Method for inerting the anodes of fuel cells

H - Electricity – 01 – M

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H01M 8/04 (2006.01) C23F 13/02 (2006.01)

Patent

CA 2478210

A method for inerting and protecting the anodes of fuel cells, especially high- temperature fuel cells, and a fuel cell system, in which, during a shutdown, when the supply of fuel gas to the anodes is interrupted, during emergency shutdown or standby operation, water vapor is supplied to the anodes, and an external voltage is applied to the fuel cells to produce a reducing atmosphere at the anodes by electrolysis. This makes it possible to inert the anodes of the fuel cells without having to maintain a supply of a flushing or protective gas expressly for this purpose.

L'invention concerne un procédé d'inertisation et de protection des anodes de piles à combustible, en particulier de piles à combustible haute température, ainsi qu'un ensemble de piles à combustible. Selon l'invention, il est prévu que de la vapeur d'eau soit conduite aux anodes lors d'interruptions de fonctionnement, quand l'amenée de gaz combustible vers les anodes est interrompue, en cas de fonctionnement de secours ou de veille, et que, par application d'une tension externe auxpiles à combustible, on crée une atmosphère de réduction au niveau des anodes par électrolyse. Il est ainsi possible de provoquer une inertisation des anodes (2) de piles à combustible sans qu'il soit nécessaire d'utiliser un gaz de lavage ou de protection spécifiquement à cet effet.

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