Membrane-electrode assembly for polymeric membrane fuel cells

H - Electricity – 01 – M

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H01M 4/94 (2006.01) H01M 8/10 (2006.01) H01M 8/04 (2006.01)

Patent

CA 2359959

The invention is relative to a membrane-electrode assembly for fuel cells, comprising a state of the art ion-exchange polymeric membrane and by state of the art gas diffusion electrodes, whose electrochemical properties are modified through the addition of a hydrophilic component localised in correspondence of one or both the electrodic interfaces and/or one or both the external surfaces of the membrane. The such modified membrane-electrode assembly is characterised by high protonic conductivity and high efficiency even in the presence of small quantities of carbon monoxide, or of other contaminants contained in the fuel, even at temperatures as low as 100°C, being also suitable for medium temperature (100-160°C) operation at relative humidity level lower than saturation.

L'invention concerne un montage membrane-électrode destiné aux piles à combustible, comprenant une membrane polymérique échangeuse d'ions à la fine pointe de la technologie ainsi que des électrodes à diffusion de gaz ultramodernes, dont les propriétés électrochimiques sont modifiées par l'ajout d'un composant hydrophile à une ou aux deux interface(s) des électrodes, et/ou sur une surface ou sur les deux surfaces de la membrane. Le montage membrane-électrode ainsi modifié se caractérise par une conductivité protonique élevée et une grande efficacité, même en présence de petites quantités de monoxyde de carbone ou d'autres contaminants présents dans le carburant, même à des températures aussi faibles que 100 degrés Celsius, fonctionnant aussi à des températures moyennes (100 à 160 degrés Celsius) à un taux d'humidité inférieur au seuil de saturation.

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