Développement par PECVD de membranes conductrices protoniques de type phosphonique pour la production d’hydrogène par (photo-)électrolyse de l’eau

Abstract : The purpose of this work was to develop phosphonic-type proton conductive membranes by radio-frequency PECVD in a continuous or pulsed discharge from the single precursor dimethyl allylphosphonate. Such membranes could advantageously replace the Nafion® membrane or conventional sulfonic-type or phosphonic acid-type membranes, more classically used in PEM fuel cells and electrolysis devices. A parametric study was carried out in order to establish correlations between the properties of the films and the deposition parameters. It appears that the use of a pulsed discharge promotes better films properties, namely higher growth rate and lower density, than the continuous discharge, thus promoting proton conduction. It was also noticed that the deposits prepared in a pulsed discharge have the highest sorption and water retention capacities, which is particularly beneficial for the intended application i.e. the (photo-) electrolysis of water. Furthermore, all the plasma phosphonic membranes prepared are stable in terms of water retention and covalent network up to at least 250 °C, which ensures their use in systems able to operate up to 120 °C. Subsequently the plasma phosphonic membranes, deposited on the Nafion® as mechanical support, were integrated as electrolyte membrane into a water electrolysis cell. It turns out that plasma phosphonic membranes are competitive enough to be envisaged in the future as integral solid electrolytes in solid membrane-electrodes assemblies.
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Arnaud Kinfack Leoga. Développement par PECVD de membranes conductrices protoniques de type phosphonique pour la production d’hydrogène par (photo-)électrolyse de l’eau. Autre. Université Montpellier, 2018. Français. ⟨NNT : 2018MONTS130⟩. ⟨tel-02280200⟩

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