Discharge behaviour of Mg2Ni-type hydrogen-storage alloy electrodes in 6 M KOH solution by electrochemical impedance spectroscopy

被引：38
|
作者：
Cui, N
Luan, B
Liu, HK
Dou, SX
机构：
[1] Inst. for Mat. Technol. and Mfg., University of Wollongong, Wollongong, NSW 2522, Northfields Avenue
来源：
JOURNAL OF POWER SOURCES | 1996年 / 63卷 / 02期
关键词：
magnesium alloys; yttrium; aluminium; hydrogen-storage alloys; electrochemical impedance spectroscopy;
D O I：
10.1016/S0378-7753(96)02473-1
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：
The discharge behaviour of Mg2Ni-type hydrogen-storage alloy electrodes in 6 M KOH is investigated by a.c. impedance at room temperature. Comparative measurements are also performed on an LaNi5 electrode. The rate-determining step of the discharge process for the magnesium-based hydrogen-storage alloy electrode is dependent on the alloy composition and depth-of-discharge. The unmodified Mg2Ni has a high charge-transfer and mass-transfer resistance compared with LaNi5. Additions of yttrium and aluminium in Mg2Ni reduced considerably both the resistances and, thereby, produce a remarkable improvement in discharge capacity and rate-dischargeability.
引用
收藏
页码：209 / 214
页数：6
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