In order to develop an air electrode to be used for rechargeable metal‐air batteries, gas‐diffusion type carbon‐based electrodes have been tested for the electrochemical reduction and evolution of oxygen. The electrode, loaded with a large surface area of
La0.6Ca0.4CoO3
catalyst was found to show high bifunctional performance, i.e., 3000 mA/cm2 (oxygen reduction) and 1000 mA/cm2 (oxygen evolution) at −125 and +700 mV vs.
normalHg/normalHgO
, respectively, in 30 w/o
KOH
at 25°C. The oxide catalyst is considered to decompose effectively
HO2−
, an intermediate appearing in both oxygen reduction and oxygen evolution reactions. The air electrode was stable for 100 cycles of charge‐discharge test at a current density of 100 mA/cm2.
Gas-diffusion electrodes loaded with large surface area perovskite-type oxides, La0.6Ca0.4Co0.8B′0.2O3 (B′ = Mn, Fe, Co, Ni, Cu), were examined for the electro-chemical reduction and evolution of oxygen in 7 M KOH at 25 °C. The oxide with B′ = Fe gave the highest bi-functional performances, i.e., 200 mA/cm2 for the oxygen reduction in air and 300 mA/cm2 for the oxygen evolution at −150 and +620 mV vs. Hg/HgO, respectively, owing to its high catalytic activity for the decomposion of the HO2− intermediate.
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