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题名: Electrochemical hydrogen storage properties of La0.7Mg0.3Ni3.5-Ti0.17Zr0.08V0.35Cr0.1Ni0.3 composites
作者: Chu, Hai-Liang1, 2;  Qiu, Shu-Jun1, 2;  Sun, Li-Xian1;  Zhang, Yao1;  Xu, Fen1;  Zhu, Min3;  Hu, Wang-Yu4
关键词: composite electrode material ;  hydrogen storage ;  electrochemical reactions ;  cyclic stability ;  electrochemical kinetics
刊名: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
发表日期: 2008
DOI: 10.1016/j.ijhydene.2007.10.014
卷: 33, 期:2, 页:755-761
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: For further improving the electrochemical properties of nonstoichiometric AB(3)-type La0.7Mg0.3Ni3.5 alloy as negative electrode of Ni-MH battery, its related composites La0.7Mg0.3Ni3.5-xwt% Ti0.17Zr0.08V0.35Cr0.1Ni0.3 (x = 5, 10, 25, 40) are prepared by ball milling method. It is found that all these composites are mainly composed of (LaMg)Ni-3 and LaNi5 phases according to XRD patterns. When x <= 25, the V-based solid solution BCC phase and C14 Laves phase in Ti0.17Zr0.08V0.35Cr0.1Ni0.3 alloy are not detectable. As x further increases to 40wt%, however, these two phases appear in XRD pattern. Electrochemical studies show that the maximum discharge capacity of these electrodes decreases slightly from 348.5 mAh/g (x = 5) to 335.2 mAh/g (x = 40), while the cyclic capacity retention rate of composite electrodes is significantly improved from 29.7% (x = 5) to 63.0% (x = 40) after 70 charge-discharge cycles. This improvement of cyclic life can be ascribed to the enhanced anti-corrosion performance of composite electrode in alkaline solution. Moreover, the electrochemical kinetics properties, including the charge-transfer resistance R-ct, the polarization resistance R-p, the exchange cur-rent density I-0, the limiting current density I-L and the hydrogen diffusion coefficient D, of the composite electrodes were retarded first with x increasing from 5 to 25 and then improved when x reaches to 40. (C) 2007 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
关键词[WOS]: METAL HYDRIDE ELECTRODES ;  SOLID-SOLUTION ALLOYS ;  NI ;  TI ;  SUBSTITUTION ;  LA ;  MICROSTRUCTURE ;  CAPACITY ;  MN ;  AL
语种: 英语
WOS记录号: WOS:000253791300033
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140831
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.S China Univ Technol, Sch Mech Engn, Guangzhou 510641, Peoples R China
4.Hunan Univ, Dept Appl Phys, Changsha 410082, Peoples R China

Recommended Citation:
Chu, Hai-Liang,Qiu, Shu-Jun,Sun, Li-Xian,et al. Electrochemical hydrogen storage properties of La0.7Mg0.3Ni3.5-Ti0.17Zr0.08V0.35Cr0.1Ni0.3 composites[J]. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,2008,33(2):755-761.
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