Hydrothermal transformation of dried grass into graphitic carbon-based high performance electrocatalyst for oxygen reduction reaction.
Hydrothermal transformation of dried grass into graphitic carbon-based high performance electrocatalyst for oxygen reduction reaction.
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DOI：
10.1002/smll.201400781
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发表时间：
2014-08
期刊：
影响因子：
13.3
通讯作者：
Haimin Zhang;Yun Wang;Dan Wang;Yibing Li;Xiaolu Liu;Porun Liu;H. Yang;T. An;Z. Tang
中科院分区：
文献类型：
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作者：
Haimin Zhang;Yun Wang;Dan Wang;Yibing Li;Xiaolu Liu;Porun Liu;H. Yang;T. An;Z. Tang
在这项工作中，我们提出了一种低成本和环境友好的水热方法，使用干草作为唯一的起始材料，没有任何合成化学品，直接生产高质量的氮掺杂碳纳米点/纳米片聚集体（N-CNAs），实现了25.2%的高产率。所制备的N-CNA具有3.41%的N/C原子比，由三种类型的掺杂N组成，其比例为2.6（吡啶）：1.7（吡咯）：1（石墨）。实验结果表明，对于氧还原反应，N-CNAs的电催化活性、稳定性和抗交叉效应等性能均优于或接近商业Pt/C电催化剂。理论研究进一步表明，掺杂的吡啶-N是N-CNAs具有优异的四电子ORR电催化活性的关键。
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.