Effect of Mixed Rare Earth Elements on Structural and Electrochemical Properties of A(2)B(7)-Type Hydrogen Storage Alloys

	Effect of Mixed Rare Earth Elements on Structural and Electrochemical Properties of A(2)B(7)-Type Hydrogen Storage Alloys
	Li Jing 1; Luo Yong-Chun 1,2; Zhang Guo-Qing 1; Mei Xing-Zhi 1; Kong Ling-Bin 1,2; Kang Long 1
刊名	CHINESE JOURNAL OF INORGANIC CHEMISTRY
	2014-10-10
卷号	30 期号:10 页码:2270-2278
关键词	R-Mg-Ni based hydrogen storage alloys the mixed rare earth microstructure electrochemical properties
ISSN号	1001-4861
英文摘要	A(2)B(7)-type La0.83-0.5x (Pr0.1Nd0.1Sm0.1Gd0.2)(x)Mg0.17Ni3.1Co0.3Al0.1(x=0 similar to 1.66) hydrogen storage alloys were prepared by induction melting method and annealed at 1 173 K in He+Ar atmosphere. The effect of the partial substitution of mixed rare earth for La on the structure and electrochemical properties of the alloys was investigated by XRD, SEM and electrochemical measurement. Phase structure analyses showed that the annealed alloys mainly consisted of Ce2Ni7-type and Gd2Co7-type phases accompanied by minor CaCu5-type and PuNi3-type phases and the influence of the substituted mixed rare earth content x in alloys was great on the phase constitution and structure. With the increase of x value, the main phase abundance of A(2)B(7)-type (Ce2Ni7-type and Gd2Co7-type) gradually increased and the unit cell parameters of the main phase decreased. The partial substitution of the mixed rare earth for La beneted the formation of Gd2Co7-type phase, indicating that the atoms with smaller radius favored the formation of the Gd2Co7-type phase. The electrochemical measurement results showed that the activation performance was influenced little but the discharge capacity and the cycle stability of the alloys were all first increased and then decreased with the increase of x value. When x value was equal to 0.4, the system exhibited the maximum electrochemical discharge capacity (389.8 mAh.g(-1)) and the best cyclic stability (S-100 = 92.82%). The high rate discharge ability of alloys presented an increasing trend with the increase of x value. The appropriate substitution of the mixed rare earth for La improved obviously comprehensive electrochemical properties of the alloy electrodes.
WOS研究方向	Chemistry
语种	中文
出版者	CHINESE CHEMICAL SOC
WOS记录号	WOS:000345676000005
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/34266]
专题	材料科学与工程学院省部共建有色金属先进加工与再利用国家重点实验室
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 Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Li Jing,Luo Yong-Chun,Zhang Guo-Qing,et al. Effect of Mixed Rare Earth Elements on Structural and Electrochemical Properties of A(2)B(7)-Type Hydrogen Storage Alloys[J]. CHINESE JOURNAL OF INORGANIC CHEMISTRY,2014,30(10):2270-2278.
APA	Li Jing,Luo Yong-Chun,Zhang Guo-Qing,Mei Xing-Zhi,Kong Ling-Bin,&Kang Long.(2014).Effect of Mixed Rare Earth Elements on Structural and Electrochemical Properties of A(2)B(7)-Type Hydrogen Storage Alloys.CHINESE JOURNAL OF INORGANIC CHEMISTRY,30(10),2270-2278.
MLA	Li Jing,et al."Effect of Mixed Rare Earth Elements on Structural and Electrochemical Properties of A(2)B(7)-Type Hydrogen Storage Alloys".CHINESE JOURNAL OF INORGANIC CHEMISTRY 30.10(2014):2270-2278.