Membrane electrode assemblies for direct methanol fuel cells...

H - Electricity – 01 – M

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H01M 8/10 (2006.01) H01M 4/88 (2006.01)

Patent

CA 2433172

A method of producing a membrane electrode assembly (1) for use in direct methanol fuel cells by serigraphically printing cathode catalysts (3) or anode catalysts (6) with a carbon baking layer (4, 7) onto graphite or carbon paper (5, 8), boiling impurities from these layers, and bonding the boiled, printed cathode and anode catalyst layers onto opposite sides of a polymer electrolyte membrane (2) via semi-isostatic compression in a constraint which restricts volume and lateral defamation is provided. Also provided are membrane electrode assemblies produced in accordance with this method.

L'invention concerne un procédé de production d'un ensemble d'électrode à membrane (1) destiné à être utilisé dans des piles à combustible directes au méthanol, consistant à imprimer par sérigraphie des catalyseurs cathodiques (3) ou anodiques (6) avec une couche de support carbonée (4, 7) sur du papier graphite ou carbone (5, 8), à bouillir les couches pour éliminer les impuretés, et à lier les couches cathodique, anodique et catalytique sur les côtés opposés d'une membrane électrolytique polymère (2) par compression semi-isostatique avec une contrainte permettant de réduire le volume et la déformation latérale. L'invention concerne également des ensembles d'électrodes à membranes produits selon ce procédé.

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