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Ethanol-Quenching Introduced Oxygen Vacancies in Strontium Titanate Surface and the Enhanced Photocatalytic Activity

1
School of Physics & Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China
2
Synergy Innovation Institute for Modern Industries, Guangdong University of Technology, Dongyuan 517500, China
3
School of Physics Science and Technology, Lingnan Normal University, Zhanjiang 524048, China
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(6), 883; https://doi.org/10.3390/nano9060883
Received: 23 May 2019 / Revised: 8 June 2019 / Accepted: 10 June 2019 / Published: 14 June 2019
Modification of the surface properties of SrTiO3 crystals by regulating the reaction environment in order to improve the photocatalytic activity has been widely studied. However, the development of a facile, effective, and universal method to improve the photocatalytic activity of these crystals remains an enormous challenge. We have developed a simple method to modify the surface environment of SrTiO3 by ethanol quenching, which results in enhanced UV, visible and infrared light absorption and photocatalytic performance. The SrTiO3 nanocrystals were preheated to 800 °C and immediately quenched by submersion in ethanol. X-ray diffraction patterns, electron paramagnetic resonance spectra, and X-ray photoelectron spectra indicated that upon rapid ethanol quenching, the interaction between hot SrTiO3 and ethanol led to the introduction of a high concentration of oxygen vacancies on the surface of the SrTiO3 lattice. Consequently, to maintain the regional charge balance of SrTiO3, Sr2+ could be substituted for Ti4+. Moreover, oxygen vacancies induced localized states into the band gap of the modified SrTiO3 and acted as photoinduced charge traps, thus promoting the photocatalytic activity. The improved photocatalytic performance of the modified SrTiO3 was demonstrated by using it for the decomposition of rhodamine B and production of H2 from water under visible or solar light. View Full-Text
Keywords: photocatslysis; SrTiO3; ethanol-quenching; oxygen vacancies; photodegradation; photocatlytic H2 generation photocatslysis; SrTiO3; ethanol-quenching; oxygen vacancies; photodegradation; photocatlytic H2 generation
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MDPI and ACS Style

Xiao, Y.; Chen, S.; Wang, Y.; Hu, Z.; Zhao, H.; Xie, W. Ethanol-Quenching Introduced Oxygen Vacancies in Strontium Titanate Surface and the Enhanced Photocatalytic Activity. Nanomaterials 2019, 9, 883.

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