One-pot synthesis of FeNxC as efficient catalyst for high-performance zinc-air battery

摘要

Rechargeable zinc-air batteries(ZAB)with a high theoretical energy density of 1086 Wh kg^(-1),have received tremendous research attention.However,the practical application of ZABs is still limited by high polarization and poor energy efficiency(low power density)due to the sluggish 4 electrons(e^(-))/oxygen(O_(2))kinetics over the air electrode.Here,a noble-metal-free Fe Nx C electrocatalyst is developed via a onepot approach,which provides a high density of the oxygen reduction reaction(ORR)active site and facilitates the ORR kinetics.Accordingly,the as-assembled Zn-air battery displayed a low charge–discharge voltage gap of 0.71 V at 10 m A cm^(-2),a remarkable peak power density as high as 181.2 m W cm^(-2),as well as the long-term durability for hundreds of hours,among the top level of those reported previously.Our work provides a major boost for the practical application of Zn-air battery in the future.