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Acta Phys. -Chim. Sin.  2015, Vol. 31 Issue (7): 1315-1322    DOI: 10.3866/PKU.WHXB201504222
THEORETICAL AND COMPUTATIONAL CHEMISTRY     
A Dramatic Influence of Ti Atom on the Electronic Structures of (Al16Ti)n± (n=0?3) Ionic Clusters and Their Interaction with H2O Molecules
LIU Yi-Liang1, HUA Ya-Wen1, JIANG Gang2, CHEN Jun3
1 College of Electrical and Information Engineering, Southwest University for Nationalities, Chengdu 610041, P. R. China;
2 Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, P. R. China;
3 Science and Technology on Surface Physics and Chemistry Laboratory, China Academy of Engineering Physics, Mianyang 621907, Sichuan Province, P. R. China
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Abstract  

The most stable (Al16Ti)n± (n=0-3) ions were modeled and optimized using density functional theory combined with all-electron spin-polarized calculations. The geometries, stabilities, and electronic structures of the (Al16Ti)n ± (n=0-3) ionic clusters, as well as the adsorption structures and adsorption energies of H2O molecules on the (Al16Ti)n± (n=0-3) ionic clusters, were studied. The results were compared with those obtained for pure (Al17Ti)n± (n=0-3) ionic clusters. The spatial distributions of the highest occupied molecular orbitals and the lowest unoccupied molecular orbitals for the (Al16Ti)n± (n=0-3) ionic clusters showed that the free electrons tend to occupy Ti sites. And a few residual free electrons would occupy sites with large curvatures. An extensive structure search was performed to identify the low-energy conformations of (Al16TiH2O)n± (n=0-3) complexes. Based on the geometries of the studied adsorption complexes, it was found that the most stable structures were prone to oxygen-based adsorption onto Ti atom. (Al16TiH2O)+ ion featured the shortest average O―H bond length, that was ~0.0003 nm longer than that observed in isolated H2O molecule. The O―H bond length increased with either increasing or decreasing number of the electrons. The studies implied that Ti dopant in Al ionic clusters improved the dissociation efficiency of H2O molecules. Furthermore, the doping effect played a more important role than the geometry effect in determining the electronic structures of the (Al16Ti)n ionic clusters and their interaction with H2O molecules.



Key words(Al16Ti)n±      (n=0-3) ions      Adsorption of H2O molecule      Geometric structure      Electronic structure      Effect of doping     
Received: 19 January 2015      Published: 22 April 2015
MSC2000:  O641  
  O561.1  
Fund:  

The project was supported by the Special Funds of the National Natural Science Foundation of China (11247232), Scientific Research Foundation of the Education Department of Sichuan Province, China (14ZB0465), and Fundamental Research Fund for the Central Universities, Southwest University for Nationalities, China (2015NYB05).

Corresponding Authors: LIU Yi-Liang     E-mail: swunliu@163.com
Cite this article:

LIU Yi-Liang, HUA Ya-Wen, JIANG Gang, CHEN Jun. A Dramatic Influence of Ti Atom on the Electronic Structures of (Al16Ti)n± (n=0?3) Ionic Clusters and Their Interaction with H2O Molecules. Acta Phys. -Chim. Sin., 2015, 31(7): 1315-1322.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201504222     OR     http://www.whxb.pku.edu.cn/Y2015/V31/I7/1315

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