TY - JOUR
T1 - Influence of diffusion through a porous film under electrode surface in chronoamperometry problems
AU - Bograchev, Daniil A.
N1 - Publisher Copyright:
© 2021 Trans Tech Publications Ltd, Switzerland.
PY - 2021
Y1 - 2021
N2 - 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.
AB - 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.
KW - Corrosion
KW - Cottrell equation
KW - Diffusion in porous media
KW - Electrochemical systems
KW - Mass-transfer problem
KW - Passive layer
UR - http://www.scopus.com/inward/record.url?scp=85121632159&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/DDF.413.84
DO - 10.4028/www.scientific.net/DDF.413.84
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AN - SCOPUS:85121632159
SN - 1012-0386
VL - 413
SP - 84
EP - 90
JO - Defect and Diffusion Forum
JF - Defect and Diffusion Forum
ER -