Energy structure and photocatalytic activity for water splitting of Sr2(Ta1-XNbX)2O7 solid solution

Hideki Kato, Akihiko Kudo

Research output: Contribution to journalArticlepeer-review

94 Citations (Scopus)


Photophysical and photocatalytic properties of Sr2(Ta1-XNbX)2O7 with layered perovskite structure were studied to explore the possibility of energy structure control by making a solid solution. The band gap of Sr2(Ta1-XNbX)2O7 was decreased as the ratio of niobium to tantalum was increased. The Sr2(Ta1-XNbX)2O7 solid solution photocatalysts loaded with NiO co-catalysts decomposed water into H2 and O2 in a stoichiometric ratio. A NiO/Sr2Ta2O7 photocatalyst showed the highest activity. The photocatalytic activity was drastically decreased by substitution of a small amount of niobium (X=0.05) for tantalum. However, a Sr2(Ta0.75Nb0.25)2O7 photocatalyst showed a relatively high activity among the solid solutions of Sr2(Ta1-XNbX)2O7(0<X<1). The activities of Sr2(Ta1-XNbX)2O7 solid solution photocatalysts depended on the conduction band level and the efficiency of non-radiative recombination between photogenerated electron-hole pairs.

Original languageEnglish
Pages (from-to)129-133
Number of pages5
JournalJournal of Photochemistry and Photobiology A: Chemistry
Issue number1-2
Publication statusPublished - 2001 Nov 29
Externally publishedYes


  • Energy structure
  • Niobate
  • Photocatalyst
  • Solid solution
  • Tantalete
  • Water splitting

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)


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