The present invention relates to a gas diffusion layer including a porous carbonaceous film layer for a fuel cell, in which the average pore diameter of the porous carbonaceous film layer is 0.1 μm to 100 μm, a membrane-electrode assembly including the gas diffusion layer, and a fuel cell including the membrane-electrode assembly.

The present invention provides a membrane electrode assembly of a fuel cell, comprising a gas diffusion layer, a microporous layer, a catalytic layer, and an electrolyte membrane that are sequentially stacked. In the direction of an air flow path, the thickness of the microporous layer decreases progressively, the thickness of the catalytic layer increases progressively, and the total thickness of the microporous layer and the catalytic layer keeps consistent. The present application also provides a preparation method for the membrane electrode assembly of a fuel cell. The membrane electrode assembly of a fuel cell provided in the present application can balance water content of a gas inlet area and a gas outlet area of the fuel cell, and finally improves the stability of the fuel cell at different temperatures and humidity levels, thereby implementing functions such as improving the durability and decreasing a catalyst load.

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.

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.

The present disclosure relates to a membrane electrode assembly including: a polymer electrolyte membrane; an anode catalyst layer formed on one side of the polymer electrolyte membrane; a cathode catalyst layer formed on the other side of the polymer electrolyte membrane; and a porous carbon layer formed on the cathode catalyst layer on the side opposite to the side contacting with the polymer electrolyte membrane and comprising a polymer binder and a carbon particle, and a fuel cell including the same. The present disclosure can prevent water evaporation from an electrolyte under low-humidity environment while minimizing decrease in performance under high-humidity operating environment and can improve fuel cell performance by facilitating the back diffusion of water generated at the cathode.

A porous carbon sheet including at least carbon fibers, having a thickness of 30 to 95 μm, a gas permeation resistance of 0.5 to 8.8 Pa, and a tensile strength of 5 to 50 N/cm, and a gas diffusion electrode substrate including a porous carbon sheet containing at least carbon fibers, at least one surface thereof having a microporous layer containing at least an electric conductive filler, the gas diffusion electrode substrate being dividable in the thickness direction into a smaller pore part and a larger pore part, the larger pore part having a thickness of 3 to 60 μm.

A porous carbon sheet including at least carbon fibers, having a thickness of 30 to 95 μm, a gas permeation resistance of 0.5 to 8.8 Pa, and a tensile strength of 5 to 50 N/cm, and a gas diffusion electrode substrate including a porous carbon sheet containing at least carbon fibers, at least one surface thereof having a microporous layer containing at least an electric conductive filler, the gas diffusion electrode substrate being dividable in the thickness direction into a smaller pore part and a larger pore part, the larger pore part having a thickness of 3 to 60 μm.

A multilayer structure, of use as composite diffusion layer in a proton-exchange membrane fuel cell, including at least one mat of carbon nanotubes having a unit diameter of less than or equal to 20 nm, defining at least one face of the structure, the mat of carbon nanotubes being superposed on a support based on carbon fibres. It also relates to a process for preparing such a multilayer structure and to the use thereof for an electrode of a PEMFC.

A multilayer structure, of use as composite diffusion layer in a proton-exchange membrane fuel cell, including at least one mat of carbon nanotubes having a unit diameter of less than or equal to 20 nm, defining at least one face of the structure, the mat of carbon nanotubes being superposed on a support based on carbon fibres. It also relates to a process for preparing such a multilayer structure and to the use thereof for an electrode of a PEMFC.

A carbon substrate for a gas diffusion layer of a fuel cell, the carbon substrate being a porous carbon substrate having a first surface and a second surface opposite the first surface, the carbon substrate includes a plurality of carbon fibers arranged irregularly to form a non-woven type and a carbide of an organic polymer located between the carbon fibers to bind the carbon fibers to each other, the carbide has a graphite structure, and the carbon substrate has a Bragg diffraction angle 2θ of less than 26.435° and a interplanar distance d(002) of less than 3.372 Å, a gas diffusion layer employing the same, an electrode for a fuel cell, a membrane electrode assembly for a fuel cell, and a fuel cell. When the gas diffusion layer is manufactured using the carbon substrate according to the present disclosure, cell voltage characteristics of the fuel cell may be greatly improved.