Time-resolved infrared absorption study of photochemical reactions over metal oxides

Akira Yamakata, Taka aki Ishibashi, Kan Takeshita, Hiroshi Onishi

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


The ability of time-resolved IR absorption spectroscopy in tracing photochemical reactions over metal oxides was studied. The primary advantage of this method is the simultaneous detection of photoexcited electrons and chemical species. The current examples presented were TiO2 and NaTaO3. The efficiency of the water splitting reaction on NaTaO3-based catalysts correlated with the quantity of electrons detected by the IR absorption. A short-lived intermediate state of 2-propanol oxidation on TiO2 was identified by its vibrational band at 1640/cm superposed on the structureless absorption of electrons. Ru dye (N3) on a TiO2 film was irradiated with a 532-nm light pulse to simulate dye-sensitized solar cells. The neutralization rate of dye cations and the decay rate of electrons injected in the film were quantified, leading to a three-state model, which described the relaxation of injected electrons. These results demonstrated the ability of this method in tracing photochemical kinetics over metal oxides.

Original languageEnglish
Pages (from-to)211-216
Number of pages6
JournalTopics in Catalysis
Issue number3-4
Publication statusPublished - Jul 2005
Externally publishedYes


  • Dye-sensitized solar cell
  • Photocatalysis
  • Reaction intermediate
  • Reaction kinetics
  • TiO
  • Water-splitting reaction

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)


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