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Identification of active sites in nitrogen and sulfur co-doped carbon-based oxygen reduction catalysts
Li, Jin-Cheng; Qin, Xueping; Hou, Peng-Xiang; Cheng, Min; Shi, Chao; Liu, Chang; Cheng, Hui-Ming; Shao, Minhua
2019-06-01
Source PublicationCARBON
ISSN0008-6223
Volume147Pages:303-311
AbstractDifferent heteroatoms co-doped carbons are a burgeoning class of metal-free catalysts to replace Pt for the oxygen reduction reaction (ORR), but the lack of understanding of active sites delays their further improvement. Here we combined experimental designs and theoretical simulations with attempts to understand the correlation between N and/or S doping configurations and their catalytic activities. The results indicated that there is no obvious synergistic effect between N and S co-doping, in contrast with previous observations. S doping followed by N doping contributes to a large pyridinic N content in the catalyst due to the low formation energy for N to substitute doped S, leading to greatly enhanced ORR activity. Inversely, N doping followed by S doping takes pyridinic N away, resulting in an obvious ORR performance loss. Therefore, the doping sequence of S and N is crucial for the ORR activity of the co-doped catalysts. Furthermore, the pyridinic N is determined as the active functional group in N, S co-doped carbons by first-principle density functional theory calculations. (C) 2019 Elsevier Ltd. All rights reserved.
KeywordCo-doped carbon Doping configuration Active site Oxygen reduction
Indexed BySCI
Language英语
WOS IDWOS:000468156500035
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/81041
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Li, Jin-Cheng,Qin, Xueping,Hou, Peng-Xiang,et al. Identification of active sites in nitrogen and sulfur co-doped carbon-based oxygen reduction catalysts[J]. CARBON,2019,147:303-311.
APA Li, Jin-Cheng.,Qin, Xueping.,Hou, Peng-Xiang.,Cheng, Min.,Shi, Chao.,...&Shao, Minhua.(2019).Identification of active sites in nitrogen and sulfur co-doped carbon-based oxygen reduction catalysts.CARBON,147,303-311.
MLA Li, Jin-Cheng,et al."Identification of active sites in nitrogen and sulfur co-doped carbon-based oxygen reduction catalysts".CARBON 147(2019):303-311.
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