Effect of Rare Earth Elements on the Microstructure and Electrochemical Properties of Mg-Free R-Y-Ni Based A(2)B(7)-Type Hydrogen Storage Alloys

doi:10.11862/CJIC.2018.222

	Effect of Rare Earth Elements on the Microstructure and Electrochemical Properties of Mg-Free R-Y-Ni Based A(2)B(7)-Type Hydrogen Storage Alloys
	Jiang Wan-Ting 1; Luo Yong-Chun 1,2; Zhao Lei 2; Den An-Qiang 2; Zhang Guo-Qing 1
刊名	CHINESE JOURNAL OF INORGANIC CHEMISTRY
	2018-10-10
卷号	34 期号:10 页码:1817-1825
关键词	R-Y-Ni based A(2)B(7)-type hydrogen storage alloys rare earth elements microstructure hydrogen storage electrochemical properties
ISSN号	1001-4861
DOI	10.11862/CJIC.2018.222
英文摘要	The R-Y-Ni based A(2)B(7)-type R0.3Y0.7Ni3.25Mn0.15Al10.1 (R=Y, La, Pr, Ce, Nd, Gd, Sm) alloys were prepared by vacuum arc melting and followed by annealing treatment. The effects of rare earth element R on the microstructure, hydrogen storage and electrochemical properties of the alloys were investigated systematically. XRD and SEM-EDS analysis showed that the annealed alloys mainly composed of Ce2Ni7-type main phases, minor PuNi3-type and CaCu5-type phases. The lattice constants a, c and cell volume V of the Ce2Ni7-type main phases decreased in sequence with the decreasing radius of R atoms. The annealed alloys obviously presented a hydrogen absorption/desorption platform, the maximum hydrogen storage capacities and the equilibrium hydrogen absorption pressures (P-eq) at room temperature were in the range of 1.17%similar to 1.48% (w/w) and 0.037 similar to 0.194 MPa, respectively. Electrochemical analysis showed that the electrochemical activation performance was excellent. The heterogeneity of microstructure and electrochemical oxidation corrosion of rare earth elements were main reason that affected the cycling stability of alloy electrodes. For all the alloys, the R=La alloys exhibited the highest electrochemical discharge capacity of 389.2 mAh.g(-1) and the best cyclic stability S-100=85.7% (charge/discharge after 100 cycles). The high rate discharge ability HRD900 (current density was 900 mA.g(-1)) of the alloys was 71.05%similar to 86.94% and the control step of the reaction kinetics was mainly controlled by the diffusion rate of the hydrogen atom in the alloys.
WOS研究方向	Chemistry
语种	中文
出版者	CHINESE CHEMICAL SOC
WOS记录号	WOS:000448907800006
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/32400]
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 & Engineer, 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	Jiang Wan-Ting,Luo Yong-Chun,Zhao Lei,et al. Effect of Rare Earth Elements on the Microstructure and Electrochemical Properties of Mg-Free R-Y-Ni Based A(2)B(7)-Type Hydrogen Storage Alloys[J]. CHINESE JOURNAL OF INORGANIC CHEMISTRY,2018,34(10):1817-1825.
APA	Jiang Wan-Ting,Luo Yong-Chun,Zhao Lei,Den An-Qiang,&Zhang Guo-Qing.(2018).Effect of Rare Earth Elements on the Microstructure and Electrochemical Properties of Mg-Free R-Y-Ni Based A(2)B(7)-Type Hydrogen Storage Alloys.CHINESE JOURNAL OF INORGANIC CHEMISTRY,34(10),1817-1825.
MLA	Jiang Wan-Ting,et al."Effect of Rare Earth Elements on the Microstructure and Electrochemical Properties of Mg-Free R-Y-Ni Based A(2)B(7)-Type Hydrogen Storage Alloys".CHINESE JOURNAL OF INORGANIC CHEMISTRY 34.10(2018):1817-1825.