期刊
JOURNAL OF CATALYSIS
卷 405, 期 -, 页码 634-640出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2021.10.011
关键词
CO2 reduction reaction; Electrochemical hydrogen pump reactor; Co-C coordination; Coordination environment; Density functional theory (DFT)
资金
- National Science Foundation of China [21776034, 22021005, U1663223]
- National Key Research and Development Program of China [2019YFE0119200]
- MOST innovation team in key areas [2016RA4053]
- Fundamental Research Funds for the Central Universities [DUT21TD406, DUT20LAB307]
- Liaoning Key Laboratory of Chemical Additive Synthesis and Separation [ZJKF2012]
In this study, tunable Co single-atom catalysts were fabricated and the effect of metal-C coordination on catalyzing CO2 reduction reaction was investigated. The experimental results showed that the CO Faradaic efficiency of the catalysts could be significantly enhanced by adjusting the ratio of metal-N/C sites. Further theoretical calculations revealed that increasing the Co-C coordination ratio could enrich the electron density of Co atoms and promote the adsorption of *COOH.
Single-atom catalysts (SACs) with well-defined active sites provide an efficient route for catalyzing CO2 reduction reaction (CO2RR). Although enormous attention has been focused on metal-Nx moieties, understanding the effect of metal-C coordination and engineering of the hybrid metal-N/C sites have rarely been reported. Herein, we fabricated Co SACs with tunable isolated Co-N5-xCx (x = 1, 2, 3) sites supported on porous carbon frameworks. Benefiting from the difference in electronegativity of the coordinated N and C atoms, the CO Faradaic efficiency (FECO) enhanced considerably from 54% to 76% and 92% at-0.8 V vs. RHE for Co-N4C1, Co-N3C2, and Co-N2C3, respectively. Further density functional theory (DFT) calculations uncover that the increased ratio of Co-C coordination induced electron enrichment of Co atoms and upper-shift the d-band center to near Fermi level, and thus favorably promotes the electron-donating ability of Co centers and strengthens the adsorption of *COOH. (C) 2021 Elsevier Inc. All rights reserved.
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