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<p>Renewable and alternative energy has received great research regarding the challenges produced by environmental and energy problems. Glycerol, a typical wastewater pollutant, is used to produce simultaneous clean water and hydrogen production over the synthesized photocatalysts. Herein, a novel ZnO nanosheet was constructed via the hydrothermal process utilizing ethylene glycol and polyvinylpyrrolidone. MoS<sub>2</sub> NPs were regularly decorated on the surface of ZnO nanosheets with spherical diameters (10–20&#xa0;nm) to build heterojunction MoS<sub>2</sub>/ZnO nanocomposites. MoS<sub>2</sub> NPs were accommodated onto the ZnO nanosheet to extend the absorbance ability in the visible spectrum. The optimum 9% MoS<sub>2</sub>/ZnO nanocomposite showed the highest H<sub>2</sub> evolution rate is 2793.6 µmol g<sup>− 1</sup> h<sup>− 1</sup>, upon visible illumination, which was about 98 and 10.9 folds larger than ZnO sheet (28.4 µmol g<sup>− 1</sup> h<sup>− 1</sup>) and MoS<sub>2</sub> (255.79 µmol g<sup>− 1</sup> h<sup>− 1</sup>). The results demonstrated that the charge transport between MoS<sub>2</sub> and ZnO followed the S-scheme mechanism, which boosted the photocatalytic performance. Additionally, the S-scheme heterojunction of the MoS<sub>2</sub>/ZnO nanocomposite provides plentiful active sites for H<sub>2</sub> evolution. The enhancement of the photocatalytic activity over the MoS<sub>2</sub>/ZnO nanocomposite can be attributed to the lower scattering light in mesostructure, fast mobility of glycerol to the reactive sites, and synergetic effect, which accelerates the transportation of photoinduced charge carriers. The present research is a favorable route for developing high-ability and cost-effective ZnO-based heterojunctions and offers characteristic perspectives on the route of producing renewable H<sub>2</sub> energy.</p>

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Fabrication of Heterojunction MoS2/ZnO Nanosheets as Active Photocatalyst for H2 Evolution Through Glycerol Reforming

  • 期刊论文

  • 发表日期：

    2025年3月26日

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  • R. M. Mohamed,
  • L. A. Al-Hajji,
  • Adel A. Ismail,
  • Naif S. Aljohani,
  • Soad Z. Alsheheri

摘要

Renewable and alternative energy has received great research regarding the challenges produced by environmental and energy problems. Glycerol, a typical wastewater pollutant, is used to produce simultaneous clean water and hydrogen production over the synthesized photocatalysts. Herein, a novel ZnO nanosheet was constructed via the hydrothermal process utilizing ethylene glycol and polyvinylpyrrolidone. MoS2 NPs were regularly decorated on the surface of ZnO nanosheets with spherical diameters (10–20 nm) to build heterojunction MoS2/ZnO nanocomposites. MoS2 NPs were accommodated onto the ZnO nanosheet to extend the absorbance ability in the visible spectrum. The optimum 9% MoS2/ZnO nanocomposite showed the highest H2 evolution rate is 2793.6 µmol g− 1 h− 1, upon visible illumination, which was about 98 and 10.9 folds larger than ZnO sheet (28.4 µmol g− 1 h− 1) and MoS2 (255.79 µmol g− 1 h− 1). The results demonstrated that the charge transport between MoS2 and ZnO followed the S-scheme mechanism, which boosted the photocatalytic performance. Additionally, the S-scheme heterojunction of the MoS2/ZnO nanocomposite provides plentiful active sites for H2 evolution. The enhancement of the photocatalytic activity over the MoS2/ZnO nanocomposite can be attributed to the lower scattering light in mesostructure, fast mobility of glycerol to the reactive sites, and synergetic effect, which accelerates the transportation of photoinduced charge carriers. The present research is a favorable route for developing high-ability and cost-effective ZnO-based heterojunctions and offers characteristic perspectives on the route of producing renewable H2 energy.