Fuel cell stack with recycling

Details Fuel cell stack with recycling Fuel cell stack with recycling

H - Electricity

01

M

H01M 8/04 (2006.01) H01M 8/06 (2006.01)

Patent

CA 2429415

In a direct-methanol fuel cell stack with an at least partial circulation (7, 9) of the fuel, according to the invention a means is arranged in this circulation for reducing the concentration of an undesired byproduct. This means is comprised especially of a further electrochemical cell (8) to which electric current is applied and which at least partly transforms the byproducts by an electrochemical reduction reaction again to methanol and water. Since the concentration of byproducts is small, the loss in electric current required for the additional reduction reaction has no noticeable effect on the efficiency of the fuel cell stack.

L'invention concerne un empilement de piles à combustion directe de méthanol, comprenant un circuit au moins partiel du combustible. Selon l'invention, ce circuit comporte un moyen pour réduire la concentration de produits secondaires indésirables. Ce moyen est constitué notamment d'une autre cellule électrochimique mise sous tension, qui transforme au moins en partie les produits secondaires en méthanol et en eau par réduction électrochimique. La concentration de produits secondaires étant faible, la perte de tension résultant de la réaction de réduction supplémentaire n'entraîne pas de répercutions notables sur le rendement de l'empilement.

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