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题名: The improved electrochemical properties of novel La-Mg-Ni-based hydrogen storage composites
作者: Chu, Hai-Liang;  Qiu, Shu-Jun;  Sun, Li-Xian;  Zhang, Yao;  Xu, Fen;  Jiang, Tao;  Li, Wei-Xue;  Zhu, Min;  Hu, Wang-Yu
关键词: Ni/MH batteries ;  la-mg-ni hydrogen storage alloy ;  composite ;  electrochemical properties ;  electrochemical kinetics ;  corrosion behaviors
刊名: ELECTROCHIMICA ACTA
发表日期: 2007-08-01
DOI: 10.1016/j.electacta.2007.04.097
卷: 52, 期:24, 页:6700-6706
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Electrochemistry
研究领域[WOS]: Electrochemistry
英文摘要: In the present study, a novel alloy composite has been synthesized by ball milling nonstoichiometric AB(3)-type La(0.7)Mg(0.3)Ni(3.5) alloy with Ti(0.17)Zr(0.08)V(0.35)Cr(0.1)Ni(0.3) alloy in order to improve the cyclic stability and other electrochemical properties of La(0.7)Mg(0.3)Ni(3.5) alloy electrode. The phase structure, morphology and electrochemical performances of the composite have been investigated systematically. From X-ray diffraction (XRD) patterns, it can be found that the La(0.7)Mg(0.3)Ni(3.5) and Ti(0.17)Zr(0.08)V(0.35)Cr(0.1)Ni(0.3) alloys still retain their respective phase structures in the composite. Electrochemical studies show that the cyclic stability of the composite electrode is noticeably improved after 100 charge-discharge cycles in comparison with single La(0.7)Mg(0.3)Ni(3.5) alloy electrode due to enhanced anti-corrosion performance in the alkaline electrolyte. The discharge capacity retention rate C(100)/C(max) of composite electrode is 62.3%, which is much higher than that of the La(0.7)Mg(0.3)Ni(3.5) alloy electrode, although the maximum discharge capacity of the former decreases moderately. Both electrochemical impedance spectra (EIS) and linear polarization (LP) studies indicate that the electrochemical kinetics of the composite electrode is also improved. The charge-transfer resistance (R(ct)), the polarization resistance (R(p)) and the exchange current density (I(0)) of the composite electrode are 160.2 m Omega, 129.5 m Omega and 201.6 mA/g, respectively, which are superior to those of the La(0.7)Mg(0.3)Ni(3.5) alloy electrode. (c) 2007 Elsevier Ltd. All rights reserved.
关键词[WOS]: METAL HYDRIDE ELECTRODES ;  SOLID-SOLUTION ALLOYS ;  PD SUBSTITUTION ;  IMPEDANCE ;  CAPACITY ;  MN ;  CO
语种: 英语
WOS记录号: WOS:000248783300015
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140738
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.Jinan Univ, Inst Nanochem, Dept Chem, Guangzhou 510632, Peoples R China
4.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lan Catalysis, Dalian 116023, Peoples R China
5.Chinese Acad Sci, Dalian Inst Chem Phys, Ctr Theoret & Computat Chem, Dalian 116023, Peoples R China
6.S China Univ Technol, Sch Mech Engn, Guangzhou 510641, Peoples R China
7.Hunan Univ, Dept Appl Phys, Changsha 410082, Peoples R China

Recommended Citation:
Chu, Hai-Liang,Qiu, Shu-Jun,Sun, Li-Xian,et al. The improved electrochemical properties of novel La-Mg-Ni-based hydrogen storage composites[J]. ELECTROCHIMICA ACTA,2007,52(24):6700-6706.
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