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：

080502 ;

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

页码：853 / 857

页数：5

共 4 条

[1] Microstructures and Electrochemical Properties of Cobalt-Free LaNi4.0Al0.2Fe0.4Cu0.4-xSnx (x=0～0.4) Electrode Alloys Prepared by Casting
任江远
张羊换
冯猛
王国清
赵小龙
王新林
[J]. JournalofRareEarths, 2006, (05) : 574 - 578
[2] Characteristics of novel Co-free MlNi 4.2? x Cu 0.5 Al 0.3 Zn x （0＜ x ＜0.1） hydrogen storage alloys[J] . Wang Yijing,Yuan Huatang,Wang Genshi,Zhang Yunshi.Solid State Ionics . 2002 (3)
[3] Characteristics of a low-cobalt AB 5 -type hydrogen storage alloy obtained by a gas-atomization processing[J] . Huang Yuexiang,Zhang Hong.Journal of Alloys and Compounds . 2000 (1)
[4] Electrochemical and surface properties of iron-containing AB 5 -type alloys[J] . F. Meli,A. Züttel,L. Schlapbach.Journal of Alloys and Compounds . 1995 (1)

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