Synthesis of cuboid-type tungsten trioxide photocatalysts for oxygen evolution from water in the presence of silver(I) sulfate under visible light irradiation
- Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University, 1-1-1 Noji-higashi, Kusatsu, Shiga 525-8577 (Japan)
- Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University, Kowakae, Higashiosaka, Osaka 577-8502 (Japan)
Highlights: • Visible-light photocatalytic cuboid-type tungsten trioxide (C-WO{sub 3}) particles were prepared by calcination at various temperatures between 200 and 500 °C. • Photocatalysis of the prepared C-WO{sub 3} samples was investigated for oxygen evolution from water in the presence of sacrificial silver(I) sulfate. • The photocatalytic activity differed among the samples and the sample calcined at 400 °C showed the top activity. • The main factor influencing the photocatalytic activity of the C-WO{sub 3} was determined. - Abstract: We synthesized various cuboid-type tungsten trioxide (WO{sub 3}) particles using a hydrothermal method followed by calcination at various temperatures between 200 and 500 °C. Visible-light photocatalysis of these particles was investigated for oxygen (O{sub 2}) evolution from water in the presence of sacrificial silver(I) sulfate. The calculated crystallite diameters increased with increasing calcination temperature, suggesting that the level of crystallinity increased with calcination temperature. The average specific surface area of the particles was almost the same for all calcination temperatures in the range 200–400 °C, but was decreased at 500 °C. The photocatalytic reaction rate of O{sub 2} formation increased with increasing calcination temperature up to 400 °C, and then decreased as calcination temperature was further increased to 500 °C. We therefore concluded that the rate increased with calcination temperature up to 400 °C due to the increasing crystallinity, but then decreased due to the decreased specific surface area.
- OSTI ID:
- 22804002
- Journal Information:
- Materials Research Bulletin, Vol. 102; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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