期刊
ADVANCED SCIENCE
卷 5, 期 7, 页码 -出版社
WILEY
DOI: 10.1002/advs.201800120
关键词
hollow carbon; iron carbide; nitrogen doping; oxygen reduction reaction; triblock copolymer templates
资金
- Australian Research Council (ARC) [FT150100479]
- JSPS KAKENHI [17H05393, 17K19044]
- Qingdao University of Science and Technology
- National Research Foundation of Korea (NRF) grant - Korea government (MSIP) [NRF-2017R1A2B3004383]
- International Energy Joint R&D Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) from the Ministry of Trade, Industry & Energy, Republic of Korea [20168510011350]
Sub-50 nm iron-nitrogen-doped hollow carbon sphere-encapsulated iron carbide nanoparticles (Fe3C-Fe,N/C) are synthesized by using a triblock copolymer of poly(styrene-b-2-vinylpyridine-b-ethylene oxide) as a soft template. Their typical features, including a large surface area (879.5 m(2) g(-1)), small hollow size (approximate to 16 nm), and nitrogen-doped mesoporous carbon shell, and encapsulated Fe3C nanoparticles generate a highly active oxygen reduction reaction (ORR) performance. Fe3C-Fe,N/C hollow spheres exhibit an ORR performance comparable to that of commercially available 20 wt% Pt/C in alkaline electrolyte, with a similar half-wave potential, an electron transfer number close to 4, and lower H2O2 yield of less than 5%. It also shows noticeable ORR catalytic activity under acidic conditions, with a high half-wave potential of 0.714 V, which is only 59 mV lower than that of 20 wt% Pt/C. Moreover, Fe3C-Fe,N/C has remarkable long-term durability and tolerance to methanol poisoning, exceeding Pt/C regardless of the electrolyte.
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