Cu-doped Mn3O4 on carbon black(MCO/C),a functional oxygen reduction reaction(ORR)catalyst,is synthesized via a deposition-calcination method.Through optimizing the molar ratio of Mn to Cu,a mixed-valence MCO/C-51 material is obtained.Among Cu2O/C,Mn3O4/C,MCO/C-31,MCO/C-51,and MCO/C-71,MCO/C-51 exhibits the best ORR catalytic activity with a Tafel slope of 73.6 mV·dec-1 and an electron transfer number of approximately 4.2,along with excellent cycling stability.As MCO/C-51 catalyst is used as a cathode catalyst in zinc-air batteries(ZABs),MCO/C-51 enables ZABs to achieve a cycle life exceeding 128 hours at 5 mA·cm-2,with a significantly enhanced charge-discharge capacity.The specific capacity and power density of the ZABs reach 691 mAh(g Zn)-1 and 80 mW·cm-2,respectively.
Cu dopingMn3O4carbon blackoxygen reduction catalystzinc-air batteries
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