针对锌-空气电池阴极的氧还原反应(ORR)动力学缓慢问题,设计非贵金属与强导电性碳基载体进行复合的催化剂是降低贵金属用量和提高ORR活性的有效途径。通过调节Zn²⁺和Co²⁺的摩尔比合成了封装在氮掺杂碳基菱形十二面体中的CoO和金属Co的复合物CoO-Co/NC。结果表明,合成的CoO-Co/NC-1拥有大量的Co—N—C活性位点,使其表现出优异的ORR电催化性能,其性能远优于目前市场上的商业Pt/C(20%)催化剂。此外,当使用CoO-Co/NC-1作为锌-空气电池阴极的催化剂时,该电池展现出1.497 V的开路电压和长达95 h的循环稳定性。

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.

张正(1995-),男,硕士生,研究方向为过渡金属与碳复合材料的制备及氧还原电催化性能,2550345570@qq.com;李翠芹(1977-),女,博士,副教授,研究方向为资源高效利用及能源材料,通讯联系人,cqli@gzu.edu.cn。