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Issue 26, 2020
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Integrating single Ni sites into biomimetic networks of covalent organic frameworks for selective photoreduction of CO2

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Abstract

Selective photoreduction of CO2 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 CO2 to CO. The single Ni sites in the hexagonal pores of the COFs serve as active sites for CO2 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.

Graphical abstract: Integrating single Ni sites into biomimetic networks of covalent organic frameworks for selective photoreduction of CO2

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Supplementary files

Article information


Submitted
26 Mar 2020
Accepted
09 Jun 2020
First published
09 Jun 2020

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2020,11, 6915-6922
Article type
Edge Article

Integrating single Ni sites into biomimetic networks of covalent organic frameworks for selective photoreduction of CO2

X. Chen, Q. Dang, R. Sa, L. Li, L. Li, J. Bi, Z. Zhang, J. Long, Y. Yu and Z. Zou, Chem. Sci., 2020, 11, 6915
DOI: 10.1039/D0SC01747G

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