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<p>The rapid recombination of photogenerated electron-hole pairs in ZnIn<sub>2</sub>S<sub>4</sub> (ZIS) significantly limits its photocatalytic efficiency for hydrogen evolution. To overcome this challenge, we engineered a ternary Cu<sub>3</sub>P/ITO/ZnIn<sub>2</sub>S<sub>4</sub> composite, where indium tin oxide (ITO) serves as a conductive mediator to enhance charge transfer. Synthesized via a hydrothermal-calcination method, the composite features a hierarchical flower-like structure with optimized interfacial contact. Under simulated sunlight (AM 1.5G), the catalyst achieves a photocurrent density of 4.21 μA·cm<sup>-2</sup>—2.02 times higher than pristine ZIS—and a hydrogen evolution rate of 5.4528 mmol·g<sup>-1</sup>·h<sup>-1</sup>, surpassing most reported ZIS-based systems. Mechanistic studies reveal that ITO facilitates efficient electron transport between ZIS and Cu<sub>3</sub>P, forming an indirect Z-scheme heterojunction that suppresses charge recombination while extending light absorption. This work demonstrates the critical role of interfacial engineering in designing high-performance photocatalysts for solar hydrogen production.</p>

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Cu3P/ITO/ZnIn2S4Flower-like composite for efficient photocatalytic hydrogen evolution reaction

  • 期刊论文

  • 发表日期：

    2025年4月28日

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  • Jia Du,
  • Bin Li,
  • Liang Wu,
  • Hongzhuang Yang,
  • Pengcheng Wu,
  • Keliang Wu

摘要

The rapid recombination of photogenerated electron-hole pairs in ZnIn2S4 (ZIS) significantly limits its photocatalytic efficiency for hydrogen evolution. To overcome this challenge, we engineered a ternary Cu3P/ITO/ZnIn2S4 composite, where indium tin oxide (ITO) serves as a conductive mediator to enhance charge transfer. Synthesized via a hydrothermal-calcination method, the composite features a hierarchical flower-like structure with optimized interfacial contact. Under simulated sunlight (AM 1.5G), the catalyst achieves a photocurrent density of 4.21 μA·cm-2—2.02 times higher than pristine ZIS—and a hydrogen evolution rate of 5.4528 mmol·g-1·h-1, surpassing most reported ZIS-based systems. Mechanistic studies reveal that ITO facilitates efficient electron transport between ZIS and Cu3P, forming an indirect Z-scheme heterojunction that suppresses charge recombination while extending light absorption. This work demonstrates the critical role of interfacial engineering in designing high-performance photocatalysts for solar hydrogen production.