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Étude physico-chimique de liquides ioniques protoniques pour piles à combustible PEMFCs

Abstract : Ionic liquids can replace water in the electrolytes of PEMFCs systems operating at 130°C. Ionic liquids resulting from the neutralization of aliphatic amines by trifluoromethanesulfonic acid show that the melting point depends on several criteria, nature of the anion, nature of the substitutions on the amine. Moreover, the majority of these salts are thermally stable upto 400°C. The study by cyclic voltammetry showed that the amines and the salts (HNR3+, A-) are stable towards very oxidative step (i. e. > 1.9 V/HSE), compatible for their use in fuel cell. In the other hand, the best conductivity behaviour is observed for salts resulting from dissymmetric amines/ trifluoromethanesulfonic acid association. The conductivities at 130°C lie between 5 and 45 The incorporation of these compounds within Nafion shows good compatibility PIL/ Nafion. However, the plastizing effect of PIL in the polymer reduces the Nafion mechanical properties. The conductivities are also dramatically reduced by a factor of 5 in the best cases.
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Contributor : Maha Hanna <>
Submitted on : Tuesday, August 31, 2010 - 2:23:11 PM
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  • HAL Id : tel-00442670, version 2



Maha Hanna. Étude physico-chimique de liquides ioniques protoniques pour piles à combustible PEMFCs. Matériaux. Institut National Polytechnique de Grenoble - INPG, 2008. Français. ⟨tel-00442670v2⟩



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