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A First-Principles Computational Comparison of the Aqueous Anatase TiO2 (001) Interface and the Disordered, Fluorinated TiO2 Interface

preprint
submitted on 12.09.2018 and posted on 12.09.2018 by Kyle Reeves, Damien Dambournet, Christel Laberty-Robert, Rodolphe Vuilleumier, Mathieu Salanne
Chemical doping and other surface modifications have been used to engineer the bulk properties of materials, but their influence on the surface structure and consequently the surface chemistry are often unknown. Previous work has been successful in fluorinating anatase TiO2 with charge balance achieved via the introduction of Ti vacancies rather than the reduction of Ti. Our work here investigates the interface between this fluorinated titanate with cationic vacancies and a
monolayer of water via density functional theory based molecular dynamics. We compute the projected density of states for only those atoms at the interface and for those states that fall within 1eV of the Fermi energy for various steps throughout the simulation, and we determine that the
variation in this representation of the density of states serves as a reasonable tool to anticipate where surfaces are most likely to be reactive. In particular, we conclude that water dissociation at the surface is the main mechanism that influences the anatase (001) surface whereas the change in
the density of states at the surface of the fluorinated structure is influenced primarily through the adsorption of water molecules at the surface.

Funding

ANR-11-IDEX-0004-02 (LabEx MATISSE)

History

Email Address of Submitting Author

mathieu.salanne@sorbonne-universite.fr

Institution

Sorbonne Université

Country

France

ORCID For Submitting Author

0000-0002-1753-491X

Declaration of Conflict of Interest

No conflict of interest

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