Issue 46, 2023

Molecular engineering of donor–acceptor sp2-carbon-linked covalent organic frameworks for enhancing photocatalytic hydrogen production

Abstract

Donor–acceptor covalent organic frameworks (COFs) are promising photocatalysts due to their adjustable structures and band gaps. Meanwhile, constructing fully conjugated sp2-carbon-linked COFs can further promote charge carrier mobility. Herein, three sp2-carbon-linked D–A COFs (Ph-COF, Th-COF and TTh-COF) are successfully synthesized via a Knoevenagel condensation reaction using p-phenylene diacetonitrile as the acceptor and triphenylbenzene, trithiophenephenyl and benzotrithiophene as donors. By varying donor units, the band gaps, visible light absorption range and charge separation and transportation properties of the COFs are precisely regulated. Among these COFs, TTh-COF with the optimum-electron donor benzotrithiophene exhibits the narrowest band gap and the strongest built-in electric field, which induce excellent charge transfer, resulting in enhanced photocatalytic performance with an impressive hydrogen generation rate of 22.22 mmol g−1 h−1. This work provides an effective method to adjust the photocatalytic activity of COFs by changing the donor at the molecular level.

Graphical abstract: Molecular engineering of donor–acceptor sp2-carbon-linked covalent organic frameworks for enhancing photocatalytic hydrogen production

Supplementary files

Article information

Article type
Paper
Submitted
22 sept. 2023
Accepted
02 nov. 2023
First published
03 nov. 2023

Polym. Chem., 2023,14, 5133-5139

Molecular engineering of donor–acceptor sp2-carbon-linked covalent organic frameworks for enhancing photocatalytic hydrogen production

M. Xu, S. Yu, W. Li, C. Li, Y. Peng and F. Yu, Polym. Chem., 2023, 14, 5133 DOI: 10.1039/D3PY01069D

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