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<p>A new Zn₃(PO₄)₂/Au/g-C₃N₄-based ternary catalyst was synthesized through a simple aqueous-phase method and employed for hydrogen evolution under visible light exposure (<i>λ</i> &gt; 400&#xa0;nm). The material’s microstructure, phase identity, light-response features, and elemental distribution were systematically studied using SEM imaging, XRD patterns, PL emission, and XPS spectra. Among the samples, the Zn₃(PO₄)₂/Au/g-C₃N₄ composite demonstrated the most efficient hydrogen production, reaching 1235 μmolh⁻<sup>1</sup>&#xa0;g⁻<sup>1</sup>, which represents a 4.5-fold and 7.5-fold enhancement compared to Zn₃(PO₄)₂ (175&#xa0;μmol&#xa0;h⁻<sup>1</sup> g⁻<sup>1</sup>) and g-C₃N₄ (164&#xa0;μmolh⁻<sup>1</sup>&#xa0;g⁻<sup>1</sup>), respectively. Simulations using finite element analysis in the frequency domain confirmed that the pronounced improvement in catalytic performance is primarily due to the surface plasmon resonance (SPR) effect of gold, which facilitates more efficient separation and movement of photogenerated carriers—an essential factor for optimizing solar-to-hydrogen conversion. Additionally, time-resolved photocurrent measurements and electrochemical impedance spectroscopy (EIS) were conducted to evaluate the dynamic charge behavior and resistance properties of the photocatalyst.</p>

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Enhanced photocatalytic H2 evolution on g-C3N4 nanosheets loaded Au/Zn3(PO4)2 as cocatalysts

  • 期刊论文

  • 发表日期：

    2025年8月12日

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  • P. Senthil,
  • A. Sankar,
  • K. Paramasivaganesh,
  • S. P. Saravanan

摘要

A new Zn₃(PO₄)₂/Au/g-C₃N₄-based ternary catalyst was synthesized through a simple aqueous-phase method and employed for hydrogen evolution under visible light exposure (λ > 400 nm). The material’s microstructure, phase identity, light-response features, and elemental distribution were systematically studied using SEM imaging, XRD patterns, PL emission, and XPS spectra. Among the samples, the Zn₃(PO₄)₂/Au/g-C₃N₄ composite demonstrated the most efficient hydrogen production, reaching 1235 μmolh⁻1 g⁻1, which represents a 4.5-fold and 7.5-fold enhancement compared to Zn₃(PO₄)₂ (175 μmol h⁻1 g⁻1) and g-C₃N₄ (164 μmolh⁻1 g⁻1), respectively. Simulations using finite element analysis in the frequency domain confirmed that the pronounced improvement in catalytic performance is primarily due to the surface plasmon resonance (SPR) effect of gold, which facilitates more efficient separation and movement of photogenerated carriers—an essential factor for optimizing solar-to-hydrogen conversion. Additionally, time-resolved photocurrent measurements and electrochemical impedance spectroscopy (EIS) were conducted to evaluate the dynamic charge behavior and resistance properties of the photocatalyst.