期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 264, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118537
关键词
Oxygen reduction reaction; N-doped carbon nanotubes; Pyridinic-N; Zn-air batteries; Density functional theory
资金
- National Key RAMP
- D Program of China [2017YFB0102900, 2018YFB0104000]
- National Nature Science Foundation of China [21571189, 21671200]
- Hunan Provincial Science and Technology Plan Project of China [2016TP1007, 2017TP1001, 2018RS3009]
- Research and Development Plan of Key Areas in Hunan Province [2019GK2033]
- Research Grant Council of the Hong Kong Special Administrative Region [N_HKUST610/17]
- Shenzhen Science and Technology Innovation Commission [JCYJ20180507183818040]
- Guangdong Special Fund for Science and Technology Development (Hong Kong Technology Cooperation Funding Scheme) [201704030019, 201704030065]
- Overseas Expertise Introduction Project for Discipline Innovation of China (111 project) [B12015]
Increasing the number of active sites is critical for developing N-doped carbon electrocatalysts towards oxygen reduction reaction (ORR) in fuel cells and metal-air batteries applications. Herein, we prepared N-doped carbon nanotubes (N-CNT) with enriched pyridinic N and abundant defects resulted from the etching of KMnO4 of the precursor (polypyrrole). It was observed that the content of pyridinic N could be well controlled by regulating the etching time. The resultant catalyst displayed a superior ORR activity compared commercial Pt/C in an alkaline solution, which was further confirmed by home-made Zn-air batteries. Density functional theory (DFT) computations showed that the superior catalytic activity originated from the second nearest carbon atom to the pyridinic-N at the edge. This work provides a simple etching approach to alter the N configuration and the amount of defects in N-doped CNT, which can be extended to many other energy conversion materials.
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