Abstract
The diffusion conduction σ = di /dη (where i is the current and η is the overvoltage) in reversible system [Fe(CN)6]3–/4– is measured by the electrochemical impedance method under isothermal and nonisothermal conditions of natural convection. Platinum disk electrodes 3 mm and 20 μm in diameter are used. For a macroelectrode under isothermal conditions, σ passes through a maximum near equilibrium and tends to zero at η → 0. Under nonisothermal conditions and for a microelectrode under isothermal conditions, σ achieves a maximum near equilibrium. These data correlate with the η dependence of the diffusion layer thickness and quantitatively agree with theory.
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Rotenberg, Z.A., Lukovtseva, N.V. & Lukovtsev, V.P. Diffusion Conductivity of Electrode Processes under Conditions of Natural Convection. Russian Journal of Electrochemistry 38, 345–348 (2002). https://doi.org/10.1023/A:1015323518104
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DOI: https://doi.org/10.1023/A:1015323518104