Electrode base material for fuel cell

Overview

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.

The structure and Generation mechanism of high polymer fuel cells.
The structure and Generation mechanism of high polymer fuel cells.

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.

Electrode reaction

1) Anode side (fuel electrode): 2H2 → 4H+ + 4e-
2) Cathode side (air electrode): 4H+ + O2 + 4e- → 2H2O

Features

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.

Examples of products