Enhanced Ferroelectric-Nanocrystal-Based Hybrid Photocatalysis by Ultrasonic-Wave-Generated Piezophototronic Effect

Haidong Li, Yuanhua Sang, Sujie Chang, Xin Huang, Yan Zhang, Rusen Yang, Huaidong Jiang, Hong Liu, Zhong Lin Wang

Research output: Contribution to journalArticlepeer-review

340 Scopus citations


An electric field built inside a crystal was proposed to enhance photoinduced carrier separation for improving photocatalytic property of semiconductor photocatalysts. However, a static built-in electric field can easily be saturated by the free carriers due to electrostatic screening, and the enhancement of photocatalysis, thus, is halted. To overcome this problem, here, we propose sonophotocatalysis based on a new hybrid photocatalyst, which combines ferroelectric nanocrystals (BaTiO3) and semiconductor nanoparticles (Ag2O) to form an Ag2O-BaTiO3 hybrid photocatalyst. Under periodic ultrasonic excitation, a spontaneous polarization potential of BaTiO3 nanocrystals in responding to ultrasonic wave can act as alternating built-in electric field to separate photoinduced carriers incessantly, which can significantly enhance the photocatalytic activity and cyclic performance of the Ag2O-BaTiO3 hybrid structure. The piezoelectric effect combined with photoelectric conversion realizes an ultrasonic-wave-driven piezophototronic process in the hybrid photocatalyst, which is the fundamental of sonophotocatalysis. (Figure Presented).

Original languageEnglish (US)
Pages (from-to)2372-2379
Number of pages8
JournalNano letters
Issue number4
StatePublished - Apr 8 2015

Bibliographical note

Publisher Copyright:
© 2015 American Chemical Society.


  • built-in electric field
  • piezophototronics
  • sonophotocatalysis
  • ultrasonic wave


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