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<p>The recombination of photogenerated electron–hole pairs is a main factor limiting photocatalytic performance. Combining piezoelectric effect with photocatalysis is an effective strategies to improve photocatalytic performance. In our work, WO<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub> heterojunction was synthesized via an ultrasonic mixing method. The degradation efficiency of Rhodamine B (RhB) by the optimized WO<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub> composite catalyst reached 95.7% within 30&#xa0;min under simultaneous ultrasonication and visible light irradiation. Furthermore, quenching experiments and electron paramagnetic resonance (EPR) spectroscopy confirmed the Z-scheme mechanism for WO<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub> heterojunction. The piezoelectric effect of g-C<sub>3</sub>N<sub>4</sub> nanosheets speeds up recombination of photogenerated electrons in the WO<sub>3</sub> conduction band and holes in the g-C<sub>3</sub>N<sub>4</sub> valence band. Meanwhile, electrons in the g-C<sub>3</sub>N<sub>4</sub> conduction band and holes in the WO<sub>3</sub> valence band are separated due to the repulsion from the built-in electric field. In addition, the accumulation of electrons and holes near the composite surface caused the g-C<sub>3</sub>N<sub>4</sub> conduction band and valence band to bend. Ultimately, high electron–hole separation efficiency and band bending enhanced the photocatalytic performance of heterojunction.</p>

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Piezoelectric polarization enhanced photocatalytic performance of WO3/g-C3N4 Z-scheme heterojunction

  • 期刊论文

  • 发表日期：

    2025年8月12日

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  • Xin Yan,
  • Na Wang,
  • Hao Wang,
  • Xiang Zhong,
  • Yanhui Niu

摘要

The recombination of photogenerated electron–hole pairs is a main factor limiting photocatalytic performance. Combining piezoelectric effect with photocatalysis is an effective strategies to improve photocatalytic performance. In our work, WO3/g-C3N4 heterojunction was synthesized via an ultrasonic mixing method. The degradation efficiency of Rhodamine B (RhB) by the optimized WO3/g-C3N4 composite catalyst reached 95.7% within 30 min under simultaneous ultrasonication and visible light irradiation. Furthermore, quenching experiments and electron paramagnetic resonance (EPR) spectroscopy confirmed the Z-scheme mechanism for WO3/g-C3N4 heterojunction. The piezoelectric effect of g-C3N4 nanosheets speeds up recombination of photogenerated electrons in the WO3 conduction band and holes in the g-C3N4 valence band. Meanwhile, electrons in the g-C3N4 conduction band and holes in the WO3 valence band are separated due to the repulsion from the built-in electric field. In addition, the accumulation of electrons and holes near the composite surface caused the g-C3N4 conduction band and valence band to bend. Ultimately, high electron–hole separation efficiency and band bending enhanced the photocatalytic performance of heterojunction.