Multi-physics modeling of startup and shutdown of a PEM fuel cell and study of the carbon support degradation : mitigation strategies and design optimization

Abstract : In order to make Proton Exchange Membrane Fuel Cells economically viable for an automotive application, durability and cost problems have to be addressed. Understanding and mitigating degradations inside the cell especially in the MEA are still the focus of several laboratories and also industrials. The several thousands startups and shutdowns that the fuel cell underwent induce severe corrosion of the carbon support. As the catalyst used is expensive, namely platinum, modeling is a great asset to comprehend and analyze this phenomenon costwise.In this work, two models were developed for modeling the transient phases that are the startup and shutdown. First a performance study is presented to validate the use of the model and to introduce the coupling between the along the channel model and the rib/channel model. Then an analysis of the phenomena occurring during the startup (and shutdown) is carried out. Phases are suggested to break down the different phenomena. The reverse-current decay mechanism, when carbon corrosion occurs, is thoroughly detailed using the model. Degradation heterogeneities are highlighted whether they are between inlet and outlet or rib and channel. Finally the model is used to emulate and suggest mitigation strategies. Degradation trends are confirmed and evaluated. New ideas like an original flow field design are tested to mitigate degradation.
Complete list of metadatas

Cited literature [134 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-02140284
Contributor : Abes Star <>
Submitted on : Monday, May 27, 2019 - 10:48:08 AM
Last modification on : Monday, July 8, 2019 - 11:26:04 AM

File

RANDRIANARIZAFY_2018_diffusion...
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-02140284, version 1

Collections

Citation

Bolahaga Randrianarizafy. Multi-physics modeling of startup and shutdown of a PEM fuel cell and study of the carbon support degradation : mitigation strategies and design optimization. Chemical and Process Engineering. Université Grenoble Alpes, 2018. English. ⟨NNT : 2018GREAI101⟩. ⟨tel-02140284⟩

Share

Metrics

Record views

111

Files downloads

34