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Theses

De la réactivité des plaques bipolaires métalliques à la dégradation de la membrane : Modélisation couplée du vieillissement des piles à combustible

Abstract : The main obstacle to the large-scale development of proton exchange membrane fuel cells (PEMFC) is the existence of numerous degradation mechanisms that can occur in one or more compartments of the cell. In this context, this thesis proposes to study and model the coupling and interdependence between the corrosion of metallic bipolar plates (BPs) and the chemical degradation of the membrane considering operating conditions. Indeed, the ions produced by the corrosion of the BPs can participate in the degradation mechanisms of the membrane and the degradation products of the membrane, in particular the fluoride ions, can accelerate the localized corrosion phenomenon. A parametric experimental study of the corrosion of BPs was performed under different conditions simulating the PEMFC environment. The main parameters studied were temperature, ionic species concentrations and pH. All these results were integrated in a Look Up Table carried out with Matlab® allowing to determine the corrosion currents and to quantity the ferrous ions released. Then, the effects of these ferrous ions on the chemical degradation of the membrane by the Fenton mechanism were modeled in the MePHYSTO code (MUSES platform, a PEMFC performance simulator) under the Matlab/Simulink® platform. These results were compared with ex-situ membrane degradation tests and showed the necessity of taking into account the transport of ionic species through the cell. Thus, after integration in the model of corrosion phenomena, ionic transport and chemical degradation, numerical simulations were carried out by considering a NEDC (New European Driving Cycles) cycle and showed the interest of taking into account the coupling effects for the prediction and the quantification of the degradation of the PEMFC.
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https://tel.archives-ouvertes.fr/tel-03405710
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Submitted on : Wednesday, October 27, 2021 - 1:49:14 PM
Last modification on : Thursday, October 28, 2021 - 4:10:00 AM

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  • HAL Id : tel-03405710, version 1

Citation

Imen Elferjani. De la réactivité des plaques bipolaires métalliques à la dégradation de la membrane : Modélisation couplée du vieillissement des piles à combustible. Matériaux. Université de Lyon, 2021. Français. ⟨NNT : 2021LYSEI038⟩. ⟨tel-03405710⟩

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