Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (10): 2539-2547.DOI: 10.1016/S1872-2067(21)64024-X

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Photocatalytic CO2 conversion of W18O49/CdSe-Diethylenetriamine with high charge transfer efficiency: Synergistic effect of LSPR effect and S-scheme heterojunction

Yue Huanga, Kai Daia,*(), Jinfeng Zhanga,#(), Graham Dawsonb   

  1. aKey Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education, College of Physics and Electronic Information, Huaibei Normal University, Huaibei 235000, Anhui, China
    bDepartment of Chemistry, Xi’an Jiaotong-Liverpool University, Suzhou 215123, Jiangsu, China
  • Received:2021-12-14 Accepted:2022-01-15 Online:2022-10-18 Published:2022-09-30
  • Contact: Kai Dai, Jinfeng Zhang
  • Supported by:
    National Natural Science Foundation of China(51572103);National Natural Science Foundation of China(51973078);Distinguished Young Scholar of Anhui Province(1808085J14);Major projects of Education Department of Anhui Province(KJ2020ZD005);Key Foundation of Educational Commission of Anhui Province(KJ2019A0595)

Abstract:

Non-stoichiometric W18O49 (WO) prepared by solvothermal method has excellent NIR absorption due to the localized surface plasmon resonance effect caused by oxygen vacancies. This has great potential in the field of using sunlight to convert carbon dioxide into organic fuels. In addition, through the amination of CdSe, the one-dimensional/two-dimensional step-scheme (S-scheme) WO/CdSe-diethylenetriamine (WO/CdSe-D) photocatalyst with electron transmission channels driven by visible light to NIR light is constructed by microwave solvothermal method. The LSPR of WO and the synergistic effect of coupling semiconductors to construct S-scheme heterojunctions can improve light utilization and achieve efficient charge carrier transfer efficiency. The optimized photocatalyst of 35%WO/CdSe-D has the best CO2 reduction performance compared to WO and CdSe-D, and the yield is 25.37 µmol h-1 g-1. X-ray photoelectron spectroscopy was used to verify the charge transfer path of the S-scheme WO/CdSe-D heterojunction. This work provides a possibility for the application of non-stoichiometric oxides rich in oxygen vacancies in the field of photocatalytic CO2 reduction.

Key words: S-Scheme, Photocatalytic CO2 reduction, W18O49, Localized surface plasmon resonance, Diethylenetriamine