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Mécanisme de conduction protonique au sein de membranes hybrides pour piles à combustible

Abstract : Proton exchange membrane fuel cell (PEMFC) has recently received increasing attention as a clean renewable power source due to its high operational efficiency and minimal environmental impact. The currently well-developed PEMFC technology is based on perfluorosulfonic polymers acid membranes as electrolyte. The reference membrane is Nafion due to their excellent chemical, mechanical, and thermal stability. However, Nafion presents several drawbacks as high cost and relative low operational temperatures. An alternative to replace commercials membranes is the development of organic-inorganic hybrid membranes for fuel cell applications. The advantage of these membranes is the decoupling of the proton transport from the mechanical properties. This hybrid membrane combines the intrinsic physical and chemical properties of both the inorganic and organic components allowing desirable properties. The swelling of the membrane can be adjusted via the composition of the membrane. A new hybrid membrane composed of silica and polymer PVDF-HFP is synthesised by combining sol gel chemistry and electrospinning. The association between the sol gel process and electrospinning permits the creation of an inorganic network within the polymer membrane, and morphological control to tune the proton pathway. This process recreated the nanoseparation observed in hydrated Nafion while being in dependent of water quantity. This organisation is strongly correlated with high conductivity of nafion. These news membranes are made of polymer fibbers surrounded by a functionalized (-SO3H) inorganic network. This microstructure conduces to membranes with conductivity values comparable to Nafion. To optimize the sol-gel chemistry and the electrospinning parameters, there is a need to understand proton mechanisms in these multiscale materials. Several characterisation techniques are used to explain the microstructure and to understand the link with conductivity values.
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Submitted on : Tuesday, April 28, 2015 - 10:28:05 AM
Last modification on : Monday, December 14, 2020 - 9:44:10 AM
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  • HAL Id : tel-01146291, version 1


Leslie dos Santos. Mécanisme de conduction protonique au sein de membranes hybrides pour piles à combustible. Matériaux. Université Pierre et Marie Curie - Paris VI, 2014. Français. ⟨NNT : 2014PA066612⟩. ⟨tel-01146291⟩



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