LAUSR

Abstract A low-cost, efficient and durable bi-functional electrocatalysts for bi-functional oxygen reduction/evolution reactions (ORR/OER) is vital for modern energy conversion devices. Here, we report the exploration of advanced OER/ORR bi-functional catalysts based on foaming-assisted electrospinning. The addition of foaming agent is beneficial to prevent the agglomeration of FeCo alloy nanoparticles decorated on the N-doped mesoporous carbon nanofibers (FeCo@NCNF). These rationally designed electrocatalysts exhibit an excellent bi-functional electrocatalytic activity with a low reversible overvoltage of 0.749 V. The as-constructed Zn-air battery delivers a power density of 134.83 mW cm-2 and long-term cycling stability with a slight increase of 0.02 V in potential gap over 216 h at 5 mA cm-2, surpassing to most bi-functional electrocatalysts ever reported.