Method for deposition of a catalyst

H - Electricity – 01 – M

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

Patent

CA 2430515

The invention relates to a method for deposition of a catalyst, in particular a method for coating a membrane electrode unit (MEA) for a fuel cell. Said method requires no external electrical field as usual for conventional galvanic techniques. The support for the catalytic layer is first capacitively charged (pseudocapacitance). When brought into contact with an electrolyte solution, comprising the catalyst in the form of dissolved metal salt ions, an in-situ reduction (deposition) of the metal salt ions to give metallic catalyst occurs at the site of contact.

Procédé de précipitation d'un catalyseur, en particulier procédé permettant d'appliquer une couche sur une unité membrane-électrode pour une pile à combustible. Ledit procédé ne nécessite pas de champ électrique externe, comme c'est le cas pour les procédés galvanoplastiques. Le support de la couche de catalyseur est d'abord chargé de manière capacitive (pseudocapacité). Lors du contact du support avec une solution électrolytique qui contient le catalyseur sous forme d'ions de sels métalliques dissous, il se produit, au niveau des sites de contact, une réduction (précipitation) in situ des ions de sels métalliques en catalyseur métallique.

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