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Abstract:
Designing atomic defects engineering is significant for boosting the activity of metal catalytic sites. Herein, we constructed Fe-N4 sites on defective N-doped carbon catalyst (Fe-N4/def-CN) by in-situ ZnO thermal etching strategy. Compared with defect-free Fe-N4/CN, Fe-N4/def-CN had a half-wave potential (E1/2) of 0.920 V vs RHE for alkaline ORR with 50 mV increasing. We directly observed the ZnO in-situ disappearance, studied ZnO thermal etching effect on CN substrate and revealed the mechanism of carbon defect formation by in-situ envi-ronmental transmission electron microscopy (ETEM) and in-situ X-ray diffraction (XRD) measurements. Density functional theory (DFT) calculations demonstrated the easier formation of double carbon-atoms defects adjacent to Fe-N4 sites. The carbon-atoms defects and Zn-atom vacancies synergistically improved the ORR activity of Fe -N4 sites. This work provides a atomic-level insight to optimize the atomic defects engineering of metal-N4 sites, such as carbon-atoms defects and metal-atoms vacancies by in-situ ZnO thermal etching strategy.
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Source :
CHEMICAL ENGINEERING JOURNAL
ISSN: 1385-8947
Year: 2023
Volume: 465
1 5 . 1 0 0
JCR@2022
ESI Discipline: ENGINEERING;
ESI HC Threshold:19
Cited Count:
SCOPUS Cited Count: 21
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 0
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