Effects of accumulated electrons on the decay kinetics of photogenerated electrons in Pt/TiO2 photocatalyst studied by time-resolved infrared absorption spectroscopy

Akira Yamakata, Taka Aki Ishibashi, Hiroshi Onishi

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

The effects of accumulated electrons on the decay kinetics of photogenerated electrons in Pt/TiO2 photocatalyst were examined using time-resolved infrared (TR-IR) absorption spectroscopy. When the catalyst was irradiated by a UV pulse in the presence of methanol gas, the lifetime of the electrons was drastically elongated through the effective hole-consuming reaction by the adsorbed methoxy groups. When the catalyst was further irradiated by a second UV pulse in the presence of these long-lived electrons, the number of electrons generated by the second pulse was smaller than that generated by the first pulse though these pulse energies were the same. By increasing the interval between these two pulses, the number of electrons generated by the second pulse was gradually restored to equal that generated by the first pulse. These changes were ascribed to the enhancement of the rate of electron-hole recombination due to the long-lived electrons.

Original languageEnglish
Pages (from-to)33-36
Number of pages4
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume160
Issue number1-2
DOIs
Publication statusPublished - Aug 7 2003
Externally publishedYes

Keywords

  • Infrared absorption
  • Kinetics
  • Methanol
  • Photocatalyst
  • Pt/TiO

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)

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