High power density of one-compartment H2O2 fuel cells using pyrazine-bridged Fe[M(C)(CN)4] (M(C) = Pt2+ and Pd2+) complexes as the cathode.

Pyrazine-bridged Fe[M(C)(CN)4] complexes (M(C) = Pt(2+) and Pd(2+)) with 3D porous structures were utilized as the cathode of one-compartment H2O2 fuel cells, which operated in 0.3 M H2O2, using a nickel mesh as an anode. The power density of a H2O2 fuel cell using pyrazine-bridged Fe[Pt(CN)4] reached 4.2 mW cm(-2), which is the highest value reported for the one-compartment H2O2 fuel cells. On the other hand, H2O2 fuel cells using pyrazine-bridged M(N)[Pt(CN)4] (M(N) = Co(2+) and Mn(2+)) as the cathodes exhibited power densities lower than 0.01 mW cm(-2), indicating that Fe(2+) ions are indispensable to achieve the high power density.