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<p>Heterojunction photocatalysts continues to be promising for photocatalytic applications due to the synergistic interactions among the integrated materials. In the present work, multifunctional quaternary Ag–BiVO₄/TiO₂@RGO Z-scheme heterostructure was synthesized <i>via</i> a multi-step wet-chemical method and its performance was evaluated for hydrogen evolution reaction and dye degradation under visible-light. The structural analyses revealed the 2D reduced graphene oxide (RGO) sheets served as suitable substrate surface which enabled the fine dispersion of TiO<sub>2</sub>-nanotubes, BiVO<sub>4</sub> and Ag particles. Thus, intimate contact among the components were well established resulting in enhanced charge transport and structural stability. The heterostructure was proficient for the complete degradation of methylene blue (3&#xa0;h) and a high hydrogen evolution rate of 5523 µmol h⁻¹ g⁻¹ with glycerol as sacrificial agent was achieved. The superior performance of this composite is primarily attributed to Z-scheme charge transfer mechanism, which involves the rapid electron migration from conduction band of BiVO<sub>4</sub> to valence band of TiO<sub>2</sub> mediated by Ag particles. The 2D RGO channelizes the migration of electrons from conduction band of TiO<sub>2</sub> to generate superoxide radicals which mediated the degradation mechanism and also triggered the hydrogen evolution reaction. Furthermore, the heterojunction displayed excellent electrochemical sensing performance towards dopamine with a low detection limit of ~ 1.15 µM. This work demonstrates a viable strategy for sustainable energy conversion, environmental remediation, and electrochemical sensing applications utilizing the intricate heterojunctions.</p> Graphical Abstract <p></p>

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Enhanced photocatalytic performances of Ag-BiVO4/TiO2@RGO-based Z-scheme heterojunction

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Abhijna,
  • Udayabhanu,
  • Priyadarshini HN,
  • Appu S,
  • Anusha BR,
  • Sangamesha MA,
  • K Prashantha,
  • Nagaraju G,
  • S. Girish Kumar

摘要

Heterojunction photocatalysts continues to be promising for photocatalytic applications due to the synergistic interactions among the integrated materials. In the present work, multifunctional quaternary Ag–BiVO₄/TiO₂@RGO Z-scheme heterostructure was synthesized via a multi-step wet-chemical method and its performance was evaluated for hydrogen evolution reaction and dye degradation under visible-light. The structural analyses revealed the 2D reduced graphene oxide (RGO) sheets served as suitable substrate surface which enabled the fine dispersion of TiO2-nanotubes, BiVO4 and Ag particles. Thus, intimate contact among the components were well established resulting in enhanced charge transport and structural stability. The heterostructure was proficient for the complete degradation of methylene blue (3 h) and a high hydrogen evolution rate of 5523 µmol h⁻¹ g⁻¹ with glycerol as sacrificial agent was achieved. The superior performance of this composite is primarily attributed to Z-scheme charge transfer mechanism, which involves the rapid electron migration from conduction band of BiVO4 to valence band of TiO2 mediated by Ag particles. The 2D RGO channelizes the migration of electrons from conduction band of TiO2 to generate superoxide radicals which mediated the degradation mechanism and also triggered the hydrogen evolution reaction. Furthermore, the heterojunction displayed excellent electrochemical sensing performance towards dopamine with a low detection limit of ~ 1.15 µM. This work demonstrates a viable strategy for sustainable energy conversion, environmental remediation, and electrochemical sensing applications utilizing the intricate heterojunctions.

Graphical Abstract