Donor-acceptor moiety functionalized covalent organic frameworks for boosting charge separation and H photogeneration.

J Colloid Interface Sci

Advanced Catalytic Engineering Research Center of the Ministry of Education, Department of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China. Electronic address:

Published: March 2024

Covalent organic frameworks (COFs) have a broad prospect to be used as a photocatalytic platform to convert solar energy into valuable chemicals due to their tunable structures and rich active catalytic sites. However, constructing COFs with tuned sp-carbon donor-acceptor moiety remains an enormous challenge. Herein, we synthesized two new fully π-conjugated cyano-ethylene-linked COFs containing benzotrithiophene as functional group by Knoevenagel polycondensation reaction. The accetpor 2,2'-bipyridine unit in BTT-BpyDAN-COF skeleton favored the formation of a intermolecular specific electron transport pathway with the donor benzotrithiophene, and thereby promoted charge separation and transfer efficiency. Specifically, a donor-acceptor (D-A) type BTT-BpyDAN-COF exhibited high hydrogen evolution rate of 10.1 mmol gh and an excellent apparent quantum efficiency of 4.83 % under visible light irradiation.

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http://dx.doi.org/10.1016/j.jcis.2023.12.109DOI Listing

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