Oxygen reduction reaction (ORR) is an essential half-reaction in next-generation energy storage and conversion systems, such as metal-air batteries and fuel cells. However, its practical application is restricted by the slow intrinsic kinetics, and the high price and low storage of noble metal electrocatalysts. Herein, unique CoFe nanoparticles encapsulated in N-doped carbon (CoFe-NC-Z8-900) with high content graphite-N derived from CoFe-g-C₃N₄@ZIF-8 via stepwise pyrolysis is reported as effective ORR catalysts. The increase of graphitic nitrogen content can enhance both the electrical conductivity and the adsorption of oxygen-containing intermediates, resulting in improved catalytic performance. Fortunately, CoFe-NC-Z8-900 exhibits an exceptionally high half-wave potential (E_1/2) of 0.914 V in a 0.1 M KOH solution. The excellent ORR electrocatalytic activity can be mainly attributed to the synergistic effect of the CoFe bimetal and the relatively high content of graphite-N. This study offers a unique method for creating powerful nitrogen-doped carbon coated metal nanoparticle electrocatalysts.

氧还原反应（ORR）是下一代能量存储和转换系统（例如金属空气电池和燃料电池）中必不可少的半反应。然而，其实际应用受到贵金属电催化剂缓慢的本征动力学、高价格和低储存的限制。在此，通过逐步热解衍生自CoFe-gC ₃ N _{4 @ZIF-8的高含量石墨-N封装在}N掺杂碳（CoFe-NC-Z8-900）中的独特CoFe纳米粒子被报道为有效的ORR催化剂。石墨氮含量的增加可以增强导电性和含氧中间体的吸附，从而提高催化性能。幸运的是，CoFe-NC-Z8-900在 0.1 M KOH 溶液中表现出 0.914 V 的极高半波电位 (E _{1/2 )。}优异的ORR电催化活性主要归功于CoFe双金属和相对较高含量的石墨-N的协同效应。这项研究提供了一种独特的方法来制造强大的氮掺杂碳涂层金属纳米颗粒电催化剂。