期刊
CARBON
卷 122, 期 -, 页码 114-121出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2017.06.044
关键词
N, S-codoped; Exfoliated carbon nanosheets; Electrocatalyts; Oxygen reduction reaction
资金
- High-level University Construction Fund [g200906-22]
- National Nature Science Foundation (NSFC) of China [21403227]
- Technology Planning Project of Guangdong Province [2015B090927007]
The pursuit of porous carbonaceous materials with large specific surface area, well-defined pore structure and desirable dopants remain challenges for both energy storage and conversion. Here, we fabricate a novel interconnected N, S-codoped porous exfoliated carbon nanosheets (ECNs) with large specific area and pore volume through a one-step carbonization process by using glucose/melamine-sulphate-salt (GMSS) as precursor. By carefully examining the carbonization process of the precursor, we propose a phase separation mechanism for the formation of ECNs. The optimized sample, composed of interconnected thin graphite layers with N and S co-doping in the carbon lattice, exhibits outstanding ORR activity in terms of half-wave potential (0.83 V vs. RHE) and onset potential (0.97 V vs. RHE), together with 4-electron selectivity (H2O2 yield less than 8%), one of the best among all reported metal-free ORR catalysts. (C) 2017 Elsevier Ltd. All rights reserved.
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