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<p>Photocatalytic CO<sub>2</sub> reduction reaction (CO<sub>2</sub> RR) is usually limited by the weak adsorption capacity of the catalyst for CO<sub>2</sub> as well as the low product selectivity. In this paper, the electronic properties and catalytic reactive sites of CdIn<sub>2</sub>S<sub>4</sub> surface atoms are modulated by Cu doping. Experimental and theoretical calculations show that the coordination environment around the Cd atoms changes due to the charge balance effect after Cu doping, which induces the formation of sulfur vacancies. The sulfur vacancies not only enhanced the adsorption capacity of CO<sub>2</sub>, but also acted as charge—enriched centres to provide electrons to the Cu reactive sites and stabilized the reaction intermediates, which led to the highly selective generation of CH<sub>4</sub>. Cu-doped CdIn<sub>2</sub>S<sub>4</sub> catalysts exhibited excellent performance in photocatalytic reduction of CO<sub>2</sub>, and the CH<sub>4</sub> yield of 47.01 μmol·g<sup>–1</sup>·h<sup>–1</sup> with a selectivity of 97.8%. In this study, the synergistic interaction between sulfur vacancies and metal reactive sites enhances the adsorption and activation of CO<sub>2</sub> and effectively regulates the charge transfer process, providing a new strategy for optimising the performance of semiconductor photocatalysts.</p>

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Fabricated Cu-doping and Sulfur Vacancies of CdIn2S4 Nanoflowers with co-Engineering Active Sites for Selective Photoreduction of CO2 to CH4

  • 期刊论文

  • 发表日期：

    2025年7月8日

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  • Bingqing Chang,
  • Mengyang Xu,
  • Jinze Li,
  • Xiang Liu,
  • Jisheng Zhang,
  • Weiqiang Zhou,
  • Yining Zhang,
  • Chenlong Yan,
  • Huiqin Wang,
  • Pengwei Huo

摘要

Photocatalytic CO2 reduction reaction (CO2 RR) is usually limited by the weak adsorption capacity of the catalyst for CO2 as well as the low product selectivity. In this paper, the electronic properties and catalytic reactive sites of CdIn2S4 surface atoms are modulated by Cu doping. Experimental and theoretical calculations show that the coordination environment around the Cd atoms changes due to the charge balance effect after Cu doping, which induces the formation of sulfur vacancies. The sulfur vacancies not only enhanced the adsorption capacity of CO2, but also acted as charge—enriched centres to provide electrons to the Cu reactive sites and stabilized the reaction intermediates, which led to the highly selective generation of CH4. Cu-doped CdIn2S4 catalysts exhibited excellent performance in photocatalytic reduction of CO2, and the CH4 yield of 47.01 μmol·g–1·h–1 with a selectivity of 97.8%. In this study, the synergistic interaction between sulfur vacancies and metal reactive sites enhances the adsorption and activation of CO2 and effectively regulates the charge transfer process, providing a new strategy for optimising the performance of semiconductor photocatalysts.