Hydrogen cycle on CeO2 (111) surfaces: density functional theory calculations

Watkins, Matthew B., Foster, Adam S. and Shluger, Alexander L. (2007) Hydrogen cycle on CeO2 (111) surfaces: density functional theory calculations. The Journal of Physical Chemistry C, 111 (42). pp. 15337-15341. ISSN 1932-7447

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Hydrogen cycle on CeO2 (111) surfaces: density functional theory calculations

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Abstract

We studied the interaction of perfect and lightly reduced ceria (111) surfaces with hydrogen and water molecules using density functional calculations implementing the generalized gradient approximation (GGA) and onsite Coulomb interactions (GGA+U). We predicted the relative surface energies at different states of reduction and in the presence of water, allowing insight into surface processes under a variety of conditions. Several unusual properties of the ceria surface were brought to the fore: the dissociation of water molecules on the ideal surface, the rapid dissociation of water at vacancy sites, and the strongly exothermic dissociation of H2 on the ideal surface. These results have strong implications for the interpretation of experimental data and the construction of reaction schemes for this technologically important metal oxide surface. © 2007 American Chemical Society.

Keywords:Coulomb interactions, Density functional theory, Dissociation, Hydrogen, Surface chemistry, Exothermic dissociation, Generalized gradient approximation (GGA), Surface processes, Cerium compounds
Subjects:F Physical Sciences > F170 Physical Chemistry
Divisions:College of Science > School of Mathematics and Physics
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ID Code:17720
Deposited On:14 Aug 2015 08:37

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