Water splitting into H2 and O2 over niobate and titanate photocatalysts with (111) plane-type layered perovskite structure

Yugo Miseki, Hideki Kato, Akihiko Kudo

研究成果: Article査読

233 被引用数 (Scopus)

抄録

Photophysical and photocatalytic properties of A5Nb 4O15 (A = Sr and Ba), Ba3LaNb3O 12, ALa4Ti4O15 (A = Ca, Sr, and Ba), and La4Ti3O12 with layered perovskite structures, in which a plane in parallel with (111) of a simple perovskite structure was exposed at interlayer, were investigated. These oxides were obtained by a polymerizable complex method at 973-1473 K though only A 5Nb4O15 (A = Sr and Ba) were prepared by a solid state reaction even at 1673 K. The shapes of these complex metal oxides were plate-like derived from the perovskite layered structure. These band gaps were estimated to be 3.7-4.1 eV from the onsets of diffuse reflection spectra. These oxides showed photoluminescence at 77 K. These oxides loaded with NiO cocatalysts showed activities for water splitting under UV irradiation. NiO x/BaLa4Ti4O15 and NiO x/Ba5Nb4O15 showed the highest activities among the titanates and niobates tested in the present study. NiOx/BaLa4Ti4O15 and NiO x/Ba5Nb4O15 gave 15% and 17% of quantum yields at 270 nm, respectively. Photocatalytic activities of ALa 4Ti4O15 (A = Ca, Sr, and Ba) strongly depended on the alkaline earth metal ion. Pt, Au, Ni, and PbO2 were selectively photodeposited on basal or edge plane of the BaLa4Ti 4O15 plate-like powder while these were randomly loaded on CaLa4Ti4O15. It was suggested that this difference in the surface property was the one of the important factors affecting photocatalytic ability for ALa4Ti4O15 (A = Ca, Sr, and Ba).

本文言語English
ページ(範囲)306-314
ページ数9
ジャーナルEnergy and Environmental Science
2
3
DOI
出版ステータスPublished - 2009 5月 26
外部発表はい

ASJC Scopus subject areas

  • 環境化学
  • 再生可能エネルギー、持続可能性、環境
  • 原子力エネルギーおよび原子力工学
  • 汚染

フィンガープリント

「Water splitting into H2 and O2 over niobate and titanate photocatalysts with (111) plane-type layered perovskite structure」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル