Objective To enhance the bifunctional electrocatalytic oxygen evolution and oxygen reduction capabili-ties of metal-organic frameworks(MOFs)derived materials as a way to solve the cyclic charging and discharging problems in metal-air batteries and to reduce the consumption of precious metals such as ruthenium.Methods Co and Fe bimetals were utilized to dope with zeolite imidazolium skeleton(ZIF-8)as a template with 1H-1,2,3-triazole organic ligand added and the precursor material was obtained after stirring,centrifugation and drying at the room temperature.Finally the calcination of the precursor material yielded the Co4Fe1@NC carbon material.Results Only 1.52 V was required to reach a current density of 10mA·cm-2 for Co4Fe1@NC in the oxygen evolu-tion reaction.Half-wave potential ofwas 0.93V for Co4Fe1@NC in the oxygen reduction reaction.The gap be-tween the two voltages was 0.59V,lower than that of the single-metal Co or Fe-derived carbon material.Conclu-sions The use of Co and Fe bimetallic doping strategy can significantly enhance the bifunctional electrocatalytic oxygen evolution and oxygen reduction ability of MOFs-derived catalytic materials,and the introduction of Fe ele-ment effectively modulates the electronic structure of Co element,providing better oxygen species adsorption and desorption ability during oxygen evolution and oxygen reduction process,so that Co4Fe1@NC can be used as a potential negative electrode material for metal-air batteries.
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