O2 reduction kinetics on the ground graphite mixed with transition metal oxides were studied. O2 reduction by the mixed catalyst occurs through formation of intermediate H2O2 on graphite. The H2O2 is decomposed by the metal oxides catalytically. Most of the O2 produced from decomposing H2O2 is then recycled for further reduction on the ground graphite. The mixture of ground graphite and transition metal oxides has a good performance for O2 reduction

Key words: REACTION KINETICS, REDUCTION, MANGANESE OXIDE, NICKEL COMPOUNDS, COBALT OXIDE, TRANSITION METAL COMPOUND, GRAPHITE, ROTATION ELECTRODES, COBALTATE