Kinetic study of a porous metal hydride electrode

被引:68
作者
Lundqvist, A [1 ]
Lindbergh, G [1 ]
机构
[1] Royal Inst Technol, Dept Chem Engn & Technol, KTH, SE-10044 Stockholm, Sweden
关键词
electrochemical impedance spectroscopy; metal hydride; porous electrode; particle size distribution; potential distribution;
D O I
10.1016/S0013-4686(98)00380-6
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
A physio-chemical approach has been used to describe the behaviour of a porous metal hydride electrode. The metal hydride alloy MmNi(3.6)bCo(0.8)Mn(0.4)Al(0.3). was studied. Electrochemical impedance spectroscopy (EIS) and a potential ramp were used to study the applicability of the model close to and far from its equilibrium state. An EIS model was developed and took into account a finite conductivity in the solid or liquid phase together with a distribution in characteristic diffusion length, for the hydrogen diffusion, caused by a distribution in particle size. It was shown that the impedance in the low frequency region could not be described by an average particle size, if the particle size was distributed. The EIS model was used to determine different parameters as a function of relative concentration of hydrogen. The change within the parameters could not be explained by a single phase model. The parameters were also tested by a comparison with the result of a single particle's EIS measurement, and a good agreement was found. The potential ramp showed that the present model could not fully describe the transient behaviour of the respective material, far from its equilibrium state. The reason for this could be that the expression describing the surface phase and its connection to the bulk phase is too simplified. (C) 1999 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:2523 / 2542
页数:20
相关论文
共 32 条
  • [1] DAHLQVIST G, 1974, NUMERICAL METHODS, P387
  • [2] De Levie R, 1964, ELECTROCHIM ACTA, V9, P1231, DOI DOI 10.1016/0013-4686(64)85015-5
  • [3] FRACTALS AND ROUGH ELECTRODES
    DELEVIE, R
    [J]. JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1990, 281 (1-2): : 1 - 21
  • [4] ENYO M, 1983, COMPR TREAT, V7, P244
  • [5] EFFECT OF THE STOICHIOMETRIC RATIO ON ELECTROCHEMICAL PROPERTIES OF HYDROGEN STORAGE ALLOYS FOR NICKEL-METAL HYDRIDE BATTERIES
    FUKUMOTO, Y
    MIYAMOTO, M
    MATSUOKA, M
    IWAKURA, C
    [J]. ELECTROCHIMICA ACTA, 1995, 40 (07) : 845 - 848
  • [6] ELECTROCHEMICAL IMPEDANCE AND DETERIORATION BEHAVIOR OF METAL HYDRIDE ELECTRODES
    KURIYAMA, N
    SAKAI, T
    MIYAMURA, H
    UEHARA, I
    ISHIKAWA, H
    IWASAKI, T
    [J]. JOURNAL OF ALLOYS AND COMPOUNDS, 1993, 202 : 183 - 197
  • [7] GENERAL-MODEL OF ELECTROCHEMICAL HYDROGEN ABSORPTION INTO METALS
    LASIA, A
    GREGOIRE, D
    [J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1995, 142 (10) : 3393 - 3399
  • [8] THEORETICAL APPROACH TO FARADAIC ADMITTANCE OF HYDROGEN ABSORPTION REACTION ON METAL MEMBRANE-ELECTRODE
    LIM, C
    PYUN, SI
    [J]. ELECTROCHIMICA ACTA, 1993, 38 (18) : 2645 - 2652
  • [9] LOBO VMM, 1989, HDB ELECTROLYTE SO A, P1085
  • [10] LUNDQVIST A, IN PRESS J ELECTROCH