Time-resolved infrared spectroscopy of K3Ta3B 2O12 photocatalysts for water splitting

Toshitatsu Ikeda, Satoru Fujiyoshi, Hideki Kato, Akihiko Kudo, Hiroshi Onishi

研究成果: Article査読

25 被引用数 (Scopus)

抄録

Electrons photoexcited in K3Ta3B2O 12, an efficient photocatalyst for the water-splitting reaction driven by ultraviolet light, were observed using time-resolved IR absorption spectroscopy with microsecond resolution. When the catalyst was irradiated with 266 nm light pulses, a structureless absorption appeared at 3000-1500 cm -1. The absorption was assigned to the optical transition of electrons that were band gap-excited and then trapped in mid-gap states. The absorbance decayed with a time delay because of the electron-hole recombination. The rate of recombination in an argon atmosphere was sensitive to the composition of the starting material used in the catalyst preparation. The electron decay was accelerated by exposing the catalyst to water vapor. The degree of acceleration was qualitatively correlated with the H2 production rate observed during steady-state light irradiation.

本文言語English
ページ(範囲)7883-7886
ページ数4
ジャーナルJournal of Physical Chemistry B
110
15
DOI
出版ステータスPublished - 2006 4 20
外部発表はい

ASJC Scopus subject areas

  • 物理化学および理論化学
  • 表面、皮膜および薄膜
  • 材料化学

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