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Développement de membranes métalliques composites pour la purification de l'hydrogène.

Abstract : Fuel cells are able to convert chemical energy into electrical energy. There are different types of cells; are best suited to power an electric vehicle is currently the PEM (Proton Exchange Membrane). They require a supply of pure hydrogen, which can originate from in-situ reforming of fuels. The reforming products are made of a mixture of gas it is necessary to extract hydrogen for fuel cell. To separate the components of a gaseous mixture, a simple way is to use a membrane permeation. The palladium is selectively permeable to hydrogen, it is the material of choice for the realization of membrane purification of hydrogen. This work has been to develop the membrane by depositing a thin film of palladium on porous mechanical support. The technique used is that of the electroless: a palladium salt and a reducing agent are brought together and the filing is done on the catalytic surface of the substrate. The bibliographic work on this technique is followed by experimental studies support dense to understand the various factors governing the filing. In a first step, of potentiometric were conducted to determine the influence of various factors on the electrochemical potential of the bath. Then, the kinetics of weight gain of the substrate were recorded to make the link between operating conditions and the deposition efficiency obtained and its adhesion to the substrate. Then, the! s deposition of palladium were tested on substrates sintered to achieve the thin membrane deposited on porous mechanical support. These studies have helped understand the mechanisms governing the process of electroless deposition and applied to the achievement of membranes were tested for their permeation properties towards hydrogen.
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Submitted on : Tuesday, July 27, 2010 - 11:40:59 AM
Last modification on : Wednesday, March 27, 2019 - 4:18:02 PM
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  • HAL Id : pastel-00001154, version 1



Fanny Gaillard. Développement de membranes métalliques composites pour la purification de l'hydrogène.. Physique [physics]. Ecole Polytechnique X, 2003. Français. ⟨pastel-00001154⟩



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