How water flips at charged titanium dioxide: An SFG-study on the water–TiO2 interface

Journal article


Publication Details

Author(s): Schlegel SJ, Hosseinpour S, Gebhard M, Devi A, Bonn M, Backus EH
Journal: Physical Chemistry Chemical Physics
Publication year: 2019
Volume: 21
Journal issue: 17
Pages range: 8956-8964
ISSN: 1463-9076
eISSN: 1463-9084


Abstract

Photocatalytic splitting of water into hydrogen and oxygen by utilizing sunlight and a photocatalyst is a promising way of generating clean energy. Here, we report a molecular-level study on heavy water (D
2
O) interacting with TiO
2
as a model photocatalyst. We employed the surface specific technique Sum-Frequency-Generation (SFG) spectroscopy to determine the nature of the hydrogen bonding environment and the orientation of interfacial water molecules using their OD-stretch vibrations as reporters. By examining solutions with various pD-values, we observe an intensity-minimum at around pD 5, corresponding to the balance of protonation and deprotonation of TiO
2
(point of zero charge). The majority of water molecules' deuterium atoms point away from the interface when the pD is below 5, and point towards the surface when the pD is higher than 5, with strong hydrogen bonds towards the surface.


FAU Authors / FAU Editors

Hosseinpour, Saman Dr.
Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik


External institutions with authors

Argonne National Laboratory
Max-Planck-Institut für Polymerforschung (MPI-P) / Max Planck Institute for Polymer Research


How to cite

APA:
Schlegel, S.J., Hosseinpour, S., Gebhard, M., Devi, A., Bonn, M., & Backus, E.H. (2019). How water flips at charged titanium dioxide: An SFG-study on the water–TiO2 interface. Physical Chemistry Chemical Physics, 21(17), 8956-8964. https://dx.doi.org/10.1039/c9cp01131e

MLA:
Schlegel, Simon J., et al. "How water flips at charged titanium dioxide: An SFG-study on the water–TiO2 interface." Physical Chemistry Chemical Physics 21.17 (2019): 8956-8964.

BibTeX: 

Last updated on 2019-16-05 at 09:23