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Frontiers of Physics

, 13:138107 | Cite as

Dissociation of liquid water on defective rutile TiO2 (110) surfaces using ab initio molecular dynamics simulations

  • Hui-Li Wang (王会丽)
  • Zhen-Peng Hu (胡振芃)
  • Hui Li (李晖)
Research article
  • 44 Downloads
Part of the following topical collections:
  1. Inorganic Two-Dimensional Nanomaterials

Abstract

In order to obtain a comprehensive understanding of both thermodynamics and kinetics of water dissociation on TiO2, the reactions between liquid water and perfect and defective rutile TiO2 (110) surfaces were investigated using ab initio molecular dynamics simulations. The results showed that the free-energy barrier (~4.4 kcal/mol) is too high for a spontaneous dissociation of water on the perfect rutile (110) surface at a low temperature. The most stable oxygen vacancy (Vo1) on the rutile (110) surface cannot promote the dissociation of water, while other unstable oxygen vacancies can significantly enhance the water dissociation rate. This is opposite to the general understanding that Vo1 defects are active sites for water dissociation. Furthermore, we reveal that water dissociation is an exothermic reaction, which demonstrates that the dissociated state of the adsorbed water is thermodynamically favorable for both perfect and defective rutile (110) surfaces. The dissociation adsorption of water can also increase the hydrophilicity of TiO2.

Keywords

ab initio molecular dynamics rutile (110) free energy barrier spontaneous reaction exothermic reaction 

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Copyright information

© Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Hui-Li Wang (王会丽)
    • 1
    • 3
  • Zhen-Peng Hu (胡振芃)
    • 1
  • Hui Li (李晖)
    • 2
  1. 1.School of PhysicsNankai UniversityTianjinChina
  2. 2.Beijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijingChina
  3. 3.Institute of PhysicsChinese Academy of SciencesBeijingChina

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