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Simulation of ion mass transfer processes with allowance for the concentration dependence of diffusion coefficients

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Abstract

The system of equations describing ion transport in a binary electrolyte z a-z c with allowance for the linear dependence of the diffusion coefficients on the concentration was analyzed in the framework of the phenomenological Nernst-Planck approach. The expressions are obtained that define concentration profiles of ions and conditions favorable for the limiting current caused by the achievement of the concentration of a saturated solution (in the case of the anodic reaction) and depletion of the near-electrode region in electroactive cations (in the case of the cathodic reaction). The revealed theoretical dependence of the limiting current on the volume concentration of the salt agrees with published experimental data. The voltammetric characteristics of the corresponding systems were calculated. The role of the migrational component of the ion flow is discussed.

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Authors and Affiliations

  1. Institute of Solution Chemistry, Russian Academy of Sciences, 1 ul. Akademicheskaya, 153045, Ivanovo, Russian Federation

    A. V. Noskov, S. A. Lilin & V. I. Parfenyuk

Authors
  1. A. V. Noskov
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  2. S. A. Lilin
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  3. V. I. Parfenyuk
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Additional information

Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 638–642, April, 2006.

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Noskov, A.V., Lilin, S.A. & Parfenyuk, V.I. Simulation of ion mass transfer processes with allowance for the concentration dependence of diffusion coefficients. Russ Chem Bull 55, 661–665 (2006). https://doi.org/10.1007/s11172-006-0309-9

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  • DOI: https://doi.org/10.1007/s11172-006-0309-9

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