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Photoreduction of CO 2 into solar fuels is an appealing solution to simultaneously mitigate environmental problems and energy crisis, but photocatalyst activity and product selectivity remain challenging. Herein, ultrafine Pd nanoparticles immobilized in an imine-linked covalent triazine framework ( email protected ) are successfully prepared via a wet-chemistry approach. The resultant email protected exhibits a highly porous structure, which exposes more active sites and promotes CO 2 adsorption and diffusion for photocatalysis. The ultrasmall Pd nanoparticles are confined and stabilized because of the strong interaction between Pd and pyridinic nitrogen atoms within Imine-CTF, which is beneficial for boosting the charge carrier separation and providing ideal sites for CO 2 reduction reactions. Under visible-light irradiation, email protected displays excellent photocatalytic performance toward CO 2 reduction, yielding CO and CH 4 with evolution rates of 85.3 and 21.1 μmol g –1 h –1, respectively, and with a remarkable selectivity of up to 91.8%. This work provides a new protocol for the rational design of CTF-based photocatalyst composites for efficient CO 2 conversion.
Guo et al. (Sun,) studied this question.