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Perspective: A controversial benchmark system for water-oxide interfaces: H₂O/TiO₂(110).

Ulrike Diebold¹

¹Institute of Applied Physics, TU Wien, Wiedner Haupstrasse 8-10/134, A-1040 Vienna, Austria.

The Journal of Chemical Physics

|August 3, 2017

Summary

Water interaction with rutile titanium dioxide (TiO2) surfaces is crucial. Recent experiments show molecular water adsorption is slightly preferred over dissociation on perfect TiO2(110) surfaces.

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Area of Science:

Surface Science
Materials Chemistry
Computational Chemistry

Background:

Rutile titanium dioxide (TiO2) is a prototypical oxide surface.
Understanding water interaction with TiO2(110) is vital for numerous applications.
Previous studies faced challenges due to surface preparation complexities.

Purpose of the Study:

To investigate the adsorption behavior of water on single-crystalline rutile TiO2(110).
To resolve the debate on whether water adsorbs molecularly or dissociates on perfect TiO2(110).
To explore the energy landscape of water adsorption on TiO2(110).

Main Methods:

Experimental techniques including molecular beam and scanning tunneling microscopy (STM).
Computational studies employing density functional theory (DFT).
Analysis of surface defect effects on water dissociation.

Main Results:

Experimental evidence indicates a slight preference for molecular water adsorption (0.035 eV).
A small activation energy (0.36 eV) for water dissociation was determined.
Computational studies highlight the sensitivity of energy differences to DFT approximations.

Conclusions:

Water adsorption on perfect TiO2(110) favors molecularly adsorbed species.
The energy barrier for dissociation is low, suggesting coexistence of states.
Investigating the liquid water-TiO2(110) interface remains a key challenge.