期刊
APPLIED SURFACE SCIENCE
卷 427, 期 -, 页码 626-634出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.08.222
关键词
Porous carbon; Metal-free electrocatalyst; Hydrothermal synthesis; Activation; Electrocatalysis; Oxygen reduction reaction
类别
资金
- Plan For Scientific Innovation Talent of Henan Province [174100510015]
- National Nature Science Foundation of China [51502082]
- Major Science and Technology Projects in Henan Province [152102210079]
- Scientific and Technologies Research Program of Henan Province [162102410047]
Onion-derived nitrogen, sulfur self-doped nanoporous carbon spheres (NSC) as efficient metal-free electrocatalyst were synthesized via a facile hydrothermal and subsequent pyrolysis process. The typical NSC with a high BET specific surface area of 1558 m(2) g(-1), contains 6.23 at.% N and 0.36 at.% S, and possesses high concentration of pyridinic and graphitic nitrogen species. Experimentally, the best performance was the NSC-A2 which showed excellent catalytic activity to oxygen reduction reaction via a 4 electron mechanism with an onset potential of 0.88 V (vs. RHE), and a superior stability comparable to commercial Pt/C catalyst. The high electrocatalytic activity is attributed to not only the synergistic effect of N and S dual doping in carbon and the sufficient active sites, but also its high BET specific surface area and suitable microporous structure. The results demonstrate that it is a simple and scalable approach for preparing efficient and low-cost carbon-based electrocatalysts for oxygen reduction reaction. (C) 2017 Published by Elsevier B.V.
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