Carbon Cloth Diffusion Layer for Fuel Cell Electrode

摘要

This paper has developed one way to produce flexible carbon cloth from artificial cotton cloth carbonized at 1000°C with using (NH_4)_2HPO_4 as impregnation agent and phenolic resin as modification agent. The effects of (NH_4)_2HPO_4 and phenolic resin on bulk resistivity, tensile strength, density, thickness and microstructure of the resultant carbon cloth were investigated. The results show that (NH_4)_2HPO_4 impregnation is helpful to increase the carbon yield of artificial cotton cloth and decrease the bulk resistivity. The fibers in the carbon cloth are bond by carbonized phenolic resin, leading to higher tensile strength and lower bulk resistivity. When mass content of (NH_4)_2HPO_4 was 5% and phenolic resin 54%, flexible and porous carbon cloth was prepared with thickness of 0.27mm, density of 0.34g/cm~3, bulk resistivity of 0.06Ωcm and tensile strength of 2.33MPa, which is promising materials for diffusion layer in fuel cell.