Time-Resolved infrared absorption study of natao3 photocatalysts doped with alkali earth metals

Motoji Maruyama, Akihide Iwase, Hideki Kato, Akihiko Kudo, Hiroshi Onishi

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

Electron-hole recombination kinetics was observed in NaTaO3 photocatalysts doped with Ca, Sr, Ba, and La using time-resolved infrared absorption. The recombination rate was compared with the ultraviolet light-derived H2 production rate in the water splitting reaction to estimate the electron-to-H2 conversion efficiency. The conversion efficiency was sensitive to the nanometer-scale topography of the photocatalyst surface. The particularly high efficiency on the nondoped and 0.5 mol % Sr-doped photocatalysts was related to the flat (100) crystalline surfaces exposed on the photocatalyst particles. The mobility of holes was suggested to be restricted by doping on the basis of a kinetic simulation of the recombination rate.

Original languageEnglish
Pages (from-to)13918-13923
Number of pages6
JournalJournal of Physical Chemistry C
Volume113
Issue number31
DOIs
Publication statusPublished - 2009 Aug 6
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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