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What are the adsorption sites for CO on the reduced TiO2(110)-1 x 1 surface?
Yan Zhao1, Zhuo Wang, Xuefeng Cui
1Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, PR China.
Abstract:
We report our experimental study of the adsorption and diffusion of CO on clean TiO(2)(110)-1 x 1 at an atom-resolved scale with in situ scanning tunneling microscopy at 80 K, combined with density functional theory calculations. Our results reveal that the CO adsorption sites on the TiO(2)(110)-1 x 1 surface are preferentially located at next-nearest-neighbor five-coordinate Ti atoms close to a bridge-bonded oxygen vacancy (BBO(V)), in contrast to the idea that the BBO(V) itself acts as the adsorption site for CO. The equilibrium distribution of CO adsorption on the TiO(2)(110)-1 x 1 surface can be well-understood according to the calculated adsorption energies of different sites.
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