Issue 17, 2022

Covalent triazine-based frameworks with cobalt-loading for visible light-driven photocatalytic water oxidation

Abstract

Conjugated polymers have received significant attention as photocatalysts. However, photocatalytic oxygen evolution has only been reported for a few polymers so far. Here, we present a bipyridine based covalent triazine-based framework containing metal coordination sites (Bpy-CTF). The material is highly active for sacrificial photocatalytic oxygen evolution with a rate of 322 μmol g−1 h−1 under visible light illumination (≥420 nm) after post-synthetic cobalt coordination. An analogous photocatalyst containing biphenyl was found to be less active as it is not able to coordinate cobalt. Transient absorption spectroscopy studies showed that the cobalt coordinated in the bipyridine units of Bpy-CTF promotes charge separation and transfer, thus increasing water oxidation activity. The study demonstrates the growing potential of polymer photocatalysts for oxygen evolution by structural engineering and post-synthetic metalation.

Graphical abstract: Covalent triazine-based frameworks with cobalt-loading for visible light-driven photocatalytic water oxidation

Supplementary files

Article information

Article type
Paper
Submitted
23 Apr 2022
Accepted
27 Jul 2022
First published
27 Jul 2022
This article is Open Access
Creative Commons BY license

Catal. Sci. Technol., 2022,12, 5442-5452

Covalent triazine-based frameworks with cobalt-loading for visible light-driven photocatalytic water oxidation

H. Chen, A. M. Gardner, G. Lin, W. Zhao, M. Bahri, N. D. Browning, R. S. Sprick, X. Li, X. Xu and A. I. Cooper, Catal. Sci. Technol., 2022, 12, 5442 DOI: 10.1039/D2CY00773H

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