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 = Pt²⁺ and Pd²⁺) 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 Mn²⁺) as the cathodes exhibited power densities lower than 0.01 mW cm^-2, indicating that Fe²⁺ ions are indispensable to achieve the high power density.