Fig. 2.

Electrochemical performance of Fe/N/CF network catalyst. (A) RRDE test on Fe/N/CF in O₂ saturated 0.5 M H₂SO₄ compared with 20 wt % Pt/C. (B) Cell voltages and (C) power densities as the functions of the current density measured in the fuel cell tests with Fe/N/CF, Fe/N/KB or commercial 20 wt % Pt/C as the cathode catalyst. For Fe/N/CF and Fe/N/KB, the catalyst loadings were 3 mg⋅cm⁻² with I/C = 1.5/1. For Pt/C, the cathode catalyst loading was 0.3 mg Pt⋅cm⁻². In all three cases, the anode loading was 0.3 mg Pt⋅cm⁻² prepared with 20 wt % Pt/C. Nafion 211 was used as the membrane. The absolute pressures of O₂ and H₂ were kept at 2 bars under 100% RH and the gas temperature was maintained at 80 °C.