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Journal articles
Multi-scale modeling of diffusion and electrochemical reactions in porous micro-electrodes
Abstract : A multi-scale model of diffusion/reaction at play in a porous electrode is developed and solutions to the
physico-electro-chemical coupled problem are provided. This represents a key step to progress in the
optimization of new efficient and innovative micro-electro-devices that needs to be addressed from a
chemical engineering point of view. The pore-scale model based on Fickian diffusion in the porous medium
and Nernstian layer and the electrochemical reaction governed by the Buttler-Volmer equation is
upscaled using volume averaging to obtain a macroscopic model that describes the process on an effective
equivalent medium. The validity and accuracy of the macroscopic model is successfully checked
through the comparison with direct numerical simulations of the initial microscale model for amperometry
tests. Predictions obtained from the upscaled model on the current intensity versus the scanning
potential during voltammetry reveal to be in very good agreement with experimental results reported
in the literature. These results show the capability of the macroscopic model to analyze the behavior
of the porous electrode. In particular, it provides an efficient tool to study the dependence of the current
intensity on the microstructure of the porous material and on the electrochemical parameters with the
perspective of optimizing the electrode efficiency.
https://hal.archives-ouvertes.fr/hal-03151242
Contributor : Didier Lasseux <>
Submitted on : Wednesday, February 24, 2021 - 3:44:55 PM
Last modification on : Tuesday, March 2, 2021 - 2:44:12 PM
Contributor : Didier Lasseux <>
Submitted on : Wednesday, February 24, 2021 - 3:44:55 PM
Last modification on : Tuesday, March 2, 2021 - 2:44:12 PM
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