The effect of substitution Al for Ni on the electrochemical properties of La0.7Mg0.3Ni2.75-xAlxCo0.75 hydrogen storage alloys

被引：16

作者：

Guo, Jin ^{[1
]}

Zhang, Rui

Jiang, Wei-Qin

Li, Guang-xu

Wei, Wen-lou

机构：

[1] Guangxi Univ, Coll Phys Sci & Technol, Nanning 530004, Peoples R China

[2] Chinese Acad Sci, Int Ctr Mat Phys, Shenyang 110016, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2007年 / 429卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

hydrogen storage alloy; electrochemical properties; hydrogen storage characteristics;

D O I：

10.1016/j.jallcom.2006.04.063

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

La0.7Mg0.3Ni2.75-xAlxCo0.75 (x = 0.0-0.4) hydrogen storage alloys were prepared and the effects of partial substitution Al for Ni on the structure, electrochemical properties of the alloys were investigated systematically. In the alloys, Mg2Ni phase appears in all alloys and La (Ni, Co, Al)(5) phase with the hexagonal CaCu5-type structure replaces La(Ni,Co)(5) phase with Al substituting for Ni. The plateau pressure declines gradually and the hysteresis between the hydrogen absorption and desorption decreases with the amount of substitution Al for Ni increasing. The substitution Al for Ni can improve thermal stability for La0.7Mg0.3Ni2.75-xAlxCo0.75 (x = 0.0-0.4) alloy hydrides, slow down the capacity degradation and prolong cycle life for La0.7Mg0.3Ni2.75-xAlCo0.75 (x = 0.0-0.4) alloy electrodes. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：348 / 351

页数：4

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