Bai Jirong, Cheng Lei, Liu Shuxin, Lian Yuebin, Deng Yaoyao, Zhou Quanfa, Xiang Mei, Tang Yawen, Su Yaqiong
School of Chemical Engineering and Materials, Changzhou Institute of Technology, Changzhou 213022, China; Jiangsu Key Laboratory of New Power Batteries, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China.
School of Chemical Engineering and Materials, Changzhou Institute of Technology, Changzhou 213022, China.
J Colloid Interface Sci. 2024 Jan;653(Pt B):1785-1791. doi: 10.1016/j.jcis.2023.09.171. Epub 2023 Oct 5.
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-CN@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) 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）是下一代储能和转换系统（如金属空气电池和燃料电池）中必不可少的半反应。然而，其实际应用受到内在动力学缓慢以及贵金属电催化剂价格高昂和储量低的限制。在此，通过逐步热解，从CoFe-g-CN@ZIF-8衍生出具有高含量石墨氮的独特的包裹在氮掺杂碳中的CoFe纳米颗粒（CoFe-NC-Z8-900）被报道为有效的ORR催化剂。石墨氮含量的增加可以提高电导率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溶液中表现出异常高的半波电位（E），为0.914 V。优异的ORR电催化活性主要归因于CoFe双金属的协同效应和相对较高含量的石墨氮。本研究提供了一种制备强大的氮掺杂碳包覆金属纳米颗粒电催化剂的独特方法。
