Quantum molecular dynamics study of water onTiO2(110) surface
2009 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 129, no 064703Article in journal (Refereed) Published
The adsorption of water on perfect TiO2(110) surface is studied by quantum molecular dynamics simulation adopting a periodic model formed by five water molecules on a (5 x 1) surface unit cell of a five layer slab of TiO2. The total simulation time is 3.2 ps. At about 1.3 ps, one water molecule dissociates with the help of other adsorbed waters and surface bridging oxygens. During the remaining 1.9 ps, the waters and OH groups vibrate, but no more dissociation or recombination is observed. By comparing recent experimental O1s photoemission (x-ray photoelectron spectroscopy) spectra of H2O/TiO2(110) to the computed spectrum of the adsorbate in the configurations supplied by the molecular dynamics simulation, the observed peaks can be attributed to different oxygen species. The proposed assignment of the main spectral features supports the occurrence of partial water dissociation (similar to 20%) also on a perfect TiO2 surface.
Place, publisher, year, edition, pages
2009. Vol. 129, no 064703
adsorption; rutile; h2o; dissociation; tio2; pseudopotentials; 1st-principles; transition; simulation; metals
IdentifiersURN: urn:nbn:se:kth:diva-10325DOI: 10.1063/1.2955452ISI: 000258490600055ScopusID: 2-s2.0-49749121868OAI: oai:DiVA.org:kth-10325DiVA: diva2:214758
QC 201008192009-05-062009-05-062010-12-07Bibliographically approved