A non-noble-metal bifunctional catalyst with efficient and durable activity towards both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) is crucial to the development of rechargeable Zn-air batteries. Herein, a facile one-step hydrothermal method is reported for the synthesis of a high-performance bifunctional oxygen electrocatalyst, cobalt-doped Mn 3 O 4 nanocrystals supported on graphene nanosheets (Co-Mn 3 O 4 /G). Compare to pristine Mn 3 O 4 , this Co-Mn 3 O 4 /G exhibits greatly enhanced electrocatalytic activity, delivering a halfwave potential of 0.866 V for the ORR and a low overpotential of 275 mV at 10 mA cm À2 for the OER. The zinc-air battery built with Co-Mn 3 O 4 /G shows a reduced charge-discharge voltage of 0.91 V at 10 mA cm À2 , an power density of 115.24 mW cm À2 and excellent stability without any degradation after 945 cycles (315 h), outperforming the state-of-the-art Pt/C-Ir/C catalyst-based device.
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