Photodynamics of NaTaO3 Catalysts for Efficient Water Splitting

Akira Yamakata, Taka Aki Ishibashi, Hideki Kato, Akihiko Kudo, Hiroshi Onishi

Research output: Contribution to journalArticle

124 Citations (Scopus)

Abstract

Electrons photoexcited in catalysts based on NaTaO3 were observed by time-resolved infrared (IR) absorption spectroscopy. The electrons excited by 266-nm pump pulse exhibited a monotonic absorption of mid-IR light. The recombination kinetics of the excited electrons with holes was monitored in a vacuum as a function of time delay ranging from 100 ns to 1 s. When the Na content and La dopant were optimized to achieve high activity in the steady-state reaction of water splitting, the recombinative decay was hindered to increase the amount of electrons. The electrons were transferred to NiO ultrafine particles, loaded as a cocatalyst, within 1 μs following the pulse excitation. Exposing the catalysts to water vapor affected the electron decay and efficient electron transfer to water via the cocatalyst was evidenced.

Original languageEnglish
Pages (from-to)14383-14387
Number of pages5
JournalJournal of Physical Chemistry B
Volume107
Issue number51
DOIs
Publication statusPublished - 2003 Dec 25

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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