Effect of Co content on the structure and electrochemical properties of La1.5Mg0.5Ni7-xCox (x=0, 1.2, 1.8) hydrogen storage alloys

doi:10.1016/j.jallcom.2005.10.095

	Effect of Co content on the structure and electrochemical properties of La1.5Mg0.5Ni7-xCox (x=0, 1.2, 1.8) hydrogen storage alloys
	Zhang, Faliang ; Luo, Yongchun ; Sun, Kai ; Wang, Dahui ; Yan, Ruxu ; Kang, Long ; Chen, Jianhong
	2006-11-09
发表期刊	JOURNAL OF ALLOYS AND COMPOUNDS
ISSN	0925-8388
卷号	424 期号:1-2 页码:218-224
摘要	La(1.)5Mg(0.5)Ni(7-x)Co(x) (x = 0-1.8) hydrogen storage alloys have been prepared by induction melting followed by an annealing treatment. X-ray diffraction (XRD) and electron probe microanalysis (EPMA) show that all of the alloys consist of a main phase with Ce2Ni7-type structure with small impurities, such as LaNi5-type and PuNi3-type phases. The combination of X-ray and neutron diffraction data shows that Mg atoms are located only at the Laves unit and that Co atoms are located only at the CaCu5 unit of the Ce2Ni7-type unit cell. As Co content increased, the lattice parameters and cell volume increase and the hydrides become more stable. Electrochemical analyses show that all the alloys have a large discharge capacity (above 390 mAh/g) and can be easily activated by three cycles. However, the cyclic stability of the alloy electrodes becomes worse as Co content increased, which could be mainly attributed to the distribution of Co atoms in the Ce2Ni7-type unit cell. The La1.5Mg0.5Ni7.0 alloy exhibits better cyclic stability (S-70% = 84.7) and a higher rate dischargeability (HRD900% = 92.32). Electrochemical analyses show that the control process of alloy electrode reaction is hydrogen diffusion in bulk of alloy. (c) 2006 Elsevier B.V. All rights reserved.
关键词	hydrogen storage alloy Ce2Ni7-type structure electrochemical properties Rietveld refinement
DOI	10.1016/j.jallcom.2005.10.095
收录类别	SCI
语种	英语
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000241414900041
出版者	ELSEVIER SCIENCE SA
引用统计	无
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/35654
专题	材料科学与工程学院_特聘教授组
通讯作者	Luo, Yongchun
作者单位	1.State Key Lab Nonferrous Mat, Lanzhou 730050, Peoples R China 2.Lanzhou Univ Sci & Technol, Dept Mat Sci & Engn, Lanzhou 730050, Peoples R China 3.China Inst Atom Energy, Beijing 102413, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Faliang,Luo, Yongchun,Sun, Kai,et al. Effect of Co content on the structure and electrochemical properties of La1.5Mg0.5Ni7-xCox (x=0, 1.2, 1.8) hydrogen storage alloys[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2006,424(1-2):218-224.
APA	Zhang, Faliang.,Luo, Yongchun.,Sun, Kai.,Wang, Dahui.,Yan, Ruxu.,...&Chen, Jianhong.(2006).Effect of Co content on the structure and electrochemical properties of La1.5Mg0.5Ni7-xCox (x=0, 1.2, 1.8) hydrogen storage alloys.JOURNAL OF ALLOYS AND COMPOUNDS,424(1-2),218-224.
MLA	Zhang, Faliang,et al."Effect of Co content on the structure and electrochemical properties of La1.5Mg0.5Ni7-xCox (x=0, 1.2, 1.8) hydrogen storage alloys".JOURNAL OF ALLOYS AND COMPOUNDS 424.1-2(2006):218-224.

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