Carbon fibre cloth for gaseous diffusion layer of fuel cell

Abstract

A carbon fiber cloth for the gas diffusion layer of a fuel battery is characterized in that polyacrylonitrile (PAN) fiber is pre-oxidized at a temperature of 300 DEG C in a pre-oxidizing furnace to obtain the pre-oxidized fiber; the pre-oxidized fiber is prepared into the pre-oxidized fiber cloth with the thickness of 0.60 mm by adopting the conventional process, wherein the longitudinal yarn is formed by double-yarn with a thickness of 0.445 mm to 0.450 mm, and the transverse yarn is formed by double-yarn with a thickness of 0.445 mm to 0.450 mm; and the density of the longitudinal yarn is 15.7 to 17.7 strands / cm, and the density of the transverse yarn is 15.4 strands / cm; and the pre-oxidized fiber cloth is prepared into the carbon fiber cloth by the secondary carbonization, wherein the areal weight is 80 to 170 g/m<2>; the thickness is 0.20 to 0.3 mm; the density is 0.362 to 400 g/cc; the carbon content is 99.5%; the interlayer shearing force is 5.0 mpa; the tensile strength is 192.5; the tensile modulus is 26.6 Mn/cm<2> (msi); the flexure strength is 50 Mpa and the bending modulus is 7.5 Gpa. The prepared carbon fiber cloth is optimized and has a smooth surface.

Description

technical field [0001] The invention relates to the field of carbon fiber composite material manufacturing, and relates to a carbon fiber cloth used for a gas diffusion layer of a fuel cell. Background technique [0002] The gas diffusion layer material plays a role in supporting the catalyst layer and stabilizing the electrode structure in the electrode. It also provides fuel gas channels, electron channels and drainage channels for the electrode reaction. The influence of different diffusion layer materials on the structure, manufacturing process and performance of the electrode Also vary. Carbon fiber paper (carbon paper), carbon cloth, non-woven fabric and carbon black paper are commonly used electrode materials. [0003] At present, some gas diffusion layers use carbon paper, and some use carbon cloth materials. They not only have a uniform porous thin-layer structure, but also have good electrical conductivity, good chemical stability and heat resistance, and the fla...

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Problems solved by technology

However, this duplication method has the difficulty of increasing the number of processing steps

Also, the use of a water-repellent layer-forming coating formulated to a suitable high viscosity to suppress the above-mentioned penetration is being studied, but no significant inhibitory effect has been obtained.

[0014] For the previous carbon fiber cloth used as the base material of the gas diffusion layer, due to the rigidity of the surface of the carbon fiber bundles, it is impossible to make the uniformity of the intersecting gap of each bundle through weaving, and because of the surface slidi

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