Abstract
Photocatalytic CO2 reduction is a promising solution to simultaneously provide renewable chemical fuels and address the greenhouse effect. However, designing practical photocatalysts with advanced architectures remains challenging. Herein, we report the preparation of a novel CdIn2S4/TiO2 binary heterojunction via an in situ solvothermal approach, which exhibits superior photocatalytic activity for sunlight-driven CO2 reduction. The CdIn2S4/TiO2 composites exhibit significantly enhanced photocatalytic performance for CO2 reduction compared to unmodified TiO2. Among them, the 3% CdIn2S4/TiO2 composite has optimal CO and CH4 evolution rates of 18.32 and 1.03 µmol·g−1·h−1, respectively. The yield of CO is 4.7 times higher than that of pristine TiO2. This improved photocatalytic activity of the CdIn2S4/TiO2 heterostructure can be attributed to its large surface area, extended light absorption range and high separation efficiency of photogenerated electron-hole pairs, which are supported by the results of photoluminescence spectroscopy and the photoelectrochemical measurements. Moreover, the photocatalytic mechanism based on the binary CdIn2S4/TiO2 heterojunction is proposed and separation process of photogenerated electron-hole pairs is discussed. In brief, we aim to provide insights into the application of TiO2 in energy conversion processes through the construction of heterogeneous junctions.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (Grant No. 21663027), the Key Research and Development Program of Gansu Province (Grant No. 21YF5GA068), the Innovative Research Team for Science and Technology of Shaanxi Province (Grant No. 2022TD-04) and Industry Supporting Project for Gansu Institution of Higher Learning (Grant No. 2021CYZC-26).
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Electronic Supplementary Material: Facile fabrication of CdIn2S4/TiO2 heterojunction forenhanced solar light efficient CO2 reduction
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Ma, X., Wang, L., She, H. et al. Facile fabrication of CdIn2S4/TiO2 heterojunction for enhanced solar light efficient CO2 reduction. Front. Chem. Sci. Eng. 18, 105 (2024). https://doi.org/10.1007/s11705-024-2456-7
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DOI: https://doi.org/10.1007/s11705-024-2456-7