Abstract
Photocatalytic reduction of CO2 to chemical fuels enables a sustainable way of reducing carbon emis-sions but faces a high reduction potential due to the high stability of CO2 molecules.Here,we prepared a SnO2/SnS2/Cu2SnS3 double Z-scheme heterojunction photocatalyst,in which SnO2,SnS2,and Cu2SnS3 absorb ultraviolet,visible,and near-infrared light,respectively.Based on the compre-hensive analysis of in-situ X-ray photoelectron spectroscopy and photo(chemical)characterizations,we find that the photogenerated electrons would transfer from SnO2 to SnS2 to Cu2SnS3.The optimized SnO2/SnS2/Cu2SnS3-0.3 double Z-scheme heterojunction could achieve 28.44 μmol g-1 h-1 ethanol yield and 92％selectivity,which is roughly 3 folds higher than SnO2/SnS2 single Z-scheme heterojunction.By using in-situ diffuse reflectance infrared Fourier-transform spectroscopy,we observe that ethanol is produced through a*COCOH pathway,in which Cu2SnS3 would decrease the activation energy barrier from*COOH to*CO.
基金项目
Basic Science Center Program for Ordered Energy Conversion of the National Natural Science Foundation of China(51888103)
Fundamental Research Funds for the Central Universities()
NETL
NSTL
万方数据