Centre for Clean Environment and Energy, Griffith University, Gold Coast Campus, QLD, 4222, Australia.
Small. 2014 Aug 27;10(16):3371-8. doi: 10.1002/smll.201400781. Epub 2014 Apr 14.
In this work, we present a low cost and environmentally benign hydrothermal method using dried grass as the sole starting material without any synthetic chemicals to directly produce high quality nitrogen-doped carbon nanodot/nanosheet aggregates (N-CNAs), achieving a high yield of 25.2%. The fabricated N-CNAs possess an N/C atomic ratio of 3.41%, consist of three typed of doped N at a ratio of 2.6 (pyridinic):1.7 (pyrrolic):1 (graphitic). The experimental results reveal that for oxygen reduction reaction (ORR), the performance of N-CNAs, in terms of electrocatalytic activity, stability and resistance to crossover effects, is better or comparable to the commercial Pt/C electrocatalyst. The theoretical studies further indicate that the doped pyridinic-N plays a key role for N-CNAs' excellent four-electron ORR electrocatalytic activity.
在这项工作中，我们提出了一种低成本且环境友好的水热法，使用干草作为唯一的起始材料，无需任何合成化学品，直接制备出高质量的氮掺杂碳纳米点/纳米片聚集体（N-CNAs），产率高达 25.2%。所制备的 N-CNAs 具有 N/C 原子比为 3.41%，由三种掺杂 N 的类型组成，比例为 2.6（吡啶型）：1.7（吡咯型）：1（石墨型）。实验结果表明，对于氧还原反应（ORR），N-CNAs 的电催化活性、稳定性和抗交叉效应性能优于或可与商业 Pt/C 电催化剂相媲美。理论研究进一步表明，掺杂的吡啶型-N 对 N-CNAs 优异的四电子 ORR 电催化活性起着关键作用。
