Pressure dependence of electron- and hole-consuming reactions in photocatalytic water splitting on Pt/TiO2 studied by time-resolved IR absorption spectroscopy

Akira Yamakata, Taka Aki Ishibashi, Hiroshi Onishi

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

The decay kinetics of photogenerated electrons in the water splitting reaction on a Pt/TiO2 photocatalyst was studied by time-resolved IR absorption spectroscopy. The decay of the photogenerated electrons within 2 μs was decelerated when the catalyst was exposed to water vapor. The holes were consumed by the reaction with water instead of by the recombination with the electrons. On the other hand, the decay at 10-900 μs was accelerated by the exposure. The electrons were consumed by the reaction with water. The rate of the hole-consuming reaction was independent of the pressure of water vapor, whereas that of the electron-consuming reaction increased with the pressure from 1 to 10 Torr. The different pressure dependences indicate different reactants involved in the oxidative and reductive reactants.

Original languageEnglish
Pages (from-to)7-9
Number of pages3
JournalInternational Journal of Photoenergy
Volume5
Issue number1
DOIs
Publication statusPublished - 2003
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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