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Issue 48, 2012
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Hydrogen interaction with the anatase TiO2(101) surface

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Abstract

The interaction of atomic hydrogen with the majority (101) surface of anatase TiO2 is studied using density functional theory calculations both with a standard semi-local functional and with the inclusion of on-site Coulomb repulsion terms. We investigate the energetics of different adsorption configurations at surface and subsurface sites and different coverages, from low to one monolayer, as well as diffusion pathways among the different sites and recombinative H2 desorption barriers. While H2 desorption is the energetically most favorable process, the diffusion of H into the subsurface is found to be at least equally favorable kinetically. It is further shown that subsurface oxygen vacancies on reduced anatase are favorable adsorption sites for hydrogen atoms.

Graphical abstract: Hydrogen interaction with the anatase TiO2(101) surface

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Article information


Submitted
05 Jul 2012
Accepted
08 Aug 2012
First published
28 Aug 2012

Phys. Chem. Chem. Phys., 2012,14, 16595-16602
Article type
Paper

Hydrogen interaction with the anatase TiO2(101) surface

U. Aschauer and A. Selloni, Phys. Chem. Chem. Phys., 2012, 14, 16595 DOI: 10.1039/C2CP42288C

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