Method for operating a fuel cell, polymer-electrolyte...

H - Electricity – 01 – M

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Details

H01M 8/02 (2006.01) H01M 8/10 (2006.01) H01M 8/24 (2006.01)

Patent

CA 2423864

The invention relates to a method for operating a polymer-electrolyte membrane (PEM) fuel cell. When operating known polymer electrolyte membrane fuel cells it has to be made sure that especially the phosphoric acid does not directly contact the metal bipolar plate of the fuel cell at high temperatures. In order to avoid such a contact, a sufficiently electroconducting intermediate layer (10, 20) is interposed between the membrane electrode unit (1) and the bipolar plate (3) of the fuel cell, which prevents phosphoric acid or a mixture of phosphoric acid and water that may escape from the membrane- electrode unit (1) from reaching the bipolar plate (3). For producing the fuel cell according to the invention an at least two-layer stratified structure (10, 20) is introduced which becomes more hydrophobic and more finely pored with increasing proximity to the bipolar plate (3).

Lors du fonctionnement d'une pile à combustible à membrane électrolytique polymère (polymer electrolyte membrane fuel cell : PEMFC) connue, on doit s'attacher à éviter que de l'acide phosphorique, notamment, vienne en contact direct avec la plaque bipolaire métallique de la pile à combustible à hautes températures. La présente invention permet d'éviter ceci en ce qu'une couche intermédiaire (10, 20) suffisamment électro-conductrice est appliquée entre l'ensemble membrane-électrode (1) et la plaque bipolaire (3) de la pile à combustible. Ceci permet d'éviter qu'éventuellement de l'acide phosphorique issu de l'ensemble membrane-électrode (1) ou qu'un mélange acide phosphorique/eau n'arrive sur la plaque bipolaire (3). A cette fin, une structure stratifiée (10, 20) qui présente au moins deux couches et qui est de plus en plus hydrophobe et à pores de plus en plus fins à l'approche de la plaque bipolaire (3) est appliquée lors de la production de la pile à combustible.

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