H2 evolution from an aqueous methanol solution on SrTiO3 photocatalysts codoped with chromium and tantalum ions under visible light irradiation

Tatsuya Ishii, Hideki Kato, Akihiko Kudo

研究成果: Article査読

318 被引用数 (Scopus)

抄録

SrTiO3 photocatalysts doped with chromium ions showed photocatalytic activities for H2 evolution from an aqueous methanol solution under visible light irradiation. However, it had a long induction period. Codoping of niobium or tantalum ions with chromium ions shortened the induction period, and increased the photocatalytic activities in respect of the H2 evolution. The photocatalytic activities of chromium- and chromium/tantalum-doped SrTiO3 were improved when they were pretreated at 773 K in the hydrogen reduction atmosphere. Codoping of tantalum ions suppressed the formation of Cr6+ ions and oxygen defects which would work as nonradiative recombination centers between photogenerated electrons and holes, resulting in the shortening of induction periods and the improvement of photocatalytic activities.

本文言語English
ページ(範囲)181-186
ページ数6
ジャーナルJournal of Photochemistry and Photobiology A: Chemistry
163
1-2
DOI
出版ステータスPublished - 2004 4 15
外部発表はい

ASJC Scopus subject areas

  • 化学 (全般)
  • 化学工学(全般)
  • 物理学および天文学(全般)

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