首页|Double Z-scheme in SnO2/SnS2/Cu2SnS3 heterojunction for photocatalytic reduction of CO2 to ethanol
Double Z-scheme in SnO2/SnS2/Cu2SnS3 heterojunction for photocatalytic reduction of CO2 to ethanol
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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.
International Research Center for Renewable Energy,State Key Laboratory of Multiphase Flow,Xi'an Jiaotong University,Xi'an 710049,China
Basic Science Center Program for Ordered Energy Conversion of the National Natural Science Foundation of ChinaFundamental Research Funds for the Central Universities
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