Membrane-electrode unit for direct methanol fuel cells and...

H - Electricity – 01 – M

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H01M 4/88 (2006.01)

Patent

CA 2528141

The invention relates to a membrane-electrode unit for electrochemical devices, particularly for direct methanol fuel cells (DMFC), and to a method for the production thereof. The inventive multilayered MEE's for DMFC's consist of an anode gas distributor substrate, an anode catalyst layer, an ionomer membrane, a cathode catalyst layer, and of a cathode distributor substrate. The anode catalyst layer is applied to the anode gas distributor substrate, whereas the cathode catalyst layer is directly located on the membrane. This makes it possible to achieve improved output values with a simultaneous reduction in the use of precious metals.

L'invention concerne une unité membrane-électrodes pour dispositifs électrochimiques, notamment pour piles à combustible méthanol directes (en anglais, Direct methanol fuel cells, DMFC), ainsi qu'un procédé de production correspondant. Les unités membrane-électrodes (MEE) à couches multiples comprennent un substrat de répartition du gaz d'anode, une couche de catalyseur d'anode, une membrane ionomère, une couche de catalyseur de cathode et un substrat de répartition de gaz de cathode. La couche de catalyseur d'anode est appliquée sur le substrat de répartition d'anode, alors que la couche de catalyseur de cathode se trouve directement sur la membrane. Ce système permet de parvenir à de meilleures valeurs de rendement, tout en réduisant simultanément les besoins en métaux nobles requis.

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