Yolk–Shell‐Structured Cu/Fe@γ‐Fe2O3 Nanoparticles Loaded Graphitic Porous Carbon for the Oxygen Reduction Reaction |
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| Authors: | Meiwen Wang Chao Su Martin Saunders Ji Liang Zongping Shao Shaobin Wang Jian Liu |
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| Affiliation: | 1. Department of Chemical Engineering, Curtin University, Perth, WA, Australia;2. Centre for Microscopy, Characterisation and Analysis (CMCA), The University of Western Australia (M010), Crawley, WA, Australia;3. Institute for Superconducting & Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, Innovation Campus, North Wollongong, NSW, Australia;4. Department of Chemical and Process Engineering and Advanced Technology Institute, University of Surrey, Guildford, Surrey, UK |
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| Abstract: | Core–shell Cu/γ‐Fe2O3@C and yolk–shell‐structured Cu/Fe@γ‐Fe2O3@C particles are prepared by a facile synthesis method using copper oxide as template particles, resorcinol‐formaldehyde as the carbon precursor, and iron nitrate solution as the iron source via pyrolysis. With increasing carbonization temperature and time, solid γ‐Fe2O3 cores are formed and then transformed into Fe@γ‐Fe2O3 yolk–shell‐structured particles via Ostwald ripening under nitrogen gas flow. The composition variations are studied, and the formation mechanism is proposed for the generation of the hollow and yolk–shell‐structured metal and metal oxides. Moreover, highly graphitic carbons can be obtained by etching the metal and metal oxide nanoparticles through an acid treatment. The electrocatalytic activity for oxygen reduction reaction is investigated on Cu/γ‐Fe2O3@C, Cu/Fe@γ‐Fe2O3@C, and graphitic carbons, indicating comparable or even superior performance to other Fe‐based nanocatalysts. |
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| Keywords: | γ ‐Fe2O3 graphitic porous carbon nanocatalysts oxygen reduction reaction (ORR) yolk– shell particles |
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