Abstract: A method for manufacturing a gas diffusion layer for a fuel cell wherein carbon nanotubes are impregnated into Korean paper, thereby enhancing electroconductivity, and a gas diffusion layer manufactured thereby. The method for manufacturing a gas diffusion layer for a fuel cell which is to manufacture a gas diffusion layer as a constituent member of a unit cell in a fuel cell, includes a support preparation step of preparing a support with Korean paper; a dispersion preparation step of dispersing a carbon substance in a solvent to form a dispersion, a coating step of coating the support with the dispersion, and a thermal treatment step of thermally treating the dispersion-coated support to fix the carbon substance to the support.

Abstract: One embodiment provides a gas diffusion layer for a fuel cell constituting a unit cell of the fuel cell. The gas diffusion layer includes a base layer that includes short carbon fibers and has a reinforcing portion formed in a predetermined area thereof in a thickness direction with continuous carbon fibers oriented in the reinforcing portion. The reinforcing portion is formed adjacent to a first surface of the base layer. A micro porous layer is formed on the first surface of the base layer.

Abstract: A multiple perforation plate for a separator of a fuel cell is provided. The multiple perforation plate is disposed between the separator having a flat plate shape and a gas diffusion layer to form flow paths for a reaction gas, and the multiple perforation plate includes a porous hole region having an uneven shape repeatedly formed therein and provided with a plurality of flow path holes configured to allow the reaction gas to flow in a turbulent way, and a channel region forming a flow path configured to allow the reaction gas to flow along a flow direction of the reaction gas in a straight way, wherein the porous hole region and the channel region are alternately disposed and integrally formed.

Abstract: A method for producing a gas diffusion layer for a fuel cell, includes a substrate preparation step of preparing a substrate for the gas diffusion layer; a slurry preparation step of preparing a slurry for a microporous layer containing carboxymethyl cellulose (CMC) and polytetrafluoroethylene (PTFE) diffused in solvent; a microporous layer forming step of forming a microporous layer by applying the slurry onto the substrate; and a heat-treatment step of controlling the hydrophobicity of the gas diffusion layer by heating the substrate having the microporous layer applied thereonto. Also disclosed is a gas diffusion layer produced thereby. The method may control the hydrophobicity of the gas diffusion layer by variably controlling the heat-treatment temperature.

Abstract: A gas diffusion layer for a fuel cell constituting a unit cell of the fuel cell includes a base layer including short carbon fibers and having a reinforcing portion formed in a predetermined area thereof in a thickness direction with continuous carbon fibers oriented in the reinforcing portion. One method of manufacturing the gas diffusion layer includes preparing a mixed dispersion in which short carbon fibers are mixed, orienting continuous carbon fibers on a conveyor belt, forming a paper having a reinforcing portion in which the continuous carbon fibers are oriented by supplying the prepared mixed dispersion to the conveyor belt on which the continuous carbon fibers are oriented, and forming a base layer by impregnating the paper with a hydrophobic agent.

Abstract: Disclosed is a gas diffusion layer for a fuel cell that may be made thinner by integrally forming a base and a fine pore layer, and a method for manufacturing the same. A gas diffusion layer for a fuel cell which constitutes a unit cell of the fuel cell includes: a base layer formed by impregnating a first slurry, in which carbon powder and polytetrafluoroethylene (PTFE) are mixed, in the interior of a carbon fiber base; and a fine pore layer formed by coating a second slurry, in which carbon powder and polytetrafluoroethylene (PTFE) are mixed and which has a viscosity that is higher than the viscosity of the first slurry, on a surface of the base layer.

Abstract: A multiple perforation plate for a separator of a fuel cell is provided. The multiple perforation plate is disposed between the separator having a flat plate shape and a gas diffusion layer to form flow paths for a reaction gas, and the multiple perforation plate includes a porous hole region having an uneven shape repeatedly formed therein and provided with a plurality of flow path holes configured to allow the reaction gas to flow in a turbulent way, and a channel region forming a flow path configured to allow the reaction gas to flow along a flow direction of the reaction gas in a straight way, wherein the porous hole region and the channel region are alternately disposed and integrally formed.

Abstract: Disclosed is a gas diffusion layer for a fuel cell that may be made thinner by integrally forming a base and a fine pore layer, and a method for manufacturing the same. A gas diffusion layer for a fuel cell which constitutes a unit cell of the fuel cell includes: a base layer formed by impregnating a first slurry, in which carbon powder and polytetrafluoroethylene (PTFE) are mixed, in the interior of a carbon fiber base; and a fine pore layer formed by coating a second slurry, in which carbon powder and polytetrafluoroethylene (PTFE) are mixed and which has a viscosity that is higher than the viscosity of the first slurry, on a surface of the base layer.