Abstract
A mathematical model is suggested for charge-discharge processes taking place in an NiOOH/Ni(OH)2 electrode in conditions of cyclic voltammetry with a linearly scanned potential. The object of the analysis is a flat active material crystal of thickness h that models a particle 2h in size. The physicochemical properties of the NiOOH/Ni(OH)2 system are evaluated on the basis of notions of a homogeneous two-phase structure of the material with a variable phase concentration ratio. An equation is suggested for the relationship between the local proton activity coefficient in the crystal lattice and the state of the charge. The proton activity coefficient appears in the equilibrium potential, the charge-discharge kinetics, and the proton diffusion coefficient equations. The concept of a barrier layer governing the equilibrium potential’s hysteresis is introduced and consideration is given to the influence of the ohmic resistance of the solid phase and the effect of photon migration under the action of an electric field.
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Original Russian Text © N.D. Koshel’, M.V. Kostyrya, 2012, published in Elektronnaya Obrabotka Materialov, 2012, No. 2, pp. 86–92.
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Koshel’, N.D., Kostyrya, M.V. Cyclic voltammetry of a nickel hydroxide electrode with a homogeneous two-phase structure. Surf. Engin. Appl.Electrochem. 48, 161–166 (2012). https://doi.org/10.3103/S1068375512020093
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DOI: https://doi.org/10.3103/S1068375512020093