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Defect-Induced Water Bilayer Growth on Anatase TiO₂(101).

A Schaefer¹, V Lanzilotto², U B Cappel²

¹Department of Chemistry and Chemical Engineering, and Competence Centre for Catalysis , Chalmers University of Technology , 41296 Gothenburg , Sweden.

Langmuir : the ACS Journal of Surfaces and Colloids

|August 29, 2018

Summary

This summary is machine-generated.

Creating oxygen vacancies on anatase titanium dioxide (TiO2) surfaces significantly alters water adsorption. Reduced TiO2 surfaces promote bilayer water growth and dissociation, impacting surface wetting mechanisms.

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Area of Science:

Materials Science
Surface Chemistry
Catalysis

Background:

Stoichiometric anatase titanium dioxide (TiO2) surfaces exhibit distinct water adsorption behaviors.
Surface defects, such as oxygen vacancies, are known to influence oxide surface properties.

Purpose of the Study:

To investigate the effect of oxygen vacancies and reduced Ti species on anatase TiO2(101) water adsorption.
To compare water adsorption chemistry on stoichiometric versus defect-rich TiO2 surfaces.

Main Methods:

Synchrotron radiation excited photoelectron spectroscopy (SR-PES).
Surface preparation of anatase TiO2(101) with controlled oxygen vacancy density.

Main Results:

A shift in water growth mode from layer-by-layer on stoichiometric surfaces to bilayer growth on reduced surfaces.
Observation of Ti3+ enrichment at the surface upon water adsorption.
Concomitant water dissociation into stable hydroxyl groups on the reduced surface.

Conclusions:

Subsurface defects dramatically alter water adsorption and dissociation on TiO2.
Reduced TiO2 surfaces exhibit enhanced thermal stability for adsorbed water and promote further dissociation.
Defect engineering of oxide surfaces can control wetting mechanisms and reactivity.