Piezoelectric built-in electric field advancing TiO2 for highly efficient photocatalytic air purification

Photocatalytic air purification is a promising technology; however, it suffers from a limited rate of photocatalytic mineralization (easily inactivated surfactant sites of hydroxyls) and poor kinetics of degradation. Herein, we report a ferroelectric strategy, employing a polyvinylidene fluoride (PV...

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Published inRSC advances Vol. 12; no. 35; pp. 22410 - 22415
Main Authors Li, Mengmeng, Cheng, Qin, Shen, Cheng, Hong, Bin, Jiang, Yong, Yuxue Wei, Cai, Mengdie, Chen, Jingshuai, Sun, Song
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 10.08.2022
The Royal Society of Chemistry
Subjects
Adsorption
Air purification
Chemistry
Current carriers
Electric fields
Electron clouds
Ferroelectric materials
Ferroelectricity
Formaldehyde
Hydroxyl groups
Hydroxyl radicals
Mineralization
Photocatalysis
Piezoelectricity
Polarization
Polyvinylidene fluorides
Titanium dioxide
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Summary:Photocatalytic air purification is a promising technology; however, it suffers from a limited rate of photocatalytic mineralization (easily inactivated surfactant sites of hydroxyls) and poor kinetics of degradation. Herein, we report a ferroelectric strategy, employing a polyvinylidene fluoride (PVDF) layer embedded with TiO2, where the polarization field of stretched PVDF dramatically enhances and stabilizes active adsorption sites for the promotion of charge separation. The F (−) and H (+) atomic layers with distinct local structures in stretched PVDF increase the electron cloud density around Ti which simultaneously promotes the dissociation of water to form hydroxyl groups which are easier to activate for adsorption of formaldehyde molecules. Besides, the ferroelectric field of stretched PVDF effectively separates the photogenerated charge carriers and facilitates the carriers' transportation of TiO2/PVDF. The optimal stretched TiO2/PVDF exhibits excellent photocatalytic mineralization for formaldehyde with considerable stability. This work may evolve the polarization field as a new method to enhance adsorption and activation of hydroxyls and disclose the mechanism by which hydroxyl radicals mineralize gaseous formaldehyde for photocatalytic air purification.
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These authors contributed equally to this work.
ISSN:2046-2069
2046-2069
DOI:10.1039/d2ra03751c