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题名: The effects of partial substitution of Cr for Ni on the electrochemical properties of Mg1.75Al0.25Ni1-xCrx (0 <= x <= 0.3) electrode alloys
作者: Wang, Mei-Han;  Zhang, Yao;  Zhang, Lian-Zhong;  Sun, Li-Xian;  Tan, Zhi-Cheng;  Xu, Fen;  Yuan, Hua-Tang;  Zhang, Tao
关键词: Mg-Al-Ni-Cr electrode alloys ;  electrochemical properties ;  solid diffusion method
刊名: JOURNAL OF POWER SOURCES
发表日期: 2006-09-13
DOI: 10.1016/j.jpowsour.2006.04.016
卷: 159, 期:1, 页:159-162
收录类别: ISTP ;  SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Electrochemistry ;  Energy & Fuels
研究领域[WOS]: Electrochemistry ;  Energy & Fuels
英文摘要: In this paper, the substitution of different amounts of Cr for Ni in the hydrogen storage electrode alloy of Mg1.75Al0.25Ni has been carried out to form quaternary Mg1.75Al0.25Ni1-xCrx (0 <= x <= 0.3) alloys by means of solid diffusion method (DM). The XRD profiles exhibited that the quaternary alloys still kept the same main phase of Mg3AlNi2 (S.G. Fd3m) as that of ternary Mg1.75Al0.25Ni alloy. The electrochemical studies found that Cr substituted quaternary alloy reached its maximum discharge capacity (165 mAh g(-1)) after 2 cycles, which was larger than that of the Mg1.75Al0.25Ni alloy (154 mAh g(-1)). Among these quaternary alloys, the Mg1.75Al0.25Ni0.9Cr0.1 electrode alloy was found possessing the highest cycling capacity retention rate. Cyclic voltammetry (CV) results and anodic polarization curves demonstrated that appropriate content (x lower than 0.1) of Cr effectively improved the reaction activity of electrode and inhibited the cycling capacity degradation to some degree. Electrochemical impedance spectroscopy (EIS) analyses indicated that the increase of Cr content would raise the polarization resistance RP on the particle surface of these quaternary alloys. (c) 2006 Elsevier B.V. All rights reserved.
关键词[WOS]: MG2NI ;  TI
语种: 英语
WOS记录号: WOS:000241012000030
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140095
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.Nankai Univ, Inst New Energy Mat Chem, Tianjin 300071, Peoples R China

Recommended Citation:
Wang, Mei-Han,Zhang, Yao,Zhang, Lian-Zhong,et al. The effects of partial substitution of Cr for Ni on the electrochemical properties of Mg1.75Al0.25Ni1-xCrx (0 <= x <= 0.3) electrode alloys[J]. JOURNAL OF POWER SOURCES,2006,159(1):159-162.
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