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Introducing polarization field of piezoelectric materials is an effective strategy to improve photocatalytic performance. In this study, a new type of BaTiO3/CuO heterostructure catalyst was designed and synthesized to achieve high piezo-photocatalytic activity through the synergy of heterojunction and piezoelectric effect. The BaTiO3/CuO heterostructure shows a significantly enhanced piezo-photocatalytic degradation efficiency of organic pollutants compared with the individual BaTiO3 nanowires (NWs) and CuO nanoparticles (NPs). Under the co-excitation of ultrasonic vibration and ultraviolet radiation, the optimal degradation reaction rate constant k of polarized BaTiO3/CuO heterostructure on methyl orange (MO) dye can reach 0.05 min-1, which is 6.1 times of photocatalytic rate and 7 times of piezocatalytic rate. The BaTiO3/CuO heterostructure with remarkable piezo-photocatalytic behavior provides a promising strategy for the development of high-efficiency catalysts for wastewater purification, and it also helps understand the coupling mechanism between piezoelectric effect and photocatalysis.


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Remarkably enhanced piezo-photocatalytic performance in BaTiO3/CuO heterostructures for organic pollutant degradation

Show Author's information Chengye YUa,bMengxi TANa,bChengdong TAOa,bYuxuan HOUa,bChuanbao LIUcHuimin MENGbYanjing SUa,bLijie QIAOa,bYang BAIa,b( )
Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China
Institute for Advanced Material and Technology, University of Science and Technology Beijing, Beijing 100083, China
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

Abstract

Introducing polarization field of piezoelectric materials is an effective strategy to improve photocatalytic performance. In this study, a new type of BaTiO3/CuO heterostructure catalyst was designed and synthesized to achieve high piezo-photocatalytic activity through the synergy of heterojunction and piezoelectric effect. The BaTiO3/CuO heterostructure shows a significantly enhanced piezo-photocatalytic degradation efficiency of organic pollutants compared with the individual BaTiO3 nanowires (NWs) and CuO nanoparticles (NPs). Under the co-excitation of ultrasonic vibration and ultraviolet radiation, the optimal degradation reaction rate constant k of polarized BaTiO3/CuO heterostructure on methyl orange (MO) dye can reach 0.05 min-1, which is 6.1 times of photocatalytic rate and 7 times of piezocatalytic rate. The BaTiO3/CuO heterostructure with remarkable piezo-photocatalytic behavior provides a promising strategy for the development of high-efficiency catalysts for wastewater purification, and it also helps understand the coupling mechanism between piezoelectric effect and photocatalysis.

Keywords:

piezotronics, photocatalysis, polarization, heterostructure
Received: 20 August 2021 Revised: 01 October 2021 Accepted: 04 October 2021 Published: 11 February 2022 Issue date: March 2022
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Publication history

Received: 20 August 2021
Revised: 01 October 2021
Accepted: 04 October 2021
Published: 11 February 2022
Issue date: March 2022

Copyright

© The Author(s) 2021.

Acknowledgements

This work was supported by the Major Science and Technology Programs of Yunnan (No. 202002AB080001-1), National Natural Science Foundation of China (No. 91963114), Fundamental Research Funds for the Central Universities (No. FRF-TP-20-12B), and National Key R&D Program of China (No. 2018YFB0704301).

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