Interaction of SrO-terminated SrTiO3 surface with oxygen, carbon dioxide, and water

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Title: Interaction of SrO-terminated SrTiO3 surface with oxygen, carbon dioxide, and water
Authors: Staykov, A
Fukumori, S
Yoshizawa, K
Sato, K
Ishihara, T
Kilner, J
Item Type: Journal Article
Abstract: The interaction of SrO terminated SrTiO3 surface with molecular carbon dioxide and water has been investigated using first-principle theoretical methods and surface analysis techniques. We have studied the formation of a surface SrCO3 layer and various possible products of H2O interaction with the SrO surface, such as, surface chemisorbed water and the formation of a surface hydroxide layer. The co-adsorption of CO2 and H2O was explained both theoretically and experimentally showing that its products follow a complex temperature dependence and as a result, the surface composition may vary between carbonate and surface chemisorbed water. Our theoretical simulations have shown that the presence of water molecules in the gas phase might assist the molecular oxygen/lattice oxygen exchange reaction by stabilization of the surface oxo species in the transition state with a hydrogen bond mechanism. As a result, the activation barrier for molecular oxygen dissociation is decreased leading to an increase in the surface exchange rate constant. Our study demonstrates that the SrO terminated SrTiO3 surface is not static but instead, dynamically responds to external factors such as gas composition, humidity, and temperature. As a result, the surface phases can show different trends for the surface exchange reaction with molecular oxygen by either an increase or decrease in the exchange rate.
Issue Date: 7-Dec-2018
Date of Acceptance: 26-Oct-2018
URI: http://hdl.handle.net/10044/1/66189
DOI: https://dx.doi.org/10.1039/c8ta05177a
ISSN: 2050-7496
Publisher: Royal Society of Chemistry
Start Page: 22662
End Page: 22672
Journal / Book Title: Journal of Materials Chemistry A
Volume: 6
Issue: 45
Copyright Statement: © 2018 The Royal Society of Chemistry.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/P026478/1
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Energy & Fuels
Materials Science, Multidisciplinary
Chemistry
Materials Science
TOTAL-ENERGY CALCULATIONS
OXIDE
DIFFUSION
CRYSTAL
VISUALIZATION
PEROVSKITES
REDUCTION
EXCHANGE
CATHODE
Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Energy & Fuels
Materials Science, Multidisciplinary
Chemistry
Materials Science
TOTAL-ENERGY CALCULATIONS
OXIDE
DIFFUSION
CRYSTAL
VISUALIZATION
PEROVSKITES
REDUCTION
EXCHANGE
CATHODE
Publication Status: Published
Embargo Date: 2019-10-26
Online Publication Date: 2018-10-26
Appears in Collections:Faculty of Engineering
Materials



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