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Estimate of mass-transfer rate via Nernst model with Ohmic losses

  • Special Issue of Journal Devoted to the Problems of Mass Transfer in the Electrochemical Systems
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Abstract

The limiting-current technique, employed e.g. in electrodiffusion flow diagnostics, is based on an oversimplified electrochemical concept, which accounts only for the convective transport of depolarizers across a diffusion layer with constant bulk and wall concentrations. However, there are additional transport resistances that cannot be neglected: Faradaic resistance at surface of working electrode, and Ohmic losses in the bulk of electrolyte solution. Effect of these additional resistances is analyzed using the Nernst model of a two-electrode cell (no reference electrode). The Faradaic resistances due to electrode kinetics are considered for a single redox couple O + ne = R according to the Butler-Volmer electrode kinetics. The effect of Ohmic losses is accounted for, considering primary current distribution for a uniformly accessible circular electrode.

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Authors and Affiliations

  1. Institute of Chemical Process Fundamentals of the ASCR, v.v.i., Rozvojova 135, 16502, Prague, Czech Republic

    O. Wein

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  1. O. Wein
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Correspondence to O. Wein.

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Published in Russian in Elektrokhimiya, 2012, Vol. 48, No. 7, pp. 778–785.

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Wein, O. Estimate of mass-transfer rate via Nernst model with Ohmic losses. Russ J Electrochem 48, 704–711 (2012). https://doi.org/10.1134/S1023193512060134

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  • DOI: https://doi.org/10.1134/S1023193512060134

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