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Abstract:
Selective photoreduction of CO(2)into a given product is a great challenge but desirable. Inspired by natural photosynthesis occurring in hierarchical networks over non-precious molecular metal catalysts, we demonstrate an integration of single Ni sites into the hexagonal pores of polyimide covalent organic frameworks (PI-COFs) for selective photoreduction of CO(2)to CO. The single Ni sites in the hexagonal pores of the COFs serve as active sites for CO(2)activation and conversion, while the PI-COFs not only act as a photosensitizer to generate charge carriers but also exert a promoting effect on the selectivity. The optimized PI-COF with a triazine ring exhibits excellent activity and selectivity. A possible intra- and inter-molecular charge-transfer mechanism was proposed, in which the photogenerated electrons in PI-COFs are efficiently separated from the central ring to the diimide linkage, and then transferred to the single Ni active sites, as evidenced by theoretical calculations.
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CHEMICAL SCIENCE
ISSN: 2041-6520
Year: 2020
Issue: 26
Volume: 11
Page: 6915-6922
9 . 8 2 5
JCR@2020
7 . 6 0 0
JCR@2023
ESI Discipline: CHEMISTRY;
ESI HC Threshold:160
JCR Journal Grade:1
CAS Journal Grade:2
Cited Count:
WoS CC Cited Count: 95
SCOPUS Cited Count: 62
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 1