通过沉积-焙烧方法合成了一种在炭黑上Cu掺杂Mn₃O₄的氧还原反应(ORR)功能催化剂MCO/C。通过优化Mn与Cu的摩尔比合成得到Mn和Cu元素混合价态的MCO/C-51。在ORR过程中,MCO/C-51在Cu₂O/C、Mn₃O₄/C、MCO/C-31和MCO/C-71中表现出最佳的ORR催化活性,其Tafel斜率为73.6 mV/dec,电子转移数约为4.2,具有优异的循环稳定性。在锌-空气电池(ZABs)的阴极使用MCO/C-51催化剂,ZABs的循环寿命在5 mA/cm²时超过128 h,其充放电容量也大幅提升,ZABs的比容量和功率密度分别达到691 mAh/(g Zn)和80 mW/cm²。

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.

张钧凯(2000-),男,硕士生,研究方向为锌空气电池,570453413@qq.com;罗鲲(1966-),男,博士,教授,研究方向为纳米材料及金属空气电池,通讯联系人,luokun@cczu.edu.cn。