H - Electricity – 01 – M
Patent
H - Electricity
01
M
H01M 8/10 (2006.01) H01M 8/02 (2006.01) H01M 8/04 (2006.01)
Patent
CA 2330322
An improved porous support layer (40, 42) includes hydrophobic pores and hydrophilic pores integrated throughout the layer (40, 42), wherein the hydrophobic pores are coated with a hydrophobic substance and include about 75 % to about 95 % of the total pore volume of the layer (40, 42), and the hydrophilic pores comprise about 25 % to about 5 % of the total pore volume of the layer (40, 42). A method of manufacture of the layer (40, 42) includes the steps of filling about 25 % to about 5 % of the pore volume of a carbon fiber substrate layer with a blocking material; applying a hydrophobic substance to the unfilled pore volume of the substrate layer; and heat treating the dried substrate at a temperature adequately high to volatilize or decompose the blocking material and fuse the hydrophobic substance to the pores to produce the porous support layer (40, 42).
L'invention concerne une couche de support poreux (40, 42) comprenant des pores hydrophobes et hydrophiles intégrés à la couche (40, 42). Les pores hydrophobes sont revêtus d'une substance hydrophobe et constituent environ entre 75 % et environ 95 % du volume de pore total de la couche (40, 42), et les pores hydrophiles constituent environ entre 25 % et environ 5 % du volume de pore total de la couche (40, 42). L'invention concerne en outre un procédé de fabrication de la couche (40, 42), qui consiste à remplir environ entre 25 % et environ 5 % du volume de pore d'une couche de substrat en fibre de carbone avec un matériau bloquant, à appliquer une substance hydrophobe au volume de pore non rempli de la couche de substrat, et à traiter thermiquement le substrat séché à une température suffisamment élevée pour volatiliser ou décomposer le matériau bloquant et fusionner la substance hydrophobe aux pores, de manière à produire la couche de support poreux (40, 42).
International Fuel Cells Corporation
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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