It is highly desirable to synthesise heteroatom-doped carbon-based materials in an environmentally friendly and simple way which nevertheless produces good electrocatalytic activity towards the oxygen reduction reaction (ORR). Therefore, in this study, we focused on comparing sulphur and nitrogen co-doped graphene-based materials prepared using simple synthesis procedures as ORR electrocatalysts. In particular, we considered two different sulphur and nitrogen precursors (thiosemicarbazide and trithiocyanuric acid) and either dry ball-milling or a wet method based on sonication followed by pyrolysis at 800 °C for S,N-co-doping of graphene. Electrochemical investigation of the S,N-co-doped catalysts using the rotating disc electrode (RDE) method showed superior ORR activity compared to the undoped graphene material, which is due to the synergetic effect of sulphur and nitrogen co-doping as well as to the defects present in the catalysts.

非常希望以环境友好和简单的方式合成杂原子掺杂的碳基材料，该方法仍然对氧还原反应（ORR）产生良好的电催化活性。因此，在这项研究中，我们集中于比较使用简单的合成程序作为ORR电催化剂制备的硫和氮共掺杂的石墨烯基材料。特别是，我们考虑了两种不同的硫和氮前体（硫代氨基脲和三硫氰尿酸），以及基于球化的干法球磨或湿法，然后在800°C的温度下热解石墨烯进行S，N-共掺杂。使用旋转圆盘电极（RDE）方法对S，N共掺杂的催化剂进行的电化学研究表明，与未掺杂的石墨烯材料相比，ORR活性更高，