Separator for fuel cell, process for producing the same, and...

H - Electricity – 01 – M

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Details

H01M 8/02 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2608628

The present invention provides a separator for a fuel cell comprising a resin and a conductive material as constituting components, and sulfonic acid groups imparted to at least one portion at the surface of gas channels by a treatment using a sulfuric acid-containing gas, wherein the resin and the sulfonic acid groups, which are on the surface of the gas channels, are bonded, and a ratio of sulfur atoms in the sulfonic acid groups at the surface of the gas channels as determined by energy-dispersive X-ray spectroscopy is in a range from 0.1 to 4.0 at%, and a method for producing the separator. The separator for a fuel cell of the present invention is excellent in the wettability to water, since sulfonic acid groups are imparted to the resin at the surface of gas channels in the sulfuric acid-containing gas.

Séparateur pour piles à combustible qui comprend une résine et un matériau conducteur comme composants constituants, et comporte des canaux de gaz, au moins une partie de la surface des canaux de gaz comportant des groupes sulfo incorporés par un traitement au gaz d'acide sulfurique. Le séparateur selon l~invention est caractérisé en ce que la résine présente sur la surface des canaux de gaz du séparateur est liée aux groupes sulfo et en ce que la proportion atomique de soufre des groupes sulfo présents à la surface des canaux de gaz déterminée par spectroscopie à rayons X disperseurs d~énergie est de 0,1-4,0%. Ce séparateur pour piles à combustible présente une excellente mouillabilité à l~eau en raison de l'implantation des groupes sulfo dans la résine présente sur la surface des canaux de gaz du séparateur par un traitement avec un gaz contenant de l~acide sulfurique.

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