Electrode used in electrochemical reaction and fuel cell...

H - Electricity – 01 – M

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H01M 4/36 (2006.01) H01M 4/96 (2006.01) H01M 8/08 (2006.01) H01M 8/10 (2006.01) H01M 4/92 (2006.01)

Patent

CA 2139167

An electrode includes a porous catalyst layer having a thickness of about 0.1 mm and a porous diffusion layer having a thickness of about 1.6 mm. The catalyst layer includes a large number of agglomerate portions and a large number of gap portions which are alternately and almost parallelly arranged in a stripe-like manner. The agglomerate portion has a porous body having a porosity of 50% or more and consisting of fine carbon powder particles on which an alloy catalyst containing platinum as a main component is dispersed and carried, and an aqueous phosphoric acid solution serving as an electrolyte held in the pores of the porous body. The gap portion is formed of a large number of water-repellent PTFE fibers having a porosity of 20% or more to connect the agglomerate portions, thereby providing an electrode of a fuel cell having a higher output density than a conventional case with the same amount of catalyst.

Une électrode comprend une couche de catalyseur d'une épaisseur d'environ 0,1 mm et une couche de diffusion poreuse d'une épaisseur d'environ 1,6 mm. La couche de catalyseur comprend un grand nombre de parties agglomérat et un grand nombre de parties espace inter-électrodes qui sont disposées de manière alternée presque parallèle, à la manière d'une bande. La partie agglomérat possède un corps poreux dont la porosité est de 50 % ou plus et consiste en particules fines de poudre de carbone sur lesquelles est dispersé et porté un catalyseur d'alliage contenant du platine comme constituant principal, et une solution aqueuse d'acide phosphorique servant d'électrolyte retenue dans les pores du corps poreux. La partie espace inter-électrodes est formée d'un grand nombre de fibres de PTFE hydrofuges d'une porosité de 20 % ou plus pour relier les parties agglomérat, constituant ainsi une électrode pour une pile à combustible ayant une densité de courant plus élevée que le produit traditionnel contenant la même quantité de catalyseur.

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