Gas diffusion layer
AssigneeToyota Jidosha Kabushiki Kaisha
InventorTakeaki Saito
Life of this patent
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Abstract
To provide a gas diffusion layer that allows reducing an increase in contact resistance with a separator and also allows reducing deterioration of gas diffusivity. The gas diffusion layer is disposed in contact with a separator including a grooved fluid flow passage. The gas diffusion layer includes a diffusion layer substrate and a water-repellent layer. The diffusion layer substrate has a ratio of a pore diameter to a thickness of 0.35 or more. The water-repellent layer is disposed on a surface of the diffusion layer substrate. The diffusion layer substrate is made of a carbon fiber. A content rate of the carbon fiber is 30% or more.
Claims3
A gas diffusion layer disposed in contact with a separator including a grooved fluid flow passage,
- wherein the gas diffusion layer comprises:
- a diffusion layer substrate that has a ratio of a pore diameter to a thickness of 0.35 or more,
- wherein, in the diffusion layer substrate,
- a ratio of a normal air permeability to an in-plane air permeability is 45×106 or more,
- the diffusion layer substrate includes a conductive carbon fiber, and
- a content rate of the conductive carbon fiber is 30% or more.
Dependencies are inferred from the claim text.