In view of the slow kinetics of oxygen reduction reaction(ORR)in the cathode of zinc-air battery,it is an effective way to reduce the dosage of precious metals and improve the ORR activity by designing a catalyst composed of non-noble metals and strong conductive carbon-based carriers.By adjusting the molar ratio of Zn2+to Co2+,the complexes between CoO and metal Co encapsulated in N-doped carbon-based rhombic dodecahedrons(CoO-Co/NC)is synthesized.Results show that the synthesized CoO-Co/NC-1 possesses a large number of Co-N-C active sites,making it exhibit excellent electrocatalytic activity for ORR,which is far superior to that of the currently marketed commercial Pt/C(20wt％)catalyst.In addition,as CoO-Co/NC-1 is used as the cathode catalyst of zinc-air battery,the battery exhibits an open circuit voltage of 1.497 V and a cycle stability in 95 h.
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