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International Journal of PhotoenergyVolume 2013 2013, Article ID 507194, 8 pages

Research Article

Laboratory for Solid State Chemistry and Catalysis, Empa—Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, CH-8600 Duebendorf, Switzerland

Laboratory of Photonics and Interfaces, Ecole Polytechnique Fédérale de Lausanne EPFL, Station 6, CH-1015 Lausanne, Switzerland

Received 28 November 2012; Accepted 31 January 2013

Academic Editor: Lukas Schmidt-Mende

Copyright © 2013 Songhak Yoon et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Phase-pure tantalum oxynitride β-TaON powders were synthesized by thermal ammonolysis of Ta2O5 powders. X-ray diffraction revealed an enlargement of the unit cell and an increase of the crystallite size with increasing ammonolysis temperature. Scanning electron microscopy showed reduced particle sizes for β-TaON synthesized at 800 and compared to the precursor oxide. With increasing nitridation temperature the Brunauer-Emmett-Teller surface area was reduced and the nitrogen content increased. UV-Vis spectroscopy showed a bandgap energy of 2.6–2.4 eV. The highest oxygen evolution rate of 220 μmol·g


was achieved for β-TaON synthesized at . The factors determining the photocatalytic activity of β-TaON powders were found to be the specific surface area and defects in the β-TaON.

Autor: Songhak Yoon, Alexandra E. Maegli, Santhosh Kumar Matam, Matthias Trottmann, Takashi Hisatomi, Céline Marie Leroy, Michael



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