Electrode base material for fuel cell
TORAYCA® carbon paper is a porous C/C composite (composite material of carbon fiber and carbon) that has been heat-treated at high temperature, whose excellent features make this a favorite base material for fuel cell electrodes and in other electrode applications.
Generation mechanism of fuel cell
TORAYCA®'s carbon paper has been used as electrode base material (gas diffusion layer) for phosphoric acid fuel cells and high polymer fuel cells.
1) Anode side (fuel electrode): 2H2 → 4H+ + 4e-
2) Cathode side (air electrode): 4H+ + O2 + 4e- → 2H2O
1. High conductivity
Carbon fiber bonds to carbon more strongly, resulting in better electrical conduction.
2. High strength
The carbon paper is thin, very strong, and offers excellent compression characteristics.
3. High gas permeability
Its high porosity (approx. 78%) lets gases flow through the carbon paper smoothly.
4. Corrosion resistance
Constituted only by carbon that has been heat-treated at high temperature, the carbon paper contains minimal impurities and exhibits excellent corrosion resistance.
5. Smooth surface
As carbon fibers are oriented in surface direction, this material has very smooth surface subject to little irregularities unlike textile.