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The Influence of the Ammonolysis Temperature on the Photocatalytic Activity of β-TaON

The Influence of the Ammonolysis Temperature on the Photocatalytic Activity of β-TaON

Authors :
Songhak Yoon
Alexandra E. Maegli
Santhosh Kumar Matam
Matthias Trottmann
Takashi Hisatomi
Céline Marie Leroy
Michael Grätzel
Simone Pokrant
Anke Weidenkaff
Source :
International Journal of Photoenergy, Vol 2013 (2013)
Publication Year :
2013
Publisher :
Hindawi Limited, 2013.

Abstract

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−1·h−1 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.

Subjects

Subjects :
Renewable energy sources
TJ807-830

Details

Language :
English
ISSN :
1110662X and 1687529X
Volume :
2013
Database :
Directory of Open Access Journals
Journal :
International Journal of Photoenergy
Publication Type :
Academic Journal
Accession number :
edsdoj.b1cce7617d4556ac7b5250625ef313
Document Type :
article
Full Text :
https://doi.org/10.1155/2013/507194