Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 112, Issue 26, Pages 9872-9879Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp711929d
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The oxidation and photo-oxidation of water on the rutile TiO2(110) surface is investigated using density functional theory (DFT) calculations. We investigate the relative stability of different surface terminations of TiO2 interacting with H2O and analyze the overpotential needed for the electrolysis and photoelectrolysis of water. We found that the most difficult step in the splitting of water process is the reaction of a H2O molecule with a vacancy in the surface to form an adsorbed hydroxyl group (OH*). Comparison to experiment shows that the computed overpotential for O-2 evolution (0.78 V) is available under the experimental conditions required for both oxygen and hydrogen evolution.
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