The role of synthesis conditions for structural defects and lattice strain in β-TaON and their effect on photo- and photoelectrocatalysis
| Autor: | Anna Fischer, Thomas Lunkenbein, Martin Rohloff, Sevilay Cosgun, Malte Behrens, Martin Lerch, Cyriac Massué, Anatoliy Senyshyn |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010405 organic chemistry
Rietveld refinement Chemistry business.industry Photoelectrochemistry Chemie Stacking General Chemistry Nitride 010403 inorganic & nuclear chemistry 01 natural sciences 0104 chemical sciences Crystallography Semiconductor Water splitting Charge carrier High-resolution transmission electron microscopy business |
| Zdroj: | Zeitschrift für Naturforschung B |
| ISSN: | 1865-7117 0932-0776 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|