Method and apparatus for operating an electrochemical fuel...

H - Electricity – 01 – M

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

Patent

CA 2316380

A method and apparatus is provided for operating an electrochemical fuel cell with periodic momentary fuel starvation at the anode, e.g. interrupting the supply of said fuel, or periodically introducing pulses of a fuel-free fluid into the fuel stream. It is believed that such momentary periodic fuel starvation conditions cause the anode potential to increase, resulting in the oxidation and removal of electrocatalyst poisons from the anode electrocatalyst and improved fuel cell performance. In a preferred method, while successive localized portions of the fuel cell anode are momentarily periodically fuel starved, the remainder of the fuel cell anode remains electrochemically active and saturated with fuel such that the fuel cell is continually available to generate power.

L'invention concerne un procédé et un appareil permettant de faire fonctionner une cellule électrochimique à combustible en coupant périodiquement et momentanément l'alimentation en combustible au niveau de l'anode, par exemple en interrompant l'apport de combustible, ou en introduisant périodiquement dans le flux de combustible des impulsions d'un fluide sans combustible. Ces coupures d'alimentation momentanées et périodiques sont supposées améliorer le potentiel de l'anode, ayant ainsi pour effet d'oxyder et de supprimer les poisons électrocatalytiques de l'électrocatalyseur de l'anode et d'améliorer la performance de la cellule à combustible. Dans un procédé préféré, alors que l'alimentation en combustible de parties successives localisées de l'anode de la cellule à combustible est momentanément et périodiquement coupée, le reste de l'anode de l'élément à combustible demeure électrochimiquement actif et saturé de combustible, de sorte que la cellule à combustible continue de produire de l'énergie.

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