Developing cost-effective electrocatalysts for oxygen reduction reaction (ORR), oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is vital in energy conversion and storage applications. Herein, we report a simple method for the synthesis of graphene-reinforced CoS/C nanocomposites and the evaluation of their electrocatalytic performance for typical electrocatalytic reactions. Nanocomposites of CoS embedded in N, S co-doped porous carbon and graphene (CoS@C/Graphene) were generated via simultaneous sulfurization and carbonization of one-pot synthesized graphite oxide-ZIF-67 precursors. The obtained CoS@C/Graphene nanocomposites were characterized by X-ray diffraction, Raman spectroscopy, thermogravimetric analysis-mass spectroscopy, scanning electronic microscopy, transmission electronic microscopy, X-ray photoelectron spectroscopy and gas sorption. It is found that CoS nanoparticles homogenously dispersed in the in situ formed N, S co-doped porous carbon/graphene matrix. The CoS@C/10Graphene composite not only shows excellent electrocatalytic activity toward ORR with high onset potential of 0.89 V, four-electron pathway and superior durability of maintaining 98% of current after continuously running for around 5 h, but also exhibits good performance for OER and HER, due to the improved electrical conductivity, increased catalytic active sites and connectivity between the electrocatalytic active CoS and the carbon matrix. This work offers a new approach for the development of novel multifunctional nanocomposites for the next generation of energy conversion and storage applications.

开发用于氧还原反应 (ORR)、析氧反应 (OER) 和析氢反应 (HER) 的具有成本效益的电催化剂在能量转换和存储应用中至关重要。在此，我们报告了一种合成石墨烯增强 CoS/C 纳米复合材料的简单方法，并评估了它们在典型电催化反应中的电催化性能。嵌入在 N、S 共掺杂多孔碳和石墨烯中的 CoS 纳米复合材料（CoS@C/石墨烯）是通过一锅法合成氧化石墨-ZIF-67 前驱体的同时硫化和碳化产生的。获得的 CoS@C/石墨烯纳米复合材料通过 X 射线衍射、拉曼光谱、热重分析-质谱、扫描电子显微镜、透射电子显微镜、X 射线光电子能谱和气体吸附。发现 CoS 纳米颗粒均匀地分散在原位形成 N, S 共掺杂多孔碳/石墨烯基质。CoS@C/10Graphene 复合材料不仅对 ORR 表现出优异的电催化活性，具有 0.89 V 的高起始电位、四电子通路和在连续运行约 5 小时后保持 98% 电流的卓越耐久性，而且还表现出良好的OER 和 HER，由于电导率的提高，增加了催化活性位点以及电催化活性 CoS 与碳基质之间的连接性。这项工作为开发用于下一代能量转换和存储应用的新型多功能纳米复合材料提供了一种新方法。