NDLI: Synthesis of WO<sub>3</sub>@Graphene composite for enhanced photocatalytic oxygen evolution from water

Content Provider	Royal Society of Chemistry (RSC)
Author	Guo, Jingjing Li, Yao Liu, Qinglei Chen, Zhixin Song, Deok-Min Zhu, Shenmin Zhang, Di Moon, Won-Jin
Copyright Year	2012
Abstract	Nano tungsten oxide (WO3) particles were synthesized on the surface of graphene (GR) sheets by using a simple sonochemical method. The obtained composite, WO3@GR, was characterized by X-ray diffraction, N2adsorption/desorption analysis, thermo-gravimetric analysis, Raman spectroscopy and UV-vis diffuse reflectance spectra measurements. It was found that chemical bonds between the nano WO3 particles and the GR sheets were formed. The average particle size of the WO3 was evidenced to be around 12 nm on the GR sheets. When used as photocatalyst for water splitting, the amount of evolved O2 from water for the WO3@GR composite with 40 wt% GR inside was twice and 1.8 times as much as that for pure WO3 and mixed-WO3/GR, respectively. The excellent photocatalytic property of the WO3@GR composite is due to the synergistic effects of the combined nano WO3 particles and GR sheets. The sensitization of WO3 by GR enhances the visible light absorption property of WO3@GR. The chemical bonding between WO3 and GR minimizes the interface defects, reducing the recombination of the photo-generated electron–hole pairs. Furthermore, the GR sheets in the WO3@GR composite enhance electrons transport by providing low resistance conduction pathways, leading to improved photo-conversion efficiency. The methodology opens up a new way of obtaining photoactive GR-semiconductor composites for photodissociating water under visible light.
Starting Page	1356
Ending Page	1363
Page Count	8
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	2
Issue Number	4
Journal	RSC Advances
DOI	10.1039/c1ra00621e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	X-ray crystallography Tungsten oxide Water splitting Oxygen Graphene Photocatalysis Carrier generation and recombination Raman Raman spectroscopy
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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