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Nonstoichiometric tungsten oxide residing in a 3D nitrogen doped carbon matrix, a composite photocatalyst for oxygen vacancy induced VOC degradation and H2 production

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Abstract

With a coordination complex modified polyoxometalate compound and filter paper as precursors, an oxygen vacancy rich composite photocatalyst (WO3−x/NC) composed of nonstoichiometric tungsten oxide (WO3−x, 1 > x > 0) and a 3D nitrogen doped carbon matrix was synthesized successfully. In WO3−x/NC, WO3−x nanoparticles with a size of about 3 to 6 nm are dispersed homogenously in a 3D nitrogen doped carbon matrix. The existence of oxygen vacancies has been confirmed by electron spin resonance (ESR) and X-ray photoelectron spectroscopy (XPS). WO3−x/NC exhibits remarkable photocatalytic activity for the degradation of volatile organic compounds (VOCs). Under visible light irradiation it can completely degrade formaldehyde and benzene in 90 min. The durability of WO3−x/NC is also excellent. After 8 successive reaction cycles the removal rate stays as high as 92%. More importantly, WO3−x/NC also exhibits outstanding visible and near-infrared light driven photocatalytic H2 evolution activity. The prominent VOC removal and H2 production properties can be attributed to the oxygen vacancies from WO3−x and the good conductivity of the nitrogen doped carbon matrix. We hope WO3−x/NC can be applied as an effective material in air purification and H2 energy development.

Graphical abstract: Nonstoichiometric tungsten oxide residing in a 3D nitrogen doped carbon matrix, a composite photocatalyst for oxygen vacancy induced VOC degradation and H2 production

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Publication details

The article was received on 20 Dec 2017, accepted on 30 Jan 2018 and first published on 31 Jan 2018


Article type: Paper
DOI: 10.1039/C7CY02572F
Citation: Catal. Sci. Technol., 2018, Advance Article
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    Nonstoichiometric tungsten oxide residing in a 3D nitrogen doped carbon matrix, a composite photocatalyst for oxygen vacancy induced VOC degradation and H2 production

    L. Wang, X. Xu, S. Wu and F. Cao, Catal. Sci. Technol., 2018, Advance Article , DOI: 10.1039/C7CY02572F

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