Suboxide fuel cell catalyst for enhanced reformate tolerance

H - Electricity – 01 – M

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H01M 4/92 (2006.01) B01J 23/56 (2006.01) B01J 23/648 (2006.01) B01J 23/652 (2006.01) B01J 37/34 (2006.01) H01M 4/90 (2006.01)

Patent

CA 2395833

The present invention provides fuel cell electrode catalysts comprising alternating platinum-containing layers and layers containing suboxides of a second metal, where the catalyst demonstrates an early onset of CO oxidation. Preferred second metals are selected from the group consisting of Group IIIb metals, Group IVb metals, Group Vb metals, Group VIb metals and Group VIIb metals, most preferably Ti, Ta, W and Mo. The present invention additionally provides methods of making such catalysts, preferably by alternate deposition of platinum and second metals in the presence of substoichiometric amounts of gaseous oxygen.

La présente invention concerne des catalyseurs d'électrode de piles à combustible constitués de couches à base de platine alternant avec des couches à base de sous-oxydes d'un métal ajouté, le catalyseur révélant un début précoce d'oxydation du cobalt. Des métaux ajoutés préférés sont sélectionnés dans le groupe constitué par des métaux des Groupes IIIb, IVb, Vb, VIb et VIIb, de préférence Ti, Ta, W et Mo. L'invention concerne en outre des procédés de production desdits catalyseurs, de préférence par dépôt alterné de platine et de métaux ajoutés, en présence d'une quantité sous-stoechiométrique d'oxygène gazeux.

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