The Influence of the Ammonolysis Temperature on the Photocatalytic Activity of β-TaON
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 s...
Saved in:
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2013-01-01
|
| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/2013/507194 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832564627201851392 |
|---|---|
| author | Songhak Yoon Alexandra E. Maegli Santhosh Kumar Matam Matthias Trottmann Takashi Hisatomi Céline Marie Leroy Michael Grätzel Simone Pokrant Anke Weidenkaff |
| author_facet | Songhak Yoon Alexandra E. Maegli Santhosh Kumar Matam Matthias Trottmann Takashi Hisatomi Céline Marie Leroy Michael Grätzel Simone Pokrant Anke Weidenkaff |
| author_sort | Songhak Yoon |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-acb1cce7617d4556ac7b5250625ef313 |
| institution | Kabale University |
| issn | 1110-662X 1687-529X |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-acb1cce7617d4556ac7b5250625ef3132025-02-03T01:10:34ZengWileyInternational Journal of Photoenergy1110-662X1687-529X2013-01-01201310.1155/2013/507194507194The Influence of the Ammonolysis Temperature on the Photocatalytic Activity of β-TaONSonghak Yoon0Alexandra E. Maegli1Santhosh Kumar Matam2Matthias Trottmann3Takashi Hisatomi4Céline Marie Leroy5Michael Grätzel6Simone Pokrant7Anke Weidenkaff8Laboratory for Solid State Chemistry and Catalysis, Empa—Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, CH-8600 Duebendorf, SwitzerlandLaboratory for Solid State Chemistry and Catalysis, Empa—Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, CH-8600 Duebendorf, SwitzerlandLaboratory for Solid State Chemistry and Catalysis, Empa—Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, CH-8600 Duebendorf, SwitzerlandLaboratory for Solid State Chemistry and Catalysis, Empa—Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, CH-8600 Duebendorf, SwitzerlandLaboratory of Photonics and Interfaces, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 6, CH-1015 Lausanne, SwitzerlandLaboratory of Photonics and Interfaces, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 6, CH-1015 Lausanne, SwitzerlandLaboratory of Photonics and Interfaces, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 6, CH-1015 Lausanne, SwitzerlandLaboratory for Solid State Chemistry and Catalysis, Empa—Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, CH-8600 Duebendorf, SwitzerlandLaboratory for Solid State Chemistry and Catalysis, Empa—Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, CH-8600 Duebendorf, SwitzerlandPhase-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.http://dx.doi.org/10.1155/2013/507194 |
| spellingShingle | Songhak Yoon Alexandra E. Maegli Santhosh Kumar Matam Matthias Trottmann Takashi Hisatomi Céline Marie Leroy Michael Grätzel Simone Pokrant Anke Weidenkaff The Influence of the Ammonolysis Temperature on the Photocatalytic Activity of β-TaON International Journal of Photoenergy |
| title | The Influence of the Ammonolysis Temperature on the Photocatalytic Activity of β-TaON |
| title_full | The Influence of the Ammonolysis Temperature on the Photocatalytic Activity of β-TaON |
| title_fullStr | The Influence of the Ammonolysis Temperature on the Photocatalytic Activity of β-TaON |
| title_full_unstemmed | The Influence of the Ammonolysis Temperature on the Photocatalytic Activity of β-TaON |
| title_short | The Influence of the Ammonolysis Temperature on the Photocatalytic Activity of β-TaON |
| title_sort | influence of the ammonolysis temperature on the photocatalytic activity of β taon |
| url | http://dx.doi.org/10.1155/2013/507194 |
| work_keys_str_mv | AT songhakyoon theinfluenceoftheammonolysistemperatureonthephotocatalyticactivityofbtaon AT alexandraemaegli theinfluenceoftheammonolysistemperatureonthephotocatalyticactivityofbtaon AT santhoshkumarmatam theinfluenceoftheammonolysistemperatureonthephotocatalyticactivityofbtaon AT matthiastrottmann theinfluenceoftheammonolysistemperatureonthephotocatalyticactivityofbtaon AT takashihisatomi theinfluenceoftheammonolysistemperatureonthephotocatalyticactivityofbtaon AT celinemarieleroy theinfluenceoftheammonolysistemperatureonthephotocatalyticactivityofbtaon AT michaelgratzel theinfluenceoftheammonolysistemperatureonthephotocatalyticactivityofbtaon AT simonepokrant theinfluenceoftheammonolysistemperatureonthephotocatalyticactivityofbtaon AT ankeweidenkaff theinfluenceoftheammonolysistemperatureonthephotocatalyticactivityofbtaon AT songhakyoon influenceoftheammonolysistemperatureonthephotocatalyticactivityofbtaon AT alexandraemaegli influenceoftheammonolysistemperatureonthephotocatalyticactivityofbtaon AT santhoshkumarmatam influenceoftheammonolysistemperatureonthephotocatalyticactivityofbtaon AT matthiastrottmann influenceoftheammonolysistemperatureonthephotocatalyticactivityofbtaon AT takashihisatomi influenceoftheammonolysistemperatureonthephotocatalyticactivityofbtaon AT celinemarieleroy influenceoftheammonolysistemperatureonthephotocatalyticactivityofbtaon AT michaelgratzel influenceoftheammonolysistemperatureonthephotocatalyticactivityofbtaon AT simonepokrant influenceoftheammonolysistemperatureonthephotocatalyticactivityofbtaon AT ankeweidenkaff influenceoftheammonolysistemperatureonthephotocatalyticactivityofbtaon |