Centre for Composite Materials and Structures, Harbin Institute of Technology , Harbin 150080, China.
Liaoning Key Materials Laboratory for Railway, School of Materials Science and Engineering, Dalian Jiaotong University , Dalian 116028, China.
ACS Appl Mater Interfaces. 2017 Jan 11;9(1):398-405. doi: 10.1021/acsami.6b12547. Epub 2016 Dec 27.
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.
用成本低、储量丰富的金属替代稀有和贵金属催化剂是可持续化学的主要目标之一。在此，我们报告了通过简单的热解三聚氰胺和二苄基硫醚混合物合成 S、N 双掺杂类石墨烯碳纳米片，作为高效的无金属氧还原反应（ORR）电催化剂。与单掺杂的相比，S、N 双掺杂的类石墨烯碳纳米片对 ORR 表现出增强的活性，与传统的 Pt/C 电催化剂相比，在碱性和酸性介质中都具有优异的耐久性。在类石墨烯碳纳米片中，高含量的石墨-N 和吡啶-N 对 ORR 电催化是必要的，但适量的 S 原子进一步有助于提高 ORR 活性。所制备的 S、N 双掺杂类石墨烯碳纳米片具有优异的 ORR 性能，这意味着在能源设备的实际应用中具有很大的应用前景。
