Probing reaction mechanisms in mixed phase TiO2 by EPR

D. C. Hurum, A. G. Agrios, S. E. Crist, Kimberly A Gray*, T. Rajh, M. C. Thurnauer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

223 Scopus citations

Abstract

Charge separation processes in mixed phase TiO2 photocatalysts are investigated by electron paramagnetic resonance (EPR) spectroscopy. The mechanisms of interfacial electron transfer, subsequent charge migration and recombination at surface sites, and other interfacial effects on chlorophenol/TiO2 chemistry have been probed. Distorted interfacial sites have been observed and are proposed as catalytically reactive hot spots. This detailed knowledge of charge transfer processes is critical to the nanoscale design of catalysts and subsequent improvement of catalytic efficiency.

Original languageEnglish (US)
Pages (from-to)155-163
Number of pages9
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume150
Issue number2-3
DOIs
StatePublished - Feb 1 2006

Keywords

  • Anatase
  • Electron paramagnetic resonance (EPR)
  • Interfacial charge transfer
  • Mixed phase TiO
  • Photocatalysis
  • Rutile

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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