Lindan, P.J.D. and Zhang, C.J. (2005) Exothermic water dissociation on the rutile TiO2(110) surface. Physical Review B, 72 (7). p. 7. ISSN 1098-0121.
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| Official URL http://dx.doi.org/10.1103/PhysRevB.72.075439 |
Abstract
There has been a long-running debate among theorists and experimentalists on the precise nature of water adsorption at the TiO2(110) surface. Some experimentalists argue that dissociative adsorption occurs only at defect sites (O vacancies) and therefore at low coverages. Although there is no doubt that vacancies are strongly reactive, until now there has been no firm understanding of adsorption on a perfect surface with which to contrast behavior. Here we report extensive and very detailed calculations that demonstrate that dissociation of a molecule is exothermic. Experimental findings are rationalized by the existence of a metastable molecular state separated from the dissociated state by a substantial barrier. We show that the barrier varies in height with coverage and with the presence of neighboring adsorbates, and we detail mechanisms for both phenomena. Finally, we reassess photoelectron spectroscopy results, showing their consistency with our predictions.
| Item Type: | Article |
|---|---|
| Additional information: | 47 American Physical Soc 960BF |
| Uncontrolled keywords: | Density- Functional Theory;Molecular-Dynamics simulation; First-Principles calculations;Oxide surfaces |
| Subjects: | Q Science |
| Divisions: | Faculties > Science Technology and Medical Studies > School of Physical Sciences |
| Depositing User: | Maggie Francis |
| Date Deposited: | 09 Sep 2008 21:17 |
| Last Modified: | 14 Jan 2010 14:44 |
| Resource URI: | http://kar.kent.ac.uk/id/eprint/11362 (The current URI for this page, for reference purposes) |
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