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Citation: Wei Fu, Jiajie Fan, Quanjun Xiang. Ag2S Quantum Dots Decorated on Porous Cubic-CdS Nanosheets-assembled Flowers for Photocatalytic CO2 Reduction[J]. Chinese Journal of Structural Chemistry, ;2022, 41(6): 220603. doi: 10.14102/j.cnki.0254-5861.2022-0090 shu

Ag2S Quantum Dots Decorated on Porous Cubic-CdS Nanosheets-assembled Flowers for Photocatalytic CO2 Reduction

  • 1.

    State Key Laboratory of Electronic Thin Film and Integrated Devices, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China

  • 2.

    School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China

  • Corresponding author: Quanjun Xiang, xiangqj@uestc.edu.cn
  • Received Date: 20 April 2022
    Accepted Date: 13 May 2022

Figures(10)

  • The production of renewable fossil fuels such as CH4 and CO by photocatalytic CO2 reduction has attracted more and more attention. However, single photocatalyst is less efficient for photocatalytic reduction of CO2 due to the fast recombination of photogenerated electron pairs. Herein, we successfully prepare CdS-Ag2S composite by assembling the Ag2S QDs cocatalyst on the surface of CdS nanosheet-assembled flower through oil-bath solvothermal method. This composite is prepared through a simple self-assembly strategy using cadmium chloride, ammonia and thiourea as precursors of the CdS nanosheet-assembled flower and silver nitrate and 3-mercaptopropionic acid as the precursors of Ag2S QDs. The average diameter of Ag2S QDs is apparently 6.0 nm. The light absorption edge of the composite is at around 560 nm, with the corresponding band gap at 2.14 eV. The CdS-Ag2S QDs composite with 5 wt% Ag2S QDs loaded achieves CO evolution rate of 16.6 μmol·g-1·h-1 without noble-metal cocatalysts. This strengthened photocatalytic performance and photocatalytic stability were attributed to the energy band broadening of Ag2S QDs caused by quantum size effect and the large specific surface area due to the assembled flower. The mechanism underlying the enhanced photocatalytic CO2 reduction activity is further proposed. This study demonstrates that semiconductor-based quantum dots are strong candidates for excellent cocatalysts in photocatalysis.
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