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Chem. J. Chinese Universities ›› 1993, Vol. 14 ›› Issue (10): 1419.

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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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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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