Synergy between isolated Fe and Co sites accelerates oxygen evolution

Dual-metal catalysts with synergistic effect exhibit enormous potential for sustainable electrocatalytic applications and mechanism research. Compared with mono-metal-site catalysts, dual-metal-site catalysts exhibit higher efficiency for the oxygen evolution reaction (OER) due to reduced energy bar...

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Published in:Nano research 2023-02, Vol.16 (2), p.2218-2223
Main Authors: Tang, Tianmi, Duan, Zhiyao, Baimanov, Didar, Bai, Xue, Liu, Xinyu, Wang, Liming, Wang, Zhenlu, Guan, Jingqi
Format: Article
Language:English
Subjects:
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Chemistry and Materials Science
Condensed Matter Physics
Materials Science
Nanotechnology
Research Article
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Summary:Dual-metal catalysts with synergistic effect exhibit enormous potential for sustainable electrocatalytic applications and mechanism research. Compared with mono-metal-site catalysts, dual-metal-site catalysts exhibit higher efficiency for the oxygen evolution reaction (OER) due to reduced energy barrier of the process involving proton-coupled multi-electron transfer. Herein, we construct dual-metal Fe-Co sites coordinated with nitrogen in graphene (FeCo-NG), which exhibits high OER performance with onset overpotential of only 126 mV and Tafel slope of 120 mV·dec −1 , showing that the rate-determining step is controlled by the single-electron transfer step. Theoretical calculations reveal that the FeN 4 site exhibits lower OER overpotential than the CoN 4 site due to appropriate adsorption energy of OOH* on the former, while the O* adsorbed on the adjacent Co site could stabilize the OOH* on the FeN 4 site through hydrogen bond interaction.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-022-5001-3