Visible light responsive pristine metal oxide photocatalyst: Enhancement of activity by crystallization under hydrothermal treatment

Fumiaki Amano, Akira Yamakata, Kohei Nogami, Masatoshi Osawa, Bunsho Ohtani

Research output: Contribution to journalShort surveypeer-review

209 Citations (Scopus)

Abstract

Photocatalytic activities of amorphous and crystal bismuth tungstate (Bi2WO6) were investigated using oxidative decomposition of gaseous acetaldehyde under visible light irradiation (>400 nm). Here, for the first time, negligible photocatalytic activity of amorphous Bi 2WO6 owing to the fast recombination of electron-hole pairs and the high quantum efficiency of Bi2WO6 crystallites under visible light were demonstrated by action spectrum analysis and time-resolved infrared absorption measurements. Crystallization of the amorphous phase provided a red shift of the photoabsorption edge and marked increase in the lifetime of photoexcited electrons, resulting in an increase of photocatalytic activity.

Original languageEnglish
Pages (from-to)17650-17651
Number of pages2
JournalJournal of the American Chemical Society
Volume130
Issue number52
DOIs
Publication statusPublished - Dec 31 2008
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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