Journal
NANO LETTERS
Volume 15, Issue 4, Pages 2372-2379Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl504630j
Keywords
built-in electric field; ultrasonic wave; sonophotocatalysis; piezophototronics
Categories
Funding
- National Natural Science Foundation of China [51372142, 31430031, U1332118]
- NSFC Innovation Research Group [IRG: 51321091]
- 100 Talents Program of the Chinese Academy of Sciences
- Thousands Talents program
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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.
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