Electrochemical impedance and cyclic voltammetry characterization of a metal hydride electrode in alkaline electrolytes

被引：14
|
作者：
Li, Xiaofeng [1 ]
Dong, Huichao [1 ]
Zhang, Aiqin [1 ]
Wei, Yanwei [1 ]
机构：
[1] Zhengzhou Univ Light Ind, Dept Chem & Mat Engn, Zhengzhou 450005, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2006年 / 426卷 / 1-2期
关键词：
metal hydride electrode; electrochemical impedance spectroscopy; cyclic voltarnmetry; alkaline electrolytes; absorption/desorption; self-discharge;
D O I：
10.1016/j.jallcom.2006.01.079
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 electrochemical characterization of a MmNi(3.55)Co(0.75)Al(0.2)Mn(0.5) metal hydride electrode in two alkaline electrolytes (NaOH or KOH) is reported. The results from both electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) show that absorption/desorption of H atoms at the metal-electrolyte interface is markedly suppressed by using a NaOH electrolyte instead of a KOH electrolyte. This results in a significant reduction of the self-decomposition rate of the negative active material and thus leads to an improvement in the self-discharge performance of nickel-metal hydride (Ni-MH) batteries. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：93 / 96
页数：4
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