Chemisorbed and Physisorbed Water at the TiO2/Water Interface

Hosseinpour S, Tang F, Wang F, A. Livingstone R, Schlegel S, Ohto T, Bonn M, Nagata Y, Backus E (2017)

Publication Type: Journal article

Publication year: 2017

Journal

Journal of Physical Chemistry Letters American Chemical Society

Book Volume: 8

Pages Range: 2195-2199

URI: https://pubs.acs.org/doi/10.1021/acs.jpclett.7b00564

DOI: 10.1021/acs.jpclett.7b00564

Open Access Link: https://pubs.acs.org/doi/10.1021/acs.jpclett.7b00564

Abstract

The interfacial structure of water in contact with TiO2 is the key to understand the mechanism of photocatalytic water dissociation as well as photoinduced superhydrophilicity. We investigate the interfacial molecular structure of water at the surface of anatase TiO2, using phase-sensitive sum frequency generation spectroscopy together with spectra simulation using ab initio molecular dynamic trajectories. We identify two oppositely oriented, weakly and strongly hydrogen-bonded subensembles of O-H groups at the superhydrophilic UV irradiated TiO2 surface. The water molecules with weakly hydrogen-bonded O-H groups are chemisorbed, i.e. form hydroxyl groups, at the TiO2 surface with their hydrogen atoms pointing toward bulk water. The strongly hydrogen-bonded O-H groups interact with the oxygen atom of the chemisorbed water. Their hydrogen atoms point toward the TiO2. This strong interaction between physisorbed and chemisorbed water molecules causes superhydrophilicity.

Authors with CRIS profile

Saman Hosseinpour Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik

Involved external institutions

Max-Planck-Institut für Polymerforschung (MPI-P) / Max Planck Institute for Polymer Research DE Germany (DE) Osaka University JP Japan (JP)

How to cite

APA:

Hosseinpour, S., Tang, F., Wang, F., A. Livingstone, R., Schlegel, S., Ohto, T.,... Backus, E. (2017). Chemisorbed and Physisorbed Water at the TiO2/Water Interface. Journal of Physical Chemistry Letters, 8, 2195-2199. https://dx.doi.org/10.1021/acs.jpclett.7b00564

MLA:

Hosseinpour, Saman, et al. "Chemisorbed and Physisorbed Water at the TiO2/Water Interface." Journal of Physical Chemistry Letters 8 (2017): 2195-2199.

BibTeX: Download