Water Splitting on Ti-Oxide-Terminated SrTiO3(001)
| Autor: | Debi Garai, David A. Duncan, Pardeep K. Thakur, Vladyslav Solokha, Kurt Hingerl, Jörg Zegenhagen, Axel Wilson |
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| Přispěvatelé: | DIAMOND Light source |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Hydrogen chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Oxygen 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Catalysis General Energy Adsorption X-ray photoelectron spectroscopy chemistry Desorption Monolayer Water splitting [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat] Physical and Theoretical Chemistry 0210 nano-technology ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Journal of Physical Chemistry C Journal of Physical Chemistry C, American Chemical Society, 2019, 123 (28), pp.17232-17238. ⟨10.1021/acs.jpcc.9b01730⟩ The Journal of Physical Chemistry C |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | Combining X-ray photoelectron spectroscopy with the standing wave technique, we investigated adsorption of a monolayer of water on Ti-oxide-terminated SrTiO3(001) in ultra-high vacuum (UHV). At room temperature, the surface is water-free but hydroxylated. A quarter monolayer of hydroxyl is tightly bound 1.85 ± 0.06 A above the TiO2 surface. Deposited at a low temperature, a monolayer of water adsorbs with the oxygen located 2.55 ± 0.2 A above the surface, apparently close to atop Ti, but H2O is unstable at 200 K. A fraction desorbs, in part under the X-ray beam, but a major fraction of H2O dissociates immediately, with the liberated hydrogen most likely attaching to a surface oxygen. The produced hydroxyls bind only loosely to the surface, are unstable at 200 K, and rapidly desorb once the surface is water-free. Although our study was conducted in UHV, the presented results suggest that Ti-oxide-terminated SrTiO3(001) may possess a high catalytic activity toward hydrolysis under realistic conditions. |
| Databáze: | OpenAIRE |
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