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Méthodes électrochimiques pour la caractérisation des piles à combustibles de type PEM en empilement

Abstract : Proton exchange membrane (PEM) fuel cells are seen as a promising technology for environmentally friendly energy conversion but its wide spread commercialization need taking up several technological and economic challenges. First, to operate PEM fuel cells require sizeable and energy consuming surrounding systems (compressors, converters,...). Then, elements constituting the cell remain costly because with high technological value and using expensive materials (polymer membrane, catalyst layer,...). The optimization of the system and the surrounding elements is not the only challenge to take up. Indeed, durability of the membrane electrode assembly (MEA) constitutes the major barrier to commercialization of these systems for stationary or transport applications. In order to increase durability of the assemblies, a better understanding of the aging mechanisms is necessary. The first chapter of the thesis introduces a bibliographical study on PEMFC and the fundamental electrochemistry governing the system operation. The second chapter introduces materials composing the different system elements and experimental methods used for PEMFC characterization. The next chapter deals with a study on stack characterization, particularly the development of an electrochemical technique allowing active surface area measurement of the cells composing the stack. Finally, the last chapter deals with heterogeneous aging within PEMFC stacks
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Yohann Chatillon. Méthodes électrochimiques pour la caractérisation des piles à combustibles de type PEM en empilement. Autre. Université de Lorraine, 2013. Français. ⟨NNT : 2013LORR0195⟩. ⟨tel-01750449⟩



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