Développement de méthodes RMN/IRM dédiées à l'étude des phénomènes de transport dans les piles à combustible à membrane échangeuse de protons

Abstract : This work focuses on the development of MRI/NMR methods dedicated to the characterization of water transport properties in a polymer membrane used in PEMFC. Radiofrequency coils are used to (1) study water self-diffusion coefficient in uniaxially stretched membranes and (2) spatially and temporally resolved measurements of the water distribution through the membrane. These measurements provide information about the influence of the polymer structure on water transport properties and also on real-time water distribution through the membrane in various humidity conditions. The water diffusion anisotropy is intimately linked to the structural order of the polymer. The steady-state and transient profiles of water content through the membrane indicate that mass transfer is limited by the interfacial resistances and mainly by the polymer relaxation during sorption
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Mathieu Klein. Développement de méthodes RMN/IRM dédiées à l'étude des phénomènes de transport dans les piles à combustible à membrane échangeuse de protons. Autre [cond-mat.other]. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0274⟩. ⟨tel-01751315⟩

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