Yim, CM;
Chen, J;
Zhan, Y;
Shaw, B-J;
Pang, CL;
Grinter, DC;
Bluhm, H;
... Thornton, G; + view all
(2018)
Visualization of Water-Induced Surface Segregation of Polarons on Rutile TiO2(110).
Journal of Physical Chemistry Letters
, 9
(17)
pp. 4865-4871.
10.1021/acs.jpclett.8b01904.
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Abstract
Water-oxide surfaces are ubiquitous in nature and of widespread importance to phenomena like corrosion as well as contemporary industrial challenges such as energy production through water splitting. So far, a reasonably robust understanding of the structure of such interfaces under certain conditions has been obtained. Considerably less is known about how overlayer water modifies the inherent reactivity of oxide surfaces. Here we address this issue experimentally for rutile TiO2(110) using scanning tunneling microscopy and photoemission, with complementary density functional theory calculations. Through detailed studies of adsorbed water nanoclusters and continuous water overlayers, we determine that excess electrons in TiO2 are attracted to the top surface layer by water molecules. Measurements on methanol show similar behavior. Our results suggest that adsorbate-induced surface segregation of polarons could be a general phenomenon for technologically relevant oxide materials, with consequences for surface chemistry and the associated catalytic activity.
| Type: | Article |
|---|---|
| Title: | Visualization of Water-Induced Surface Segregation of Polarons on Rutile TiO2(110) |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/acs.jpclett.8b01904 |
| Publisher version: | https://doi.org/10.1021/acs.jpclett.8b01904 |
| 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, Technology, Chemistry, Physical, Nanoscience & Nanotechnology, Materials Science, Multidisciplinary, Physics, Atomic, Molecular & Chemical, Chemistry, Science & Technology - Other Topics, Materials Science, Physics, EXCESS ELECTRONS, TIO2 SURFACES, OH GROUPS, INTERFACE, OXIDATION, CHEMISTRY, DISSOCIATION, ADSORPTION, DEFECTS, OXIDE |
| 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 UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10057109 |
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