期刊
NANO LETTERS
卷 22, 期 12, 页码 4879-4887出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c01318
关键词
controllable solid-phase fabrication; microstructure modulation; Fe2O3/Fe5C2/Fe-N-C electrocatalyst; oxygen reduction reaction; zinc-air batteries
类别
资金
- National Natural Science Foundation of China [52102100, 22022505, 21872069]
- National Key R&D Program of China [2017YFA0208200]
- Fundamental Research Funds for the Central Universities [020514380266, 020514380272]
- Natural Science Foundation of Jiangsu Province [BK20181469, BK20180008]
- Scientific and Technological Innovation Special Fund for Carbon Peak and Carbon Neutrality of Jiangsu Province [BK20220008]
- 2021 Suzhou Gusu Leading Talent Program of Science and Technology Innovation and Entrepreneurship in Wujiang District
In this study, a hydrothermal-mimicking solid-phase system is established to fabricate novel Fe2O3/Fe5C2/Fe-N-C composites consisting of Fe2O3/Fe5C2 nanoparticles and Fe,N-doped carbon species with varying morphologies. The evolution mechanism and superior electrocatalytic behaviors of microspherical Fe2O3/Fe5C2/Fe-N-C-3 have been revealed, providing important insights for the design and optimization of advanced electrocatalysts.
Preparing advanced electrocatalysts via solid-phase reactions encounters the challengeo of low controllability for multiconstituent hybridization and microstructure modulation. Herein, a hydrothermal-mimicking solid-phase system is established to fabricate novel Fe2O3/Fe5C2/Fe-N-C composites consisting of Fe2O3/Fe5C2 nanoparticles and Fe,N-doped carbon species with varying morphologies. The evolution mechanism featuring a competitive growth of different carbon sources in a closed hypoxic space is elucidated for a series of Fe2O3/Fe5C2/Fe-N-C composites. The size and dispersity of Fe2O3/Fe5C2 nanoparticles, the graphitization degree of the carbonaceous matrix, and their diverse hybridization states lead to disparate electrocatalytic behaviors for the oxygen reduction reaction ORR). Among them, microspherical Fe2O3/Fe5C2/Fe-N-C-3 exhibits an optimal ORR performance and the as-assembled zinc-air battery shows all-round superiority to the Pt/C counterpart. This work presents a mild solid-phase fabrication technique for obtaining a variety of nanocomposites with effective control over composition hybridization and microstructural modulation, which is significantly important for the design and optimization of advanced electrocatalysts.
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