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<p>Piezo-photocatalysis can effectively combines photocatalysis and piezoelectric polarization to improve the carrier separation efficiency overall performance. Here, Cu<sub>2</sub>O/BaTiO<sub>3</sub> p–n heterojunction composite has been successfully synthesized by facile wet chemical method in this work. The synergistic piezo-photocatalytic effect of Cu<sub>2</sub>O/BaTiO<sub>3</sub> was investigated for the degradation of dye acid orange 7 (AO7)&#xa0;under simulated solar light illumination and ultrasonic vibration. A significant improvement in dye degradation efficiency was observed, with a remarkable 98.5% degradation achieved within 60&#xa0;min of piezo-photocatalysis treatment, surpassing the degradation rates observed for individual photocatalysis (53.2%) and piezocatalysis (40.8%). This enhancement can be attributed to the higher spatial separation of photogenerated carriers, facilitated by the heterojunction interface electric field of Cu<sub>2</sub>O/BTiO<sub>3</sub> and build-in electric field of BaTiO<sub>3</sub>. This unique spatial separation mechanism results in an increased generation of reactive species, ultimately contributing to enhanced degradation of AO7 molecules. This study presents a feasible approach for the synthesis of the Cu<sub>2</sub>O/BTiO<sub>3</sub> p–n junction and effectively transcending the limitations inherent to individual Cu<sub>2</sub>O or BaTiO<sub>3</sub> in terms of catalytic efficacy.</p> Graphical abstract <p></p>

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Enhanced piezo-photocatalytic performance of Cu2O/BaTiO3 p–n heterojunction for efficient dye degradation

  • 期刊论文

  • 发表日期：

    2025年2月19日

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  • Lei Xiao,
  • Fan Tian,
  • Pengfei Lu,
  • Fan Zhang,
  • Yanchao Zhang,
  • Quankun Zhang,
  • Zhenglong Hu,
  • Juan Xiong

摘要

Piezo-photocatalysis can effectively combines photocatalysis and piezoelectric polarization to improve the carrier separation efficiency overall performance. Here, Cu2O/BaTiO3 p–n heterojunction composite has been successfully synthesized by facile wet chemical method in this work. The synergistic piezo-photocatalytic effect of Cu2O/BaTiO3 was investigated for the degradation of dye acid orange 7 (AO7) under simulated solar light illumination and ultrasonic vibration. A significant improvement in dye degradation efficiency was observed, with a remarkable 98.5% degradation achieved within 60 min of piezo-photocatalysis treatment, surpassing the degradation rates observed for individual photocatalysis (53.2%) and piezocatalysis (40.8%). This enhancement can be attributed to the higher spatial separation of photogenerated carriers, facilitated by the heterojunction interface electric field of Cu2O/BTiO3 and build-in electric field of BaTiO3. This unique spatial separation mechanism results in an increased generation of reactive species, ultimately contributing to enhanced degradation of AO7 molecules. This study presents a feasible approach for the synthesis of the Cu2O/BTiO3 p–n junction and effectively transcending the limitations inherent to individual Cu2O or BaTiO3 in terms of catalytic efficacy.

Graphical abstract