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In this work,both the primary and rechargeable Zn-air batteries with NiCo2O4 nanosphere and carbon nanotubes hybrid(NiCo2O4-CNTs)for the cathode have been successfully developed.The catalysts are synthesized through a facile one-pot precipitation reaction and hydrothermal process,which exhibited highly active bifunctional catalytic activity for both oxygen reduction reaction(ORR)and oxygen evolution reaction(OER).Using NiCo2O4-CNTs as air cathode,the resulting practical primary and electrochemically rechargeable Zn-air batteries give a promising discharge peak power density as high as 320 mW cm-2,and a high current density 210 mA cm-2 at 1.0V.Also,the rechargeable Zn-air batteries in a two-electrode configuration exhibited an unprecedented small charge–discharge voltage polarization of~0.75V at 10 mA cm-2,high reversibility and stability over long charge and discharge cycles.The high performance is believed to be induced by the hybrid effect(coupling effect)among NiCo2O4 and CNTs,which can produce a synergy enhancement for both catalytic ORR and OER.