高等学校化学学报

高等学校化学学报 ›› 1993, Vol. 14 ›› Issue (10): 1419.

• 研究论文 • 上一篇    下一篇

贮氢电极的电化学研究(Ⅱ)——贮氢电极的交流阻抗研究

蔡称心1, 赵东江2, 王宝忱2   

  1. 1. 南京大学化学系, 南京 210008;
    2. 中国科学院长春应用化学研究所
  • 收稿日期:1992-11-27 修回日期:1993-06-17 出版日期:1993-10-24 发布日期:1993-10-24
  • 通讯作者: 蔡称心, 男, 27岁, 博士研究生.
  • 作者简介:蔡称心, 男, 27岁, 博士研究生.
  • 基金资助:

    国家自然科学基金

A Electrochemical Study on the Hydrogen Storage Electrode(Ⅱ)—Impedance Study of the Hydrogen Storage Electrode

CAI Chen-Xin1, ZHAO Dong-Jiang2, WANG Bao-Chen2   

  1. 1. Department of Chemistry, Nanjing University, Nanjing, 210008;
    2. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun
  • Received:1992-11-27 Revised:1993-06-17 Online:1993-10-24 Published:1993-10-24

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摘要： 用交流阻抗的方法对贮氢电极进行了研究.实验表明,贮氢电极的交流阻抗图由两个半圆组成.高频区半圆对应于电化学反应,低频区半圆对应于氢原子在贮氢合金表面的吸附过程.低频区的半圆受电极活化次数和放电深度的影响.活化次数越多、放电时间越长,低频区半圆越小.提出了贮氢电极的等效电路图,对这些实验结果作出了解释.

关键词: 贮氢电极, Ni/MH电池, 交流阻抗

Abstract: In this paper, the hydrogen storage electrode was studied by A.C.impedance method.The A.C.impedance experiment indicated that MH(Metal Hydride) electrode process is a multi-step process consisting of charge transfer and hydrogen atom adsorption process.The A.C.impedance diagram shows two semi-circles.The high frequency one corresponds to the charge transfer process and the low frequency one corresponds to the hydrogen atom adsorption process.The low frequency semi-circle is affected by MHelectrode charge-discharge cycles number and charge-discharge state.With the increasing charge-discharge number and the depth of discharge state, the low frequency semi-circle becomes smaller.To explain the A.C.impedance diagram, an equivalent circuit of hydrogen stroage electrode was suggested.

Key words: Hydrogen storage electrode, Ni/MH battery, A.C.impedance

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