Exhaust gas purification system for a fuel cell or a fuel...

H - Electricity – 01 – M

Patent

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H01M 8/06 (2006.01)

Patent

CA 2679184

The invention relates to a fuel cell or a fuel cell stack, wherein a means for reducing the concentration of non-reacted alcohol is disposed on the cathode exhaust gas side. Said means particularly comprises an additional electrochemical cell, to which a voltage is applied, and the at least partially non-reacted alcohol is converted by an electrochemical reaction into CO2 and hydrogen and/or water. Because the concentration of non-reacted alcohol is generally small, the loss of current required for the additional reduction reaction does not result in any notable impairment of the efficiency of the fuel cell stack. The invention is thus not limited to only direct methanol fuel cells; rather, it may be applied in an analog fashion to high-temperature fuel cells, particularly high-temperature PEM fuel cells, in which the additional electrochemical cell disposed on the cathode exhaust gas side is advantageously able to convert the remaining CO.

La présente invention concerne une pile à combustible ou un empilement de piles à combustible. Selon cette invention, un moyen permettant de réduire la concentration en alcool non transformé est prévu du côté de l'effluent gazeux de la cathode. Ce moyen est notamment composé d'une autre cellule électrochimique à laquelle une tension est appliquée et qui transforme au moins partiellement l'alcool non transformé en CO2 et en hydrogène ou en eau par le biais d'une réaction de réduction électrochimique. La concentration en alcool non transformé étant généralement faible, la perte en courant nécessaire à la réaction de réduction supplémentaire n'affecte pas de façon considérable le rendement de l'empilement de piles à combustible. Cette invention ne se limite pas aux piles à combustible au méthanol direct, mais s'applique également aux piles à combustible haute température, notamment aux piles à combustible à membrane échangeuse de protons haute température, dans lesquelles l'autre cellule électrochimique placée du côté de l'effluent gazeux de la cathode présente l'avantage de pouvoir transformer le CO résiduel.

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