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<p>WO<sub>3</sub> is a promising photoanode material for photoelectrochemical water splitting, offering unique advantages. However, it suffers from rapid recombination of photogenerated electro-hole pairs, sluggish kinetics of holes and slow transfer of photogenerated holes to electrolyte. In this study, a series of WO₃/ZnO nanocomposite photoanodes were fabricated via a simple solution chemical method. Photoelectrochemical tests revealed that the optimized WO₃/ZnO nanocomposite photoanode achieved a high photocurrent density of 1.2&#xa0;mA&#xa0;cm⁻<sup>2</sup> at 1.0&#xa0;V vs. Ag/AgCl, approximately six times higher than that of pure WO₃ nanosheets photoanode. This significant improvement can be attributed to the formation of heterojunction interfaces, which enhance the separation and transfer efficiency of photogenerated carriers while suppressing the recombination of electron–hole pairs. Moreover, the WO₃/ZnO nanocomposite photoanode offers a significant number of accessible active sites for effective interaction with the electrolyte.</p> Graphical Abstract <p>Schematic illustration of the PEC water splitting process using the WO₃-ZnO nanocomposite photoanode</p> <p></p>

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Enhancing photoelectrochemical performance of WO3 nanosheets modified by ZnO nanoparticles

  • 期刊论文

  • 发表日期：

    2026年1月9日

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  • Gaoxiang Fan,
  • Li Qin,
  • Xiaoliang Yuan,
  • Jiling Li,
  • Yuhua Yang

摘要

WO3 is a promising photoanode material for photoelectrochemical water splitting, offering unique advantages. However, it suffers from rapid recombination of photogenerated electro-hole pairs, sluggish kinetics of holes and slow transfer of photogenerated holes to electrolyte. In this study, a series of WO₃/ZnO nanocomposite photoanodes were fabricated via a simple solution chemical method. Photoelectrochemical tests revealed that the optimized WO₃/ZnO nanocomposite photoanode achieved a high photocurrent density of 1.2 mA cm⁻2 at 1.0 V vs. Ag/AgCl, approximately six times higher than that of pure WO₃ nanosheets photoanode. This significant improvement can be attributed to the formation of heterojunction interfaces, which enhance the separation and transfer efficiency of photogenerated carriers while suppressing the recombination of electron–hole pairs. Moreover, the WO₃/ZnO nanocomposite photoanode offers a significant number of accessible active sites for effective interaction with the electrolyte.

Graphical Abstract

Schematic illustration of the PEC water splitting process using the WO₃-ZnO nanocomposite photoanode