Hydrogen Storage and Electrochemical Properties of the Mg-free A(2)B(7)-type La1-xYxNi3.25Mn0.15Al0.1 Alloys with Superlattice Structure

doi:10.7503/cjcu20180169

CORC > 兰州理工大学 > 兰州理工大学 > 省部共建有色金属先进加工与再利用国家重点实验室

	Hydrogen Storage and Electrochemical Properties of the Mg-free A(2)B(7)-type La1-xYxNi3.25Mn0.15Al0.1 Alloys with Superlattice Structure
	Zhao Lei 1; Luo Yongchun 1,2; Deng Anqiang 1; Jiang Wanting 1
刊名	CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
	2018-09-10
卷号	39 期号:9 页码:1993-2002
关键词	A(2)B(7)-type La-Y-Ni based hydrogen storage alloy Microstructure and phase structure Hydrogen storage behavior Electrochemical property
ISSN号	0251-0790
DOI	10.7503/cjcu20180169
英文摘要	The new Mg-free A(2)B(7)-type La1-xYxNi3.25Mn0.15Al0.1(x = 0-1.00) annealed alloys with superlattice structure were prepared by vacuum arc melting and heat treatment(950 degrees Cx10 h). The influences of Y element on the microstructure, hydrogen storage behavior and electrochemical performance of annealed alloys were investigated systematically. The results show that the main phase of all the annealed alloys is Ce2Ni7-type. With the increase of Y content, phase abundance of the Ce2Ni7-type phase increases firstly and then decreases, meanwhile the cell volumes decreases gradually. The x = 0-0.25 alloys are easy to form hydrogen. induced amorphization(HIA), resulting in the disappearance of the plateau of pressure. composition. temperature (PCT) curves. When x >= 0.50, the alloys can effectively avoid the HIA, the PCT curves obviously present an approximately single platform, the maximum hydrogen storage capacity and the plateau pressure of hydrogenation is in the range of 1.418%-1.48%(mass fraction) and 0.026-0.097 MPa, respectively. Therefore, the hydrogen storage performance has been greatly improved. The electrochemical measurement results show that the x = 0.50-0.85 alloys exhibit the high discharge capacity of 350.4-381 mA . h/g and the cyclic stability of 52%-85% after 100 cycles, and the alloy with x = 0.67-0.75 has good hydrogen storage and comprehensive electrochemical properties. The high rate discharge ability(HRD900) of the alloys is 64.5%-85.7% and reaction kinetics of the electrode is mainly controlled by the diffusion rate of the hydrogen atom in body phase of the alloys.
资助项目	National Natural Science Foundation of China[51761026]
WOS研究方向	Chemistry
语种	中文
出版者	HIGHER EDUCATION PRESS
WOS记录号	WOS:000453439600019
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/32455]
专题	省部共建有色金属先进加工与再利用国家重点实验室材料科学与工程学院
通讯作者	Luo Yongchun
作者单位	1.Lanzhou Univ Technol, Dept Mat Sci & Engn, Lanzhou 730050, Gansu, Peoples R China 2.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Zhao Lei,Luo Yongchun,Deng Anqiang,et al. Hydrogen Storage and Electrochemical Properties of the Mg-free A(2)B(7)-type La1-xYxNi3.25Mn0.15Al0.1 Alloys with Superlattice Structure[J]. CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,2018,39(9):1993-2002.
APA	Zhao Lei,Luo Yongchun,Deng Anqiang,&Jiang Wanting.(2018).Hydrogen Storage and Electrochemical Properties of the Mg-free A(2)B(7)-type La1-xYxNi3.25Mn0.15Al0.1 Alloys with Superlattice Structure.CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,39(9),1993-2002.
MLA	Zhao Lei,et al."Hydrogen Storage and Electrochemical Properties of the Mg-free A(2)B(7)-type La1-xYxNi3.25Mn0.15Al0.1 Alloys with Superlattice Structure".CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE 39.9(2018):1993-2002.