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The role of synthesis conditions for structural defects and lattice strain in β-TaON and their effect on photo- and photoelectrocatalysis

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Massué,  Cyriac
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Lunkenbein,  Thomas
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Rohloff, M., Cosgun, S., Massué, C., Lunkenbein, T., Senyshyn, A., Lerch, M., et al. (2019). The role of synthesis conditions for structural defects and lattice strain in β-TaON and their effect on photo- and photoelectrocatalysis. Zeitschrift für Naturforschung B, 74(1), 71-83. doi:10.1515/znb-2018-0171.


Cite as: https://hdl.handle.net/21.11116/0000-0002-CA7C-0
Abstract
The importance of the synthesis conditions on the structural and photocatalytic properties of tantalum oxide nitride was investigated by comparing two variants of phase-pure β-TaON obtained from application of two different synthesis routes, leading to one unstrained and one heavily anisotropically microstrained β-TaON as shown by XRD-based Rietveld refinement. HRTEM images reveal the origin of the strain to be lattice defects such as stacking faults. The strained β-TaON was found to be the clearly less active semiconductor in photochemical and photoelectrochemical water oxidation. The lattice defects are assumed to act as charge carrier traps hindering the photo-generated holes to be displaced to the reaction sites at the surface.