Microstructure and electrochemical properties of LaNi4-xFeMnx (x=0-0.8) hydrogen storage alloys

被引：5
|
作者：
羊恒 [1 ]
陈云贵 [1 ]
陶明大 [1 ]
吴朝玲 [1 ]
机构：
[1] College of Materials Science and Engineering,Sichuan University
来源：
JournalofRareEarths | 2009年 / 27卷 / 05期
关键词：
hydrogen storage materials; electrochemical properties; Co-free AB5-type alloy; rare earths;
D O I：
暂无
中图分类号：
TG139.7 [];
学科分类号：
摘要：
In order to reduce the cost of LaNi5 based hydrogen storage alloys, effect of substitution of Mn for Ni on structural and electro-chemical properties of LaNi4-xFeMnx (x=0-0.8) hydrogen storage alloys was studied systematically. X-ray diffraction (XRD) and scanning electron microscope (SEM) showed that LaNi5 and La2Ni7 phases were invariably present in all alloy samples, and when x≥0.4, (Fe, Ni) phase was observed. Electrochemical studies revealed that the discharge capacity reached a maximum value of 306.4 mAh/g when x=0.2 and the cycling stability decreased with the increase of x. With the increase of Mn content, hydrogen diffusion coefficient decreased, whereas high rate discharge-ability (HRD) and exchange current density first increased slowly when x≤0.2 and then decreased markedly when x=0.8, indicating that electrochemical reaction on the surface of alloy electrodes had strong influence on kinetic property.
引用
收藏
页码：853 / 857
页数：5
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