Effects of Boron Addition on Structural and Electrochemical Properties of La-Mg-Ni-Co System Hydrogen Storage Electrode Alloys

He Miao; Mingxia Gao; Danfeng Li; Feng Xu; Yan Lin; Kai Zhong; Hongge Pan

doi:10.1016/s1875-5372(10)60017-3

Author(s)

He Miao
Mingxia Gao
Feng Xu
Yan Lin
Kai Zhong
Hongge Pan

Detail(s)

Original language	English
Pages (from-to)	193-197
Journal / Publication	Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
Volume	38
Issue number	2
Publication status	Published - Feb 2009
Externally published	Yes

Link(s)

DOI	DOI https://doi.org/10.1016/s1875-5372(10)60017-3 Final Published version
	Check@CityULib
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-65149086537&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(7aa53187-8d1c-4913-a36a-9b5e4d64db03).html

Abstract

The structural and electrochemical properties of La_0.7Mg_0.3 Ni_2.65Co_0.75Mn_0.1Al_0.2 B_x(x=0-0.08) hydrogen storage electrode alloys were investigated systematically. The results from XRD show that all of the alloys consist of a (La, Mg)Ni₃ phase and a LaNi₅ phase. With the increase of B content, the abundance of the (La, Mg)Ni₃ phase increases, accordingly that of the LaNi₅ phase decreases, and the cell volumes of the two phases decrease. Electrochemical studies indicate that B addition can effectively improve the high rate dischargeability (HRD) of the alloy electrode, and the optimal value of HRD₁₀₀₀ reaches 57.1% as x being 0.04. With the addition of small amount of B, the cycling stability and activation properties of the alloy electrodes keep almost unchanged, but the maximum discharge capacity (C_max) decreases. In addition, the electrochemical kinetics investigations including the linear polarization and anodic polarization were also performed in detail.