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<p>Heterostructured photocatalysts are promising candidate materials in the field of photocatalysis. Heterojunctions play an important role in the separation of carriers in space. In this study, a 0D/2D step (S)-scheme heterojunctions were prepared by <i>in-situ</i> growth of Ag<sub>2</sub>S nanoparticles (NPs) onto porous graphite (g)-C<sub>3</sub>N<sub>4</sub> nanosheets. Ag<sub>2</sub>S NPs effectively shortened the diffusion path of carriers, thus promoting interfacial charge migration and further improving surface photocatalytic activity. X-Ray photoelectron spectroscopy and photoelectrochemical tests indicated an internal electric field formed at the g-C<sub>3</sub>N<sub>4</sub>/Ag<sub>2</sub>S interface, which enabled efficient separation and enhanced the photocatalytic CO<sub>2</sub> reduction activity while preserving the maximum redox capacity of photogenerated carriers. Under the irradiation of visible light, the CO yield of Ag<sub>2</sub>S/g-C<sub>3</sub>N<sub>4</sub> composites was about 17.24 µmol·g<sup>−1</sup>·h<sup>−1</sup> and their CH<sub>4</sub> yield was about 2.36 µmol·g<sup>−1</sup>·h<sup>−1</sup>, both of which were better than those of Ag<sub>2</sub>S and g-C<sub>3</sub>N<sub>4</sub>. This work provides new insights into novel structures of S-scheme heterojunctions for photocatalytic CO<sub>2</sub> reduction.</p>

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Step-scheme 0D/2D Heterojunctions Based on Ag2S Nanoparticles/Graphite-C3N4 Nanosheets with Enhanced Visible-light Photocatalytic CO2 Reduction Performance

  • 期刊论文

  • 发表日期：

    2025年12月15日

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  • Jian Wang,
  • Xin Li,
  • Xin Qu,
  • Bo Feng,
  • Xuefei Li,
  • Yanqing Liu,
  • Maobin Wei

摘要

Heterostructured photocatalysts are promising candidate materials in the field of photocatalysis. Heterojunctions play an important role in the separation of carriers in space. In this study, a 0D/2D step (S)-scheme heterojunctions were prepared by in-situ growth of Ag2S nanoparticles (NPs) onto porous graphite (g)-C3N4 nanosheets. Ag2S NPs effectively shortened the diffusion path of carriers, thus promoting interfacial charge migration and further improving surface photocatalytic activity. X-Ray photoelectron spectroscopy and photoelectrochemical tests indicated an internal electric field formed at the g-C3N4/Ag2S interface, which enabled efficient separation and enhanced the photocatalytic CO2 reduction activity while preserving the maximum redox capacity of photogenerated carriers. Under the irradiation of visible light, the CO yield of Ag2S/g-C3N4 composites was about 17.24 µmol·g−1·h−1 and their CH4 yield was about 2.36 µmol·g−1·h−1, both of which were better than those of Ag2S and g-C3N4. This work provides new insights into novel structures of S-scheme heterojunctions for photocatalytic CO2 reduction.