FeCo/NCNTs-3∶1 catalyst,in which FeCo alloy particles are coated by nitrogen-doped carbon nanotubes,is successfully prepared via high-temperature pyrolysis method,and characterized and analyzed by using transmission electron microscopy(TEM),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS)and electrochemical testing.It is indicated by the results that the catalyst has a hollow bamboo-like carbon nanotube structure,which facilitates O2 transport,electrolyte diffusion and electron transfer.The formation of FeCo alloys in the catalyst are favorable for increasing the catalytic speed.The catalyst is rich in Fe/Co-N-C active sites,which facilitates the catalytic reaction.The half-wave potential of FeCo/NCNTs-3∶1 is 0.84 V for the oxygen reduction reaction(ORR)performance.As for oxygen evolution reaction(OER),the corresponding potential is 1.652 V at 10 mA·cm-2 of current density.The zinc-air battery with it as the air cathode has an open-circuit voltage of 1.49 V and a power density of 142.41 mW·cm-2.
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