Cathodic oxygen reduction reaction(ORR)of the zinc-air batteries is slow,urgently needed to develop cathode catalysts with high activity and low cost.Porous carbon with Co-Ni loaded cage-like bimetal sulfide nanoparticles derived from the Zeolitic imidazolate framework(ZIF)were synthesized by two-step pyrolysis methods.By SEM,XRD,Raman,N2 adsorption apparatus and electrochemical analysis,the morphology,structure and properties of porous carbon supported by Co and Ni cage bimetallic sulfide were characterized.The results show that the as-prepared bimetallic sulfide exposes more active sites and exhibits remarkable electrocatalytic activity.In the ORR performance test,the half-wave potential reached 0.89 V,better than the 0.85 V of commercial Pt/C catalysts.The OER performance shows a potential of 1.79 V at a current density of 10 mA/cmn2,comparable to the commercial IrO2(potential of up to 1.68 V).The caged bimetallic sulfide presents excellent properties which can be used as excellent dual function electrocatalysts for zinc-air cells.
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