Influence of diffusion through a porous film under electrode surface in chronoamperometry problems

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Abstract

In the presented work on chronoamperometry, the Cottrell model has been generalized by taking into account a thin porosity layer covering the surface of the electrode and Tafel kinetics of an electrode reaction. The effective diffusion coefficient inside a porosity layer is calculated by Bruggeman’s law. It is shown that in the quasi-stationary approximation of diffusion inside a thin porous layer, the chronoamperometry problem can be solved analytically. The obtained solution has been compared with the results of direct numerical simulations and a good agreement is shown. Limiting cases of the solution related to low and high porosity are considered.

Original languageEnglish
Pages (from-to)84-90
Number of pages7
JournalDefect and Diffusion Forum
Volume413
DOIs
StatePublished - 2021

Keywords

  • Corrosion
  • Cottrell equation
  • Diffusion in porous media
  • Electrochemical systems
  • Mass-transfer problem
  • Passive layer

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