Distribution of Ti3+ surface sites in reduced TiO2

N. Aaron Deskins, Roger Rousseau, Michel Dupuis

Research output: Contribution to journalArticle

143 Citations (Scopus)

Abstract

We describe a DFT + U study of the (110) rutile surface with oxygen vacancies (Ov's). Oxygen vacancies leave behind two excess unpaired electrons per Ov, leading formally to the formation of two Ti 3+ ions. We investigate the location of the Ti3+ ions within the first three surface layers. In total, we obtained 49 unique solutions of possible Ti3+ pairs, to examine the stability of all Ti types (e.g., five-coordinated surface Ti, six-coordinated surface Ti, subsurface sites, etc.). Our results show that subsurface sites are preferred but that many configurations are close in energy, within up to 0.3-0.4 eV of each other. In contrast to findings in previous work, we show that sites directly adjacent to the Ov's are unstable. Analysis of our results shows that the two Ti3+ ions within a pair behave independently of each other, as there are little electronic interactions between the excess electrons associated with these sites. We also examined the migration of Ti3+ sites from the surface into the bulk and find the surface locations to be preferred by ∼0.5 eV relative to the bulk. Our systematic results provide a comprehensive picture of excess electrons that indicates that they are not trapped or localized at specific sites but are distributed across several sites due to nearly degenerate Ti3+ states.

Original languageEnglish
Pages (from-to)7562-7572
Number of pages11
JournalJournal of Physical Chemistry C
Volume115
Issue number15
DOIs
Publication statusPublished - Apr 21 2011

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Oxygen vacancies
Ions
oxygen
Electrons
ions
electrons
rutile
surface layers
Discrete Fourier transforms
configurations
electronics
interactions
energy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Distribution of Ti3+ surface sites in reduced TiO2 . / Deskins, N. Aaron; Rousseau, Roger; Dupuis, Michel.

In: Journal of Physical Chemistry C, Vol. 115, No. 15, 21.04.2011, p. 7562-7572.

Research output: Contribution to journalArticle

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