Gas diffusion backing for fuel cells

Details Gas diffusion backing for fuel cells Gas diffusion backing for fuel cells

H - Electricity

01

M

H01M 8/10 (2006.01) H01M 4/86 (2006.01) H01M 4/88 (2006.01) H01M 4/96 (2006.01)

Patent

CA 2470540

A gas diffusion backing for fuel cells wherein a porous carbonaceous paper or fabric, impregnated with a first fluorinated polymer, bears a microporous coating of a second fluorinated polymer admixed with carbon particles. Also, a process for making the composite wherein the fluorinated polymers are coalesced by heating above their glass transition temperature or melting point is described. A membrane electrode assembly prepared using these gas diffusion backing and a fuel are also provided.

L'invention concerne une couche de diffusion de gaz pour piles à combustible, dans laquelle un papier ou un tissu carboné poreux imprégné d'un premier polymère fluoré, supporte un revêtement microporeux d'un second polymère fluoré mélangé avec des particules de carbone. L'invention concerne également un procédé de fabrication dudit composite dans lequel les polymères fluorés sont coalescés par le chauffage de ceux-ci au-delà de leur température de transition vitreuse ou de leur point de fusion. Un ensemble membrane-électrode préparé à l'aide de cette couche de diffusion de gaz et un combustible sont décrits.

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