Influence of Magnesium Content on Structure and Performance of A(2)B(7)-type RE-Mg-Ni Hydrogen Storage Alloys

doi:10.3969/j.issn.0251-0790.2012.09.028

	Influence of Magnesium Content on Structure and Performance of A(2)B(7)-type RE-Mg-Ni Hydrogen Storage Alloys
	Gao Zhi-Jie 1; Kang Long 1; Luo Yong-Chun 1,2
刊名	CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
	2012-09-10
卷号	33 期号:9 页码:2035-2042
关键词	Rare earth-Mg-Ni-based hydrogen storage alloy Magnesium Phase structure Hydrogen absorption property Electrochemical property
ISSN号	0251-0790
DOI	10.3969/j.issn.0251-0790.2012.09.028
英文摘要	La(0.8-x)Gd(0.)2Mg(x)Ni(3.1)Co(0.3)Al(0.1) (x = 0, 0. 1, 0. 15, 0. 2, 0. 25, 0. 3, 0. 4) alloys were prepared by induction melting followed by annealing treatment at 1173 K for 8 h in Ar atmosphere. Phase structure analyses,show that main phase is the Ce2Ni7-type phase and the phase abundance of Ce2Ni7- and Gd2Co7-type is 98. 8% at the lower Mg content. When x >= 0. 25, the alloys are mainly composed of A(2)B(7)-type, CaCu5-type and PuNi3-type structure. The phase abundance of the PuNi3- and CaCu5-type phase increase with the high content of Mg. The unit cell parameters of main phases decrease and hydrogen absorption plateau rises with the increasing content of Mg. Electrochemical measurements show that as the Mg content increases, the discharge capacity and cyclic stability of alloy electrodes. both first increase and then decrease. La-0.65 Gd-0.2 Mg-0.15 center dot Ni-3.1 Co-0.3 Al-0.1 alloy electrode exhibits the maximum electrochemical discharge capacity (393 mA . h/g) and the best cyclic stability(S-100 = 92. 82%). The high rate dischargeability first decreases then increases and final decreases. The appropriate Mg content improves electrochemical kinetics property of alloy electrodes.
WOS研究方向	Chemistry
语种	中文
出版者	HIGHER EDUCATION PRESS
WOS记录号	WOS:000309631300028
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/34846]
专题	材料科学与工程学院
通讯作者	Luo Yong-Chun
作者单位	1.Lanzhou Univ Technol, Dept Mat Sci & Engn, Lanzhou 730050, Peoples R China 2.Lanzhou Univ Technol, State Key Lab Gansu Adv Nonferrous Mat, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Gao Zhi-Jie,Kang Long,Luo Yong-Chun. Influence of Magnesium Content on Structure and Performance of A(2)B(7)-type RE-Mg-Ni Hydrogen Storage Alloys[J]. CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,2012,33(9):2035-2042.
APA	Gao Zhi-Jie,Kang Long,&Luo Yong-Chun.(2012).Influence of Magnesium Content on Structure and Performance of A(2)B(7)-type RE-Mg-Ni Hydrogen Storage Alloys.CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,33(9),2035-2042.
MLA	Gao Zhi-Jie,et al."Influence of Magnesium Content on Structure and Performance of A(2)B(7)-type RE-Mg-Ni Hydrogen Storage Alloys".CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE 33.9(2012):2035-2042.