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Title: Effects of cation concentration on photocatalytic performance over magnesium vanadates

A series of magnesium vanadates (MgV {sub 2}O{sub 6}, Mg{sub 2}V {sub 2}O{sub 7}, and Mg{sub 3}V {sub 2}O{sub 8}) were synthesized to investigate the effect of cation concentration on photocatalytic performance. The samples were characterized by X-ray diffraction, field emission-scanning electron microscopy, UV-visible diffuse reflectance spectroscopy, and fluorescence spectroscopy. The photocatalytic O{sub 2} evolution experiments under visible light irradiation showed Mg{sub 2}V {sub 2}O{sub 7} exhibits the best performance, while Mg{sub 3}V {sub 2}O{sub 8} has the lowest activity. The density functional theory calculations indicated that the lowest unoccupied states of Mg{sub 3}V {sub 2}O{sub 8} are the mostly localized by the cation layers. The fluorescence spectra and fluorescence decay curves gave evident performances of excited states of magnesium vanadates and pointed out MgV {sub 2}O{sub 6} has a very short excited electron lift-time. Mg{sub 2}V {sub 2}O{sub 7} performs high photocatalytic activity because of its high electron mobility and long electron life-time.
Authors:
 [1] ;  [2] ; ; ;  [3] ; ;  [1] ;  [4] ;  [5] ;  [1] ;  [4] ;  [6]
  1. Catalytic Materials Group, Environmental Remediation Materials Unit, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)
  2. Department of Physics, Tianjin University, 92 Weijin Road, Nankai District, Tianjin (China)
  3. TU-NIMS Joint Research Center, School of Materials Science and Engineering, Tianjin University, 92 Weijin Road, Nankai District, Tianjin (China)
  4. (China)
  5. (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012 (Japan)
  6. (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)
Publication Date:
OSTI Identifier:
22499263
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL Materials; Journal Volume: 3; Journal Issue: 10; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CATIONS; CONCENTRATION RATIO; DENSITY FUNCTIONAL METHOD; ELECTRON MOBILITY; ELECTRONS; EXCITED STATES; FIELD EMISSION; FLUORESCENCE; FLUORESCENCE SPECTROSCOPY; IRRADIATION; MAGNESIUM; PHOTOCATALYSIS; SCANNING ELECTRON MICROSCOPY; VANADATES; X-RAY DIFFRACTION