Sulfur defect induced Cd 0.3 Zn 0.7 S in-situ anchoring on metal organic framework for enhanced photothermal catalytic CO 2 reduction to prepare proportionally adjustable syngas

The rapid recombination of interfacial charges is considered to be the main obstacle limiting the photocatalytic CO 2 reduction. Thus, it is a challenge to research an accurate and stable charge transfer control strategy. MIL-53 (Al)-S/Cd 0.3 Zn 0.7 S (MAS/CZS-0.3) photocatalysts with chemically bonded interfaces were constructed by in-situ electrostatic assembly of sulfur defect Cd 0.3 Zn 0.7 S (CZS-0.3) on the surface of MIL-53 (Al) (MAW), which enhanced interfacial coupling and accelerated electron transfer efficiency. An adjustable proportion of syngas (H 2 /CO) was prepared by photothermal catalytic CO 2 reduction at micro-interface. and the optimal yield of CO (66.10 μmol∙g −1 ∙h −1 ) and H 2 (71.0 μmol∙g −1 ∙h −1 ) was realized by the MAS/CZS-0.3 photocatalyst. The improved activity was due to the photogenerated electrons migrated from CZS-0.3 to the adsorption active sites of MAS, which strengthened the adsorption and activation of CO 2 on MAS. The photothermal catalytic CO 2 reduction to CO follows the pathway of CO 2 →*COOH → CO and CO 2 →*HCO 3 – →CO. This work provided a reference for the research, characterization, and application of in-situ anchoring of metal organic frameworks in photothermal catalytic CO 2 reduction, and provided a green path for the supply of Syngas in industry.