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Polyélectrolytes pour piles à combustible : outils et méthodes de caractérisation

Abstract : The research works reported in the manuscript are a contribution to the study of polyelectrolytes for Proton Exchange Membrane Fuel Cells (PEMFC). They are supported by two investigation tools, i.e. the study of model molecules and accurate conductivity measurements. With regard to the material science domain, the optimization of polysulfone sulfonation procedure allows chain breakings to be reduced and even eliminated while obtaining reproducible sulfonation degrees. It is thus possible to improve the mechanical properties of the dense membrane elaborated with these polyelectrolytes before performing the tests on the MEA (Membrane Electrode Assembly). In parallel, the fonctionnalisation of microporous silicon made it possible to prepare polyelectrolytes reinforced by the mechanical strength of the silicon separator. With regard to the physicochemical and electrochemical characterizations, the model molecules, with the same functions and groups than for associated polymers, make it possible to amplify the electrochemical or thermal phenomena vs. the corresponding polymers. Thus, they simulate an accelerated ageing of the polye-lectrolytes. The development of a new conductivity measurement set allows conductivity to be obtained with a great accuracy, in a wide range of temperature and relative humidity.
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Contributor : Maréchal Manuel <>
Submitted on : Monday, April 4, 2005 - 4:58:59 PM
Last modification on : Tuesday, December 15, 2020 - 9:38:03 PM
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Maréchal Manuel. Polyélectrolytes pour piles à combustible : outils et méthodes de caractérisation. Matériaux. Institut National Polytechnique de Grenoble - INPG, 2004. Français. ⟨tel-00008949⟩

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