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Water splitting on Ti-oxide terminated SrTiO3(001)
Authors:
Vladyslav
Solokha
(Diamond Light Source; Johannes Kepler Universität Linz)
,
Debi
Garai
(Diamond Light Source; Amity University)
,
Axel
Wilson
(Diamond Light Source)
,
David A.
Duncan
(Diamond Light Source)
,
Pardeep K.
Thakur
(Diamond Light Source)
,
Kurt
Hingerl
(Johannes Kepler Universität Linz)
,
Jorg
Zegenhagen
(Diamond Light Source)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
The Journal Of Physical Chemistry C
State:
Published (Approved)
Published:
June 2019
Diamond Proposal Number(s):
15132

Abstract: Combining X-ray photoelectron spectroscopy with the standing wave technique we investigated adsorption of a monolayer of water on Ti-oxide terminated SrTiO3(001) in ultra-high vacuum (UHV). At room temperature, the surface is water free but hydroxylated. A quarter monolayer of hydroxyl is tightly bound (1.85 ± 0.06) Å above the TiO2 surface. Deposited at low temperature, a monolayer of water adsorbs with the oxygen located (2.55 ± 0.2) Å above the surface, apparently close to atop Ti, but H2O is unstable at 200K. A fraction desorbs, in part under the X-ray beam, but a major fraction of H2O dissociates immediately, with the liberated hydrogen most likely attaching to a surface oxygen. The produced hydroxyls bind only loosely to the surface, are unstable at 200K and rapidly desorb once the surface is water-free. Although our study was conducted in UHV, the presented results suggests that Ti-oxide terminated SrTiO3(001) may possess a high catalytic activity toward hydrolysis under realistic conditions.
Journal Keywords: Hydroxyls; Oxides; Monolayers; Oxygen; Physical and chemical processes
Subject Areas:
Chemistry,
Energy,
Environment
Instruments:
I09-Surface and Interface Structural Analysis
Added On:
01/07/2019 14:02
Documents:
bn6y56y.pdf
Discipline Tags:
Surfaces
Earth Sciences & Environment
Sustainable Energy Systems
Energy
Physics
Climate Change
Physical Chemistry
Catalysis
Chemistry
Technical Tags:
Diffraction
Spectroscopy
X-ray Standing Wave (XSW)
X-ray Photoelectron Spectroscopy (XPS)