Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 14, Issue 48, Pages 16595-16602Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2cp42288c
Keywords
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Funding
- DoE-BES, Chemical Sciences, Geosciences and Biosciences Division [DE-FG02-12ER16286]
- Office of Science of the U. S. Department of Energy [DE-AC02-05CH11231]
- U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- Princeton Institute for Computational Science and Engineering
- Princeton University Office of Information Technology
- Direct For Mathematical & Physical Scien
- Division Of Mathematical Sciences [1040196] Funding Source: National Science Foundation
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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 H-2 desorption barriers. While H-2 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.
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