LAUSR

Although amorphous materials are popular in oxygen electrocatalysis, their performance requires further improvement to meet the need for rechargeable zinc-air batteries. In this work, an amorphous/crystalline layered manganese oxide (ACMO) is well designed, which unique amorphous/crystalline homogeneous structure activates its oxygen reduction activity with a positive half-wave potential of 0.81 V and oxygen evolution activity with a moderate overpotential of 407 mV at 10 mA cm -2 . Moreover, the amorphous/crystalline structure endows ACMO's excellent stability. While employed as the air-electrode material for rechargeable zinc-air batteries, ACMO overcomes the poor cycling stability of manganese oxide and cycles stably 1000 cycles (~17 days) at 10 mA cm -2 . Besides, it delivers a high power density of 159.7 mW cm -2 and a narrow voltage gap of 0.66 V. This work gives an insight for designing oxide materials with amorphous/crystalline structure and feasible guidance for harmonizing electrochemical activity and stability.