Fluid diffusion layers for fuel cells

Details Fluid diffusion layers for fuel cells Fluid diffusion layers for fuel cells

H - Electricity

01

M

H01M 4/96 (2006.01) H01M 4/86 (2006.01) H01M 4/88 (2006.01) H01M 4/94 (2006.01) H01M 8/02 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2420485

Fluid diffusion layers with favorable mechanical and electrical properties are prepared for fuel cell electrodes by impregnating a porous carbonaceous web with a carbonizable polymer having pyrrolidone functionality and then carbonizing the pyrrolidone polymer. The polymer having pyrrolidone functionality is stabilized against vaporization by use of an oxidization step prior to carbonization. The fluid diffusion layers are particularly suitable for use as gas diffusion layers in solid polymer electrolyte fuel cells.

On produit ces couches de diffusion fluidique pour piles à combustible, dotées de propriétés mécaniques et électroniques avantageuses, en imprégnant une bande carbonée poreuse d'un polymère susceptible de carbonisation doté d'une fonctionnalité pyrrolidone, puis en carbonisant ce polymère. On se prémunit contre la vaporisation de ce polymère à fonctionnalité pyrrolidone en utilisant un agent oxydant avant la carbonisation. Ces couches de diffusion fluidique conviennent particulièrement comme couches de diffusion de gaz dans des piles à combustible à électrolyte polymère solide.

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