Improved proton exchange membrane fuel cell

H - Electricity – 01 – M

Patent

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Details

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

Patent

CA 2542383

A fuel cell system with a proton exchange membrane (12). There is a cathode catalyst layer (16) overlying the first face of the proton exchange membrane, and a cathode diffusion layer (20) overlying the cathode catalyst layer. There is an anode catalyst layer (14) overlying the second face of the proton exchange membrane, and an anode diffusion layer (18)overlying the anode catalyst layer. The cathode diffusion layer has a water vapor permeance of less than about 3 x 10-4 g/(Pa s m2) at 80~C and 1 atmosphere. The invention also relates to cathode diffusion layers for fuel cell systems.

L'invention concerne un système de pile à combustible à membrane d'échange protonique. Une couche catalytique de cathode est établie sur la première face de la membrane, et une couche de diffusion de cathode est établie sur la couche catalytique de cathode. Une couche catalytique d'anode est établie sur la seconde face de la membrane, et une couche de diffusion d'anode est établie sur la couche catalytique d'anode. La couche de diffusion de cathode comporte une perméance à la vapeur d'eau inférieure à environ 3 x 10-4 g/(Pa s m2) à 80 °C et 1 atmosphère. L'invention concerne également des couches de diffusion de cathode pour systèmes de pile à combustible.

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