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Oxygen vacancies confined in SnO2 nanoparticles for glorious photocatalytic activities from UV, visible to near-infrared region

Abstract

For the purpose of effectively utilizing solar energy, tailoring of energy band configuration represents an effective approach to the exploration and development of full-spectrum-responsive photocatalysts with advanced performance. In this work, we developed SnO2 nanoparticles with adjusted energy band configuration by introducing oxygen vacancies (OV-SnO2) via a one-step hydrothermal process. The existence of oxygen vacancies was confirmed by XPS, ESR and PL. VB-XPS and the UV-Vis-NIR absorption spectrum reveal that the introduction of oxygen vacancies increased valence band width, resulting in the narrowed bandgap and increased photoabsorption. The obtained OV-SnO2 with a desirable energy band configuration exhibits superior full-spectrum-response of photocatalytic activity under either UV, visible or even near-infrared light irradiation for photodegradation of methyl orange (MO), which is completely accomplished within only 60 min on the condition of near-infrared light irradiation even more strikingly. The photocatalytic mechanism of full-spectrum-responsive photoreactivity, attributed to a narrowed bandgap and the broaden valence band width, was also revealed. The narrowed bandgap further contributes to extended light absorption range and the broaden valence band width leads to efficient charge transfer and separation, hence revealing an outstanding full-spectrum-responsive photoreactivity. This research could shed light on general doping strategies for designing efficient photocatalysts and facilitate their application in environmental protection.

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Publication details

The article was received on 07 Feb 2018, accepted on 22 Jul 2018 and first published on 23 Jul 2018


Article type: Paper
DOI: 10.1039/C8NJ00668G
Citation: New J. Chem., 2018, Accepted Manuscript
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    Oxygen vacancies confined in SnO2 nanoparticles for glorious photocatalytic activities from UV, visible to near-infrared region

    L. Yang, Y. yang, T. Liu, X. Ma, S. W. Lee and Y. Wang, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ00668G

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