Mathematical Model of the Local Kinetics of a Nickel Oxide Electrode
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KOSHELI, Nicolai; KOSTYRYA, M.. Mathematical Model of the Local Kinetics of a Nickel Oxide Electrode . In: Surface Engineering and Applied Electrochemistry. 2011, nr. 5(47), pp. 408-412. ISSN 1068-3755.
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Surface Engineering and Applied Electrochemistry
Numărul 5(47) / 2011 / ISSN 1068-3755 /ISSNe 1934-8002

Mathematical Model of the Local Kinetics of a Nickel Oxide Electrode

Pag. 408-412

Kosheli Nicolai, Kostyrya M.
 
 
Disponibil în IBN: 29 noiembrie 2013


Rezumat

A new mathematical model of the local kinetics characteristic E = f(i, τ) for nickel oxide electrodes NiOOH/Ni(OH)2 is presented. A flat crystal of active substance with thickness h that reconstructs a particle with a size of 2h is the sample for the studies. A mathematical model of the process is based on the conception considering the potential and polarization as a function of the concentration of the protons at the surface layer of the crystal. The polarization is considered as a sum of the concentration, activation, and ohmic components. The concept considers the coefficients of the protons activity and the proton vacancies in the crystal lattice. The potential of the electrode in the process of the discharge is determined by the changes in the surface concentration of protons. The coefficient of diffusion, the rate of the electromigration of protons, and the resistivity of the solid phase change over the thickness of the crystal in accordance with the changes in the concentration of the protons and the activity factors. The distribution of activity concentration of activity protons was determined by solving a one dimension problem of diffusive and electromigration transfer.

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