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Title: Enhanced photoelectrochemical properties of TiO{sub 2} by codoping with tungsten and silver

The Tungsten (W) and Silver (Ag) codoped TiO{sub 2} samples were successfully synthesized by hydrothermal method without any post calcination. To understand the correlation between electronic structure and photocatalytic properties, the synthesized samples were characterized using X-ray diffraction, Brunauer–Emmett–Teller specific surface area, transmission electron microscopy, ultra-violet–visible absorption spectra, and X-ray photoelectron spectroscopy (XPS), and the photocatalytic properties were evaluated under visible light irradiations. Codoping could not induce any changes in the phase and all the synthesized samples displayed pure anatase phase with spherical morphology. Visible light absorptions of the codoped samples were dramatically improved compared to the corresponding mono-doped samples. XPS analysis indicated that the dopant atoms successfully entered the TiO{sub 2} network. Results from the visible light photodegradation experiments showed that tungsten-silver codoped TiO{sub 2} possessed strong ability in photo-degrading methylene blue compared to tungsten doped TiO{sub 2} and silver doped TiO{sub 2}, which was attributed to the smaller particle size, higher specific surface area, enhanced visible light absorption, and improved separation of photogenerated carriers.
Authors:
 [1] ;  [2] ; ;  [1] ;  [3]
  1. Department of Inorganic Nonmetallic Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 (China)
  2. (KUST), Kohat 26000 (Pakistan)
  3. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083 (China)
Publication Date:
OSTI Identifier:
22273563
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 15; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTRA; CALCINATION; CHARGE CARRIERS; COMPARATIVE EVALUATIONS; DOPED MATERIALS; ELECTRONIC STRUCTURE; HYDROTHERMAL SYNTHESIS; METHYLENE BLUE; PARTICLE SIZE; SILVER; SPECIFIC SURFACE AREA; TITANIUM OXIDES; TRANSMISSION ELECTRON MICROSCOPY; TUNGSTEN; VISIBLE RADIATION; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY