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

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 mu mol 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.

Automated summary

In this study, a bipyridine based covalent triazine-derived framework (Bpy-CTF) with metal coordination sites is used as a photocatalyst for oxygen evolution. After post-synthetic cobalt coordination, the material exhibits high sacrificial photocatalytic oxygen evolution activity under visible light illumination. Transient absorption spectroscopy studies reveal that the cobalt coordination promotes charge separation and transfer, enhancing water oxidation activity. This research demonstrates the potential of polymer photocatalysts for oxygen evolution through structural engineering and post-synthetic metalation.