodic polarization measurement. (C) 2007 Elsevier B.V. All rights reserved.
关键词[WOS]: METAL HYDRIDE ELECTRODES ;  LAVES PHASE ALLOYS ;  HYDROGEN STORAGE ;  PERFORMANCE ;  POWDER
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000250822900132
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/99023
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, Hailiang,Zhang, Yao,Sun, Lixian,et al. Structure and electrochemical properties of composite electrodes synthesized by mechanical milling Ni-free TiMn2-based alloy with La-based alloys[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2007,446:614-619.
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