Journal
CHEMICAL ENGINEERING JOURNAL
Volume 399, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.125647
Keywords
Metal carbides; Pyrinidic nitrogen; Oxygen reduction reaction; Synergistic effect
Categories
Funding
- National Natural Science Foundation of China [51973009]
- Six Talent Peaks Project in Jiangsu Province [XCL-147]
- Changzhou Sci&Tech Program in Jiangsu Province [CJ20190008]
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Propelled by the demand of cost-effective and sustainable electrocatalysts, non-precious catalysts are beginning to spark tremendous interest. Among them, carbon-based materials are able to load various active sites ranging from metallic (Ni, Fe, Co, and Mn) and non-metallic elements (B, P, S, and N). In this study, a novel reactive core-double shell template strategy was exquisitely designed to synthesize Fe-C and Co-C hybrids anchored on Nitrogen-doped hollow carbon nanospheres (Fe/Co@NDHC). Fe3O4 microsphere plays as the core, and polyaniline (PANI) and zeolitic imidazolate framework-67 (ZIF-67) is the inner and outer shell, respectively. Thanks to the synergistic effect between interconnected multiple active sites and unique porous hollow structure, the as-prepared Fe/Co@NDHC exhibited an outstanding Oxygen Reduction Reaction (ORR) performance with a half-wave potential (E-1/2) of 0.918 V in alkaline media, as well as a superior tolerance to methanol and a long-term stability. The synergetic effects of Fe-C, Co-C and pyridinic-N active sites were further confirmed by density functional theory calculations. This reactive templated method offers a new way to fabricate heteroatom doped materials with a controlled morphology for diverse energy-related applications.
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