Orderly Drawing Photo-Thermal Synergistic Electron Flow for Efficient CO

Photocatalysis is a green promising approach for CO2 reduction. Metal sulfides are widely studied in this field due to the high-efficiency, however, most of them are prone to photo-corrosion. Herein, a stable and efficient Z-scheme heterojunction catalyst is reported, FexInySz/TiO2 owing an orderly drawing photo-thermal synergistic electron flow for CO2 reduction in a field experiment. The tests under natural sunlight conditions demonstrated that FexInySz/TiO2 has a stability of 4 natural days. The maximum photothermal energy conversion efficiency is 1.16%, which is the highest record under concentrated natural sunlight for CO2 reduction with pure water. The in situ rapid-scan XANES and XPS show the raising temperature and photo-irradiation synergistically stretch electrons from O to Fe, revealing the mechanism of thermal modulation to optimize the active sites for efficient and stable photocatalytic CO2 reduction. This work pioneers the stable and efficient reduction of CO2 under outdoor sunlight conditions, providing a theoretical foundation for the outdoor application of this technology.