Acetone-assisted oxygen vacancy diffusion on TiO 2(110)

Yaobiao Xia, Bo Zhang, Jingyun Ye, Qingfeng Ge, Zhenrong Zhang

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

We have studied the dynamic relationship between acetone and bridge-bonded oxygen (O b) vacancy (V O) defect sites on the TiO 2(110)-1 - 1 surface using scanning tunneling microscopy (STM) and density function theory (DFT) calculations. We report an adsorbate-assisted V O diffusion mechanism. The STM images taken at 300 K show that acetone preferably adsorbs on the V O site and is mobile. The sequential isothermal STM images directly show that the mobile acetone effectively migrates the position of V O by a combination of two acetone diffusion channels: one is the diffusion along the O b row and moving as an alkyl group, which heals the initial V O; another is the diffusion from the O b row to the five-coordinated Ti 4+ row and then moving along the Ti 4+ row as an acetone, which leaves a V O behind. The calculated acetone diffusion barriers for the two channels are comparable and agree with experimental results.

Original languageEnglish (US)
Pages (from-to)2970-2974
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume3
Issue number20
DOIs
StatePublished - Oct 18 2012

Keywords

  • Interfaces
  • Porous Materials
  • Surfaces
  • and Catalysis

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