Dover, CM;
Grinter, DC;
Yim, CM;
Muryn, CA;
Bluhm, H;
Salmeron, M;
Thornton, G;
(2020)
Orientation of acetic acid hydrogen bonded to acetate terminated TiO2(110).
Surface Science
, 699
, Article 121628. 10.1016/j.susc.2020.121628.
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Abstract
Acetic acid is a common pollutant for which photocatalytic degradation over titania provides a mitigating strategy. Knowledge of the bonding of acetate/acetic acid to this substrate is needed to aid interpretation of the photocatalytic data. In this work we use ambient pressure near edge X-ray absorption fine structure to measure the coverage and geometry of acetate in the TiO2(110) contact layer as well as acetic acid in an additional layer. A saturation coverage of 0.5 monolayers in both layers is found up to an acetic acid pressure of 10−1 Torr at 266 K. The geometry of acetate appears to be unchanged by adsorption of an additional layer of acetic acid, with the contact layer involving a majority acetate species bidentate bonded to neighboring Ti5c sites and a minority acetate species bonded in a perpendicular geometry. Acetic acid has a similar geometry dictated by hydrogen bonding to the contact layer as well as the substrate.
| Type: | Article |
|---|---|
| Title: | Orientation of acetic acid hydrogen bonded to acetate terminated TiO2(110) |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.susc.2020.121628 |
| Publisher version: | https://doi.org/10.1016/j.susc.2020.121628 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Chemistry, Physical, Physics, Condensed Matter, Chemistry, Physics, Model photocatalysis, rutile TiO2(110), acetic acid, ambient pressure photoemission, NEXAFS, FORMIC-ACID, ADSORPTION, SPECTROSCOPY, CARBOXYLATES, BEAMLINE, TIO2 |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10104986 |
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