Die u:cris Detailansicht:

Water Adsorption at the Tetrahedral Titania Surface Layer of SrTiO3(110)-(4 × 1)

Autor(en)
Zhiming Wang, Xianfeng Hao, Stefan Gerhold, Zbynek Novotny, Cesare Franchini, Eamon McDermott, Karina Schulte, Michael Schmid, Ulrike Diebold
Abstrakt

The interaction of water with oxide surfaces is of great interest for both fundamental science and applications. We present a combined theoretical (density functional theory (DFT)) and experimental (scanning tunneling microscopy (STM) and photoemission spectroscopy (PES)) study of water interaction with the two-dimensional titania overlayer that terminates the SrTiO3(110)-(4 ? 1) surface and consists of TiO4 tetrahedra. STM and core-level and valence band PES show that H2O neither adsorbs nor dissociates on the stoichiometric surface at room temperature, whereas it does dissociate at oxygen vacancies. This is in agreement with DFT calculations, which show that the energy barriers for water dissociation on the stoichiometric and reduced surfaces are 1.7 and 0.9 eV, respectively. We propose that water weakly adsorbs on two-dimensional, tetrahedrally coordinated overlayers.

Organisation(en)
Computergestützte Materialphysik
Externe Organisation(en)
Technische Universität Wien, Lund University
Journal
The Journal of Physical Chemistry Part C (Nanomaterials and Interfaces)
Band
117
Seiten
26060-26069
Anzahl der Seiten
10
ISSN
1932-7447
DOI
https://doi.org/10.1021/jp407889h
Publikationsdatum
11-2013
Peer-reviewed
Ja
ÖFOS 2012
103009 Festkörperphysik, 103015 Kondensierte Materie, 103025 Quantenmechanik, 103036 Theoretische Physik
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/cfe4944f-0768-4f41-9ae0-96fcdaa9398c