Journal
SURFACE SCIENCE
Volume 605, Issue 13-14, Pages 1275-1280Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.susc.2011.04.015
Keywords
Water; Adsorption; Rutile TiO2; DFT; Born Oppenheimer Molecular Dynamics
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Density Functional Theory (DFT), based on both static and Born-Oppenheimer Molecular Dynamics approaches, has been used to investigate the effect of hydrogen bonds and temperature on the water monolayer adsorption on the rutile TiO2 (110) face. It was demonstrated that the difference between some previous theoretical results and experimental data is due to too slim slab thickness model and/or too small surface area. According to the present static calculations, water monolayer adsorbs molecularly on the fivefold titanium atoms of an optimised five-layer slab thickness, due to the stabilising lateral hydrogen bonds between molecules. From the molecular dynamics simulations, two adsorption mechanisms were described as a function of temperature. Finally, it was pointed out that the dynamics of water adsorption is strongly influenced by the structural model used. When temperature increases, the monolayer dissociates gradually. However, because of the periodic boundary conditions, the 1 x 1 surface unit needs to be extended to at least 2 x 5 to get an accurate representation of the monolayer dissociation ratio. In these conditions, this ratio is around 20%, 25% and 33% at 270, 350 and 425 K, respectively. (C) 2011 Elsevier B.V. All rights reserved.
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