Density functional theory (DFT) study of ozone adsorption on dehydrated nanocrystalline TiO2 is presented. Singlet and triplet binding modes of ozone to the oxide's titanium cations are considered. In both the modes, monodentate and bidentate ozone complexes are formed. According to DFT, the triplet monodentates are the most stable species. The formation of monodentate ozone adsorption complexes is in-line with an earlier interpretation of infrared (IR) spectroscopic data on ozone adsorption on an anatase surface. However, the computed difference in the fundamental vibrational frequencies (ν1 - ν3) of ozone in the triplet monodentates is significantly larger than the corresponding IR value. This discrepancy is resolved by demonstrating that the triplet monodentates readily decompose, realizing molecular oxygen that is consistent with published experimental data. The predicted energy barrier of the dissociative adsorption is less than 2 kcal/mol. In contrast, the computed difference in the fundamental vibrational frequencies (ν1 - ν3) of adsorbed ozone in the singlet bidentates perfectly agrees with the experiment.

Original languageEnglish
Pages (from-to)1930-1936
Number of pages7
JournalLangmuir
Volume36
Issue number8
Early online date10 Feb 2020
DOIs
StatePublished - 3 Mar 2020

    Scopus subject areas

  • Condensed Matter Physics
  • Materials Science(all)
  • Spectroscopy
  • Surfaces and Interfaces
  • Electrochemistry

    Research areas

  • MOLECULAR CALCULATIONS, INFRARED-SPECTRA, IR-SPECTRA, ADSORPTION, WATER, DFT, STABILITY, ORIGIN, ENERGY, BAND

ID: 52167381