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<p>A PVDF-HFP-based composite porous membrane was successfully fabricated with the strategic incorporation of ZnO rods preferentially aligned along the c-axis. This unique structure ensures the uniform dispersion and adequate exposure of ZnO nanorods within the PVDF-HFP matrix while maintaining the interconnectivity of the porous membrane, which effectively increases active interfaces and strain transfer efficiency. Under coupled light and ultrasound irradiation, the PHZ-0.15 composite membrane demonstrated optimal performance, achieving an H<sub>2</sub>O<sub>2</sub> production rate of 862 µmol·cm<sup>− 2</sup>·h<sup>− 1</sup>. The composite also exhibited excellent cycling stability. Trapping experiments revealed that the synergy between ultrasound-induced piezoelectric polarization and photogenerated carrier separation significantly promotes the two-electron reduction of O<sub>2</sub> via conduction band electrons, with electrons and superoxide radicals (·O<sub>2</sub><sup>−</sup>) identified as the primary active species. This study provides a new strategy and mechanistic insight for developing efficient piezo-photocatalytic materials toward sustainable H<sub>2</sub>O<sub>2</sub> production.</p> Graphical Abstract <p></p>

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C-Axis Oriented ZnO/PVDF-HFP Porous Membranes for Efficient Piezo-Photocatalytic H2O2 Production

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • Ning Zhang,
  • Yi Wang,
  • Ke Cui,
  • Xue Yang,
  • Dongping Tao,
  • Qian Zhang,
  • Huaizhi Shao

摘要

A PVDF-HFP-based composite porous membrane was successfully fabricated with the strategic incorporation of ZnO rods preferentially aligned along the c-axis. This unique structure ensures the uniform dispersion and adequate exposure of ZnO nanorods within the PVDF-HFP matrix while maintaining the interconnectivity of the porous membrane, which effectively increases active interfaces and strain transfer efficiency. Under coupled light and ultrasound irradiation, the PHZ-0.15 composite membrane demonstrated optimal performance, achieving an H2O2 production rate of 862 µmol·cm− 2·h− 1. The composite also exhibited excellent cycling stability. Trapping experiments revealed that the synergy between ultrasound-induced piezoelectric polarization and photogenerated carrier separation significantly promotes the two-electron reduction of O2 via conduction band electrons, with electrons and superoxide radicals (·O2−) identified as the primary active species. This study provides a new strategy and mechanistic insight for developing efficient piezo-photocatalytic materials toward sustainable H2O2 production.

Graphical Abstract