The low cost and highly efficient construction of electrocatalysts has attracted significant attention owing to the use of clean and sustainable energy technologies. In this work, cobalt nanoparticle decorated N-doped carbons (Co@NC) are synthesized by the pyrolysis of a cobalt covalent organic framework under an inert atmosphere. The Co@NC demonstrates improved electrocatalytic capabilities compared to N-doped carbon without the addition of Co nanoparticles, indicating the important role of cobalt. The well-dispersed active sites (Co-N_x) and the synergistic effect between the carbon matrix and Co nanoparticles greatly enhance the electrocatalytic activity for the oxygen reduction reaction. In addition, the Co content has a significant effect on the catalytic activity. The resulting Co@NC-0.86 exhibits a superb electrocatalytic activity for the oxygen reduction reaction in an alkaline electrolyte in terms of the onset potential (0.90 V), half-wave potential (0.80 V) and the limiting current density (4.84 mA·cm⁻²), and a high selectivity, as well as a strong methanol tolerance and superior durability, these results are comparable to those of the Pt/C catalyst. Furthermore, the superior bifunctional activity of Co@NC-0.86 was also confirmed in a home-built Zn-air battery, signifying the possibility for application in electrode materials and in current energy conversion and storage devices.

由于使用清洁和可持续能源技术，电催化剂的低成本和高效构建引起了广泛关注。在这项工作中，钴纳米颗粒装饰的 N 掺杂碳 (Co@NC) 是通过在惰性气氛下热解钴共价有机框架合成的。与未添加 Co 纳米颗粒的 N 掺杂碳相比，Co@NC 表现出更高的电催化能力，表明钴的重要作用。分散良好的活性位点（Co-N _x) 以及碳基体和 Co 纳米颗粒之间的协同作用大大增强了氧还原反应的电催化活性。此外，Co含量对催化活性有显着影响。所得Co@NC-0.86在碱性电解质中的氧还原反应的起始电位（0.90 V）、半波电位（0.80 V）和极限电流密度（4.84 mA·cm）方面表现出极好的电催化活性⁻²)、高选择性、强甲醇耐受性和优异的耐久性，这些结果与 Pt/C 催化剂的结果相当。此外，Co@NC-0.86 的优异双功能活性也在自制的锌空气电池中得到证实，表明其在电极材料和当前能量转换和存储设备中的应用具有可能性。