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<p>The present study investigates the integration of charge density wave material TiSe<sub>2</sub> pyramids grown on Ti metal foil with wide bandgap ZnSe film for sunlight-driven water-splitting. X-ray diffraction and X-ray photoelectron spectroscopy analysis verified the excellent crystallinity and successful fabrication of the ZnSe/TiSe<sub>2</sub> pyramids heterostructure. The photoelectrochemical measurements were performed in 0.5&#xa0;M Na<sub>2</sub>SO<sub>4</sub> electrolyte under <i>AM</i> = 1.5 G solar condition, demonstrating ZnSe/TiSe<sub>2</sub> exhibited photocurrent density of 175.2 µA/cm<sup>2</sup> at 0.8&#xa0;V vs Ag/AgCl. The enhanced photocurrent density is attributed to the excellent electrical conductivity between ZnSe and TiSe<sub>2</sub>, increased catalytic sites, and rapid charge carrier separation and migration due to favorable band alignment between ZnSe and TiSe<sub>2</sub>. These results underscore the potential of TiSe<sub>2</sub>-based heterostructure in optimizing solar-to-hydrogen conversion and offer insights into band engineering for improving PEC performance.</p>

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Growth of ZnSe/TiSe2 layered pyramidal heterostructures for photoelectrochemical water-splitting

  • 期刊论文

  • 发表日期：

    2025年9月10日

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  • Bheem Singh,
  • Rahul Kumar,
  • Govinda Chandra Behera,
  • Priya Pandey,
  • M. Senthil Kumar,
  • Ramakrishnan Ganesan,
  • Somnath C. Roy,
  • Sunil Singh Kushvaha

摘要

The present study investigates the integration of charge density wave material TiSe2 pyramids grown on Ti metal foil with wide bandgap ZnSe film for sunlight-driven water-splitting. X-ray diffraction and X-ray photoelectron spectroscopy analysis verified the excellent crystallinity and successful fabrication of the ZnSe/TiSe2 pyramids heterostructure. The photoelectrochemical measurements were performed in 0.5 M Na2SO4 electrolyte under AM = 1.5 G solar condition, demonstrating ZnSe/TiSe2 exhibited photocurrent density of 175.2 µA/cm2 at 0.8 V vs Ag/AgCl. The enhanced photocurrent density is attributed to the excellent electrical conductivity between ZnSe and TiSe2, increased catalytic sites, and rapid charge carrier separation and migration due to favorable band alignment between ZnSe and TiSe2. These results underscore the potential of TiSe2-based heterostructure in optimizing solar-to-hydrogen conversion and offer insights into band engineering for improving PEC performance.