Modelling carbon corrosion during a PEMFC startup: simulation of mitigation strategies

B Randrianarizafy, P Schott, M Gerard, Y Bultel - Energies, 2020 - mdpi.com
B Randrianarizafy, P Schott, M Gerard, Y Bultel
Energies, 2020mdpi.com
This paper presents a study of the carbon support corrosion and mitigation strategies
through the use of a pseudo-3D model. This model consists in coupling a 2D model along
the channel with another model perpendicular to the flow at the rib/channel scale.
Simulations offer a deeper understanding of the corrosion through the analysis of the local
conditions. Rib/channel heterogeneities show the higher degradation in the zones facing the
anodic rib. These results are validated qualitatively on literature data by analysis of SEM …
This paper presents a study of the carbon support corrosion and mitigation strategies through the use of a pseudo-3D model. This model consists in coupling a 2D model along the channel with another model perpendicular to the flow at the rib/channel scale. Simulations offer a deeper understanding of the corrosion through the analysis of the local conditions. Rib/channel heterogeneities show the higher degradation in the zones facing the anodic rib. These results are validated qualitatively on literature data by analysis of SEM images and carbon dioxide concentration at the cathode outlet. Three mitigation strategies are studied using the model. The first one consists in speeding up the hydrogen filling of the cell. The second strategy involves an external electrical resistance to create a current leak during the startup. Third, a design study of the rib/channel is performed to minimize the cathode degradation. Whatever the mitigation strategy, it consists in reducing either the duration or the magnitude of the high cathode electrode potential.
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