Abstract
An expression for the diffusion impedance in conditions of natural convection, when the diffusion layer thickness depends on the redox pair concentration, is obtained. The theory predicts a decrease in the steady-state diffusion resistance R dby 1.25 times and a change in the coordinates of the extremum in an impedance spectrum and in the dimensionless R dfrequency at this point (3.2 instead of 2.5) as compared to the classical theory, which is confirmed by experimental data for a reversible [Fe(CN)6]3–/4–system. The theoretical results are employed for correct determination of the concentration coefficient of the solution density.
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Rotenberg, Z.A. Diffusion Impedance in Natural Convection Conditions. Russian Journal of Electrochemistry 37, 1283–1286 (2001). https://doi.org/10.1023/A:1013235712917
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DOI: https://doi.org/10.1023/A:1013235712917