Enhanced Solar Conversion of CO2 to CO Using Mn-doped TiO2 Based on Photo-thermochemical Cycle

摘要

Photo-thermochemical cycle(PTC)is a promising method to converting CO2 to solar fuels.To study the mechanism of CO2 reduction based on PTC,sol-gel synthesized titanium dioxide(ST)and Mn-doped TiO2(MT)films were produced and applied to the PTC under simulated solar light irradiation.Commercial P25(PT)was used as a reference.Experiments show that Mndoped TiO2 produced more CO than undoped TiO2 and P25.The average CO production of 1.0 wt% MT by the PTC was 32.19 μmol·m~(-2)·h~(-1)),4.36 times than that of ST and 3.63 times that of PT.Various characterization methods were conducted to investigated the effect of Mn ions doping on the photoresponse and charge transfer of samples.Density functional theory(DFT)calculations were also performed to verify the analysis and enhance the PTC mechanism.In conclusion,several key factors that Mn ions promote CO2 conversion have been clarified.