Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.041
Publication date: 6th July 2018
LaTaON21,2 is a well-known perovskite-type material with defined composition, oxidation state, and physical properties, which make it favorable for solar water splitting.3 This Ta5+-containing oxynitride can be synthesized, e.g. from LaTaO4. The crucial synthetic step for perovskite-type oxynitrides is the ammonolysis, typically a thermal treatment in flowing NH3. Several parameters such as temperature and heating ramp, reaction time, and gas flow rate have to be carefully adjusted.4,5 Besides, the anionic composition can be altered via the adjustment of the precursor reactivity. A thorough tuning of all above mentioned parameters allowed us a controlled variation of the anionic composition from LaTaON2 to LaTaO2N. This consequently leads to a reduction of Ta5+ to Ta4+. A great influence of this oxidation state change on the physical properties, particularly the light absorption, the charge separation, and the surface redox activity, is expected.6
References:
(1) Marchand, R.; Pors, F.; Laurent, Y. Ann. Chim. Fr. 1991, 16, 553–560.
(2) Marchand, R.; Antoine, P.; Laurent, Y. J. Solid State Chem. 1993, 107, 34–38.
(3) Liu, M.; You, W.; Lei, Z.; Takata, T.; Domen, K.; Li, C. Chinese J. Catal. 2006, 27 (7), 556–558.
(4) Ebbinghaus, S. G.; Abicht, H. P.; Dronskowski, R.; Müller, T.; Reller, A.; Weidenkaff, A. Prog. Solid State Chem. 2009, 37 (2-3), 173–205.
(5) Widenmeyer, M.; Peng, C.; Baki, A.; Xie, W.; Niewa, R.; Weidenkaff, A. Solid Sate Sci. 2016, 54, 7–16.
(6) Bubeck, C.; Widenmeyer, M.; Richter, G.; Coduri, M.; Salas Colera, E.; Yoon, S.; Osterloh, F.; Weidenkaff, A. in preparation.
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