| Abstract:Fiber composite carbon paper precursors (CPP) were prepared by using flax fibers, viscose fibers, and ES fibers as reinforcement fibers to mix with carbon fibers respectively as rew material. Then CPP was impregnated with resin, hot pressed (temperature 140℃, pressure 10 MPa) and heat treated (under nitrogen protection, temperature at 980℃) to make high-performance carbon paper for gas diffusion layer of fuel cell. The effects of adding three kinds of reinforcing fibers on CPP strength, carbon paper resistivity, porosity and tensile strength were studied. The results showed that the reinforcing fibers could fix the carbonized resin, significantly increase the tensile strength of carbon paper, and reduced the resistivity and porosity of carbon paper. When the dosage of flax fiber was 20%, compared with no reinforcement fibers carbon paper, the tensile strength of carbon paper was increased from 18.5 MPa to 20.4 MPa, an increase of 10%. The resistivity was reduced from 36.7 mΩ·cm to 34.2 mΩ·cm, a decrease of 7%. The porosity decreased from 63% to 56.4%, a decrease of 10%. |
