Replacement of rare and precious metal catalysts with low-cost and earth-abundant ones is currently among the major goals of sustainable chemistry. Herein, we report the synthesis of S, N dual-doped graphene-like carbon nanosheets via a simple pyrolysis of a mixture of melamine and dibenzyl sulfide as efficient metal-free electrocatalysts for oxygen reduction reaction (ORR). The S, N dual-doped graphene-like carbon nanosheets show enhanced activity toward ORR as compared with mono-doped counterparts, and excellent durability in contrast to the conventional Pt/C electrocatalyst in both alkaline and acidic media. A high content of graphitic-N and pyridinic-N is necessary for ORR electrocatalysis in the graphene-like carbon nanosheets, but an appropriate amount of S atoms further contributes to the improvement of ORR activity. Superior ORR performance from the as-prepared S, N dual-doped graphene-like carbon nanosheets implies great promises in practical applications in energy devices.

中文翻译：

---

S，N双掺杂类石墨烯碳纳米片作为高效氧还原反应电催化剂

用低成本和富含地球的催化剂替代稀有和贵金属催化剂是当前可持续化学的主要目标之一。在这里，我们报告了通过简单的热解三聚氰胺和二苄基硫醚的混合物作为氧还原反应（ORR）的有效的无金属电催化剂，来合成S，N双掺杂的类石墨烯碳纳米片。与传统的Pt / C电催化剂在碱性和酸性介质中相比，S，N双掺杂石墨烯样碳纳米片与单掺杂对应物相比，对ORR具有增强的活性，并且具有出色的耐久性。对于石墨烯状碳纳米片中的ORR电催化，石墨-N和吡啶-N的含量高是必需的，但是适当量的S原子进一步有助于ORR活性的提高。