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

页码：209 / 214

页数：6

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