Effect of Mn Element on the Structures and Properties of A(2)B(7)-Type La-Y-Ni-Based Hydrogen Storage Alloys

doi:10.3390/met12071122

	Effect of Mn Element on the Structures and Properties of A(2)B(7)-Type La-Y-Ni-Based Hydrogen Storage Alloys
	Deng, Anqiang 1,2,3; Luo, Yongchun 1,2; Zhou, Jianfei 1; Xie, Yunding 1; Yuan, Yuan 1; Kang, Xiaoyan 1; Shen, Bingjin 1; Zhang, Haimin 1
刊名	METALS
	2022-07-01
卷号	12 期号:7
关键词	structures and properties A(2)B(7)-type La-Y-Ni-based hydrogen storage alloys
DOI	10.3390/met12071122
英文摘要	The structures, hydrogen storage behaviors and electrochemical properties of Y0.75La0.25Ni3.5-xMnx (x = 0-0.3) alloys were analyzed by X-ray diffraction, Neutron powder diffraction, pressure-composition isotherms and electrochemical tests. All alloys have a multiphase structure. With the increase in Mn content, the Gd2Co7-type phase of the alloys gradually transforms into the Ce2Ni7-type phase; the Mn atom mainly occupies the Ni sites in the [AB(5)] subunit and the interface between the [AB(5)] and [A(2)B(4)] subunits; the V-[A2B4]/V-[AB5] continuously decreases from 1.045 (x = 0) to 1.019 (x = 0.3), which reduces the volume mismatch between [A(2)B(4)] and [AB(5)] subunits. The maximum hydrogen absorption of the series alloys increases first and then decreases, and the addition of Mn effectively promotes the hydrogen absorption/desorption performance of the alloys. The maximum discharge capacity of the alloy electrodes is closely related to their hydrogen storage capacity at 0.1 MPa and hydrogen absorption/desorption plateau pressure. The cyclic stability of all the Mn-containing alloy electrodes is improved clearly compared to that of Mn-free alloy electrodes, because the volume mismatch between the [AB(5)] and [A(2)B(4)] subunits of the alloys becomes smaller after the addition of Mn, which can improve the structural stability and reduce the corrosion of alloys during hydrogen absorption/desorption cycles. When the Mn content is between 0.1 and 0.15, the Ce2Ni7-type phase of the alloys has high abundance and the alloy electrodes exhibit excellent overall performance.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	MDPI
WOS记录号	WOS:000832149700001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/159448]
专题	材料科学与工程学院理学院
作者单位	1.Lanzhou Univ Technol, Sch 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; 3.Ningxia Univ, Sch Mech Engn, Yinchuan 750021, Ningxia, Peoples R China
推荐引用方式 GB/T 7714	Deng, Anqiang,Luo, Yongchun,Zhou, Jianfei,et al. Effect of Mn Element on the Structures and Properties of A(2)B(7)-Type La-Y-Ni-Based Hydrogen Storage Alloys[J]. METALS,2022,12(7).
APA	Deng, Anqiang.,Luo, Yongchun.,Zhou, Jianfei.,Xie, Yunding.,Yuan, Yuan.,...&Zhang, Haimin.(2022).Effect of Mn Element on the Structures and Properties of A(2)B(7)-Type La-Y-Ni-Based Hydrogen Storage Alloys.METALS,12(7).
MLA	Deng, Anqiang,et al."Effect of Mn Element on the Structures and Properties of A(2)B(7)-Type La-Y-Ni-Based Hydrogen Storage Alloys".METALS 12.7(2022).