Electrical conductive substrate

D - Textiles – Paper – 21 – H

Patent

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D21H 13/50 (2006.01) D21H 13/16 (2006.01) D21H 13/48 (2006.01) H01M 4/66 (2006.01) H01M 8/02 (2006.01) D21H 17/35 (2006.01) D21H 17/67 (2006.01)

Patent

CA 2419783

The present invention provides a flexible pyrolyzed carbon fiber matrix, suitable for use as a fuel cell electrode substrate. The product is characterized by controlled microporosity and is at least partially hydrophobic. The product is made by a continuous, high speed, high volume manufacturing process, which permits wide variability in such parameters as basis weight (50-150 gm/m2), caliper (140-400 m2 at 5 Kpa), density (0.300- 0.480 gm/cm3), and resistivity (200-1000 mOhm-cm through plane and 15-65 mOhm- cm in plane). This matrix, unlike current electrode substrates, is flexible and can be made as roll goods. Comparative testing in fuel cell applications has demonstrated that this electrode substrate performs comparably to currently available electrode substrates. A fuel cell equipped with the present electrode substrate will produce a polarization curve which is virtually the same as that produced by a fuel cell equipped with a conventional electrode substrate.

La présente invention porte sur une matrice flexible de fibres non tissées pyrolysées, appropriée pour être utilisée comme substrat d'électrode de pile à combustible. Le produit est caractérisé par une microporosité régulée et est au moins partiellement hydrophobe. Le produit est fabriqué selon un processus de fabrication continu, à haute vitesse et rendement élevé, ce qui permet de varier largement les paramètres tels que le poids de base (50-150 gm/m?2¿), l'épaisseur (140-400 m?2¿ à 5 Kpa), la densité (0,300-0,480 gm/cm?3¿) et la résistivité (200-1000 mOhm-cm dans le plan et 15-65 mOhm-cm sur le plan). Cette matrice, à la différence des substrats d'électrodes habituels, est flexible et peut être conçue comme des marchandises en rouleau. Un test comparatif des applications de pile à combustible a démontré que ce substrat d'électrode est réalisé par comparaison avec des substrats d'électrode habituellement disponibles. La pile à combustible pourvue du substrat d'électrode de cette invention a une courbe de polarisation qui est virtuellement identique à celle produite par la pile à combustible pourvue d'un substrat d'électrode traditionnel.

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