Abstract
• CoPi was used as the cocatalyst to trap holes for the photocatalytic CO 2 reduction. • TiO 2 /CoPi exhibits much higher CO 2 adsorption capacity than pristine TiO 2 . • The CO 2 photo-reduction efficiency of TiO 2 /CoPi is higher compared to that of TiO 2 . • CoPi suppresses the recombination of photogenerated electrons and holes. As far as we know, the CO 2 photoconversion reaction with H 2 O includes two important steps. One step is CO 2 photoreduction (photogenerated electrons) while the other step is the oxidation of water (photogenerated holes). It is obvious that the oxidation of water is also the key step in the CO 2 photoconversion reaction. However, little research has been done to improve the oxidation of water, thereby indirectly improving the photocatalytic CO 2 reduction property of TiO 2 . Moreover, CO 2 adsorption capacity is also considered as an important limiting factor for the CO 2 photoconversion activity. Therefore, in this paper, CoPi (an amorphous cobalt-phosphate-based material) with high CO 2 adsorption capacity was successfully immobilized on the surface of TiO 2 nanosheets and served as a hole-cocatalyst to trap holes, thereby delaying the recombination of photogenerated electrons and holes and providing more CO 2 gas to take part in the CO 2 reduction reaction. Hence, the TiO 2 /CoPi exhibited much better CO 2 photoconversion performance in water compared to pristine TiO 2 .
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