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Enhanced photocatalytic activity of ferroelectric-based Ag2O/Bi4Ti3O12 hybrids by piezoelectric effect by Hui Sun; Zirou Xu; Xi Xie; Jiaying Niu; Minggui Wang; Xiuyun Zhang; Xiaobing Chen; Jie Han is a Materials Science article available to read on EtoBox.

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Combining the ferroelectric/piezoelectric catalysts with photocatalysts was demonstrated as an effective way to facilitate the separation of photoinduced electrons and holes to superior synergistically catalytic activities. In this work, Bi 4 Ti 3 O 12 (BiTO) nanoflowers were synthesized with Ag 2 O nanoparticles uniformly decorated on the surfaces, forming xAg 2 O/BiTO (x = 0-30%) hybrids. The light absorption, photocatalytic activity, and cyclic stability of BiTO nanoflowers were tremendously enhanced after Ag 2 O decoration. Density functional theory (DFT) calculations have confirmed the large ferroelectric spontaneous polarization along [100] axis in BiTO, which acts as built-in electric field to boost electrons and holes transfer into opposite direction. However, the static built-in electric field can easily be screened by free carriers. To resolve this item, ultrasonic excitation was introduced. The periodic mechanical vibration added on ferroelectrics could maintain the built-in field effective continuously, further improving the photocatalytic activity. Moreover, the ultrasonic frequency and electric poling were found to have influence on the photocatalytic activity. The po

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Author

Hui Sun; Zirou Xu; Xi Xie; Jiaying Niu; Minggui Wang; Xiuyun Zhang; Xiaobing Chen; Jie Han

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Materials Science (Physical Sciences)