期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 829, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.154558
关键词
Fe/N-C; Fe@FeNx; ORR; Fe3O4; Polypyrrole
资金
- National Natural Science Foundation of China [21776147, 61604086]
- Department of Science and Technology of Shandong Province [ZR2018BB066, 2016GGX104010]
- College Students' Innovative and Entrepreneurial Training Programs of Shandong Province [S201910426014, S201913997002]
- Qingdao Municipal Science and Technology Bureau, China [19-6-1-91-nsh]
- Department of Education of Shandong Province [J16LA14]
- Malmstrom Endowment Fund at Hamline University
Iron/nitrogen co-doped carbon materials (Fe/N-C) have been extensively investigated as oxygen reduction reaction (ORR) catalysts in alkaline medium. Here, Fe3O4 nanoparticles decorated carbon black is encapsulated with polypyrrole and subsequently utilized as a precursor to synthesize a highly efficient ORR catalyst through pyrolysis. Interestingly, this catalyst consists of yolk-shell Fe@FeNx and N-doped porous carbon, demonstrating a synergistically improved ORR activity. It shows better durability, Pt-comparable activity, and superior tolerance against methanol crossover under alkaline conditions. Control experiments confirm that yolk-shell Fe@FeNx nanoparticles provide efficient catalytic sites and facilitate charge transfer in ORRs. Thus, this study provides a new kind of Fe/N-C electrocatalyst synthesized to be nitride rather than carbide simply with a heat-treatment under N-2 atmosphere. (C) 2020 Elsevier B.V. All rights reserved.
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