Nucleation and Growth of Palladium Clusters on Anatase TiO2(101) Surface: A First Principle Study

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School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China, and Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, China
* To whom correspondence should be addressed. E-mail: [email protected]
†Tianjin University.
Cite this: J. Phys. Chem. C 2008, 112, 49, 19506–19515
Publication Date (Web):November 14, 2008
Copyright © 2008 American Chemical Society
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The nucleation and growth of palladium clusters supported on anatase TiO2(101) surface has been studied using periodic supercell models and density functional theory. The most active site for single Pd adatom on the perfect TiO2(101) surface is the bridge site formed by two two-coordinated oxygen (2cO) atoms at the step edge with the highest adsorption energy of 2.18 eV. On the defective surface, the effect of oxygen vacancy on Pd nucleation is not as strong as that in the Pt or Au deposition case. The shift of active sites for the Pd dimer growing to trimer on the perfect anatase TiO2(101) surface is observed. On both perfect and defective anatase surfaces, the adsorbed Pd3 clusters prefer to form planar triangles and the adsorbed Pd4 and Pd5 clusters tend to three-dimensional structures. The nucleation and growth of Pd clusters at the anatase TiO2(101) surface is mainly driven by the interaction between Pd and surface atoms when the cluster size is less than four. The strength of Pd−Pd interaction turns out to control dominantly the Pd deposition process as the Pd cluster gets larger.

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