![]() The boosting CO 2 photoreduction activity could be credited to the special charge carrier separation in S-scheme heterojunction, which can accelerate photogenerated electrons transportation and improve the redox ability at the interface. The photogenerated electrons transfer route was proposed to follow the typical step-scheme (S-scheme), which was affirmed by XPS, in situ XPS and EPR characterizations. The optimized TTCOF/NUZ exhibited a superior CO yield (6.56 μmol g –1 h –1) in gas–solid system when irradiated by visible light and only with H 2O (g) as weak reductant, and it was 4.4 and 5 times higher than pristine TTCOF and NUZ, respectively. ![]() Herein, we propose a novel covalent organic framework/metal organic framework (COF/MOF) heterojunction photocatalyst, using olefin (C═C) linked covalent organic framework (TTCOF) and NH 2–UiO-66 (Zr) (NUZ) as representative building blocks, for enhanced CO 2 reduction to CO. The interfacial engineering of heterojunction photocatalysts could be a valid approach to boost the efficiency of the catalytic process. Yet the exploration of highly efficient, selective, stable, and environmental benign photocatalysts for CO 2 reduction remains a major issue and challenge. Solar-driven photoreduction of CO 2 into valuable fuels offers a sustainable technology to relieve the energy crisis as well as the greenhouse effect.
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