Abstract
It is demonstrated how one should carry on with calculations of overall currents and other parameters that characterize active layers of porous electrodes in the case where polarization curves for the catalyst display two or more segments with different slopes and exchange currents. A calculation of overall currents presumes that the active layer of an electrode has an optimum thickness, over which the current reaches a maximum. The entire range of values of the cathode potential is considered, specifically, the high potentials (from a steady-state potential up to the point where there is observed an inflection in the polarization curve), the intermediate potentials (near the front surface and near the rear surface of the active layer there are realized segments of the polarization curve with different slopes), and the low potentials (throughout the entire thickness of the active layer there is observed a second segment of the polarization curve). To give an example, calculations of overall characteristics of a cathode with Nafion and platinum are performed.
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Original Russian Text © Yu.G. Chirkov, V. I. Rostokin, 2006, published in Elektrokhimiya, 2006, Vol. 42, No. 7, pp. 806–812.
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Chirkov, Y.G., Rostokin, V.I. Theory of porous electrodes: Calculation of overall cathode characteristics for the case where the polarization curve has segments with different slopes. Russ J Electrochem 42, 722–728 (2006). https://doi.org/10.1134/S1023193506070056
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DOI: https://doi.org/10.1134/S1023193506070056