Relationship between cation arrangement and photocatalytic activity for Sr-Al-Nb-O double perovskite

Hironori Iwakura, Hisahiro Einaga, Yasutake Teraoka

研究成果: ジャーナルへの寄稿学術誌査読

18 被引用数 (Scopus)

抄録

The relationship between the photocatalytic activity and the arrangement of metal cations was investigated with Sr-Al-Nb-O double perovskite (SAN) synthesized at 1400 °C for various calcination times using a solid state reaction. Transmission electron microscopic observation revealed that SAN particles had a domain structure of completely B-site ordered (Sr 2AlNbO6) and disordered (SrAl0.5Nb 0.5O3) phases. The ordered phase fraction was determined using a newly proposed mixed-phase model for the Rietveld refinement and a method using the relative intensity of the superlattice line of powder X-ray diffraction. It turned out that the mass fraction of the ordered phase in SAN calcined at 1400 °C could be controlled by the calcination time as 33% (10 h), 37% (20 h), 44% (30 h), and 48% (50 h). Photocatalytic activities of SAN for the evolution of H2 and O2 respectively from aqueous solutions of methanol and AgF decreased with increasing the calcination time, that is, with increasing the fraction of the ordered phase. These results suggested that the photocatalytic activity of ordered Sr2AlNbO 6 should be lower than that of disordered SrAl0.5Nb 0.5O3. This is practically the first report to reveal the photocatalytic activity of SAN as well as the effect of cation ordering in oxides on the photocatalytic activity.

本文言語英語
ページ(範囲)11362-11369
ページ数8
ジャーナルInorganic chemistry
49
24
DOI
出版ステータス出版済み - 12月 20 2010

!!!All Science Journal Classification (ASJC) codes

  • 物理化学および理論化学
  • 無機化学

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