Membrane-electrode unit for polymer electrolyte fuel cells...

H - Electricity – 01 – M

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H01M 4/94 (2006.01) H01M 4/92 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2266239

The invention relates to a membrane-electrode unit for polymer-electrolyte fuel cells. The membrane-electrode unit consists of a polymer electrolyte membrane and porous reaction layers applied to both sides comprising a catalyst and a proton-conducting polymer, a so-called ionomer. The membrane-electrode unit is characterized in that one part Al of the catalyst of the reaction layers is saturated with the ionomer and is embedded in the ionomer whereas one part A2 of the catalyst is kept free from the ionomer, where the parts Al and A2 are in a weight ratio of 1:1 to 20:1.

L'invention concerne une électrode membraneuse pour piles à combustible à électrolyte polymère. L'électrode membraneuse se compose d'une membrane à électrolyte polymère et de couches réactives poreuses appliquées sur les deux côtés, comportant un catalyseur et un polymère conducteur de protons, ainsi que d'un autre élément appelé ionomère. L'électrode membraneuse se caractérise par le fait qu'une partie (A1) du catalyseur est saturée d'ionomère et est incrustée dans l'ionomère, alors que l'autre partie (A2) du catalyseur est libre d'ionomère; ainsi, les parties A1 et A2 présentent un rapport de poids de 1/1 à 20/1.

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