Photocatalytic activities of layered titanates and niobates ion-exchanged with Sn2+ under visible light irradiation

Yasuhiro Hosogi, Hideki Kato, Akihiko Kudo

研究成果: Article査読

91 被引用数 (Scopus)

抄録

Energy gaps (EG) of Sn2+-exchanged layered metal oxides, Sn 2+/KTiNbO5, Sn2+/K4Nb 6O17, Sn2+/CsTi2NbO7, Sn2+/K2Ti4O9, Sn2+/K 2Ti2O5, and Sn2+/Cs 2Ti6O13, were 0.7-1.2 eV narrower than those of the original layered metal oxides. The Sn2+-exchanged layered metal oxides had visible-light absorption bands that were due to the electronic transition from an electron donor level (a valence band maximum) consisting of Sn5s orbitals to conduction bands consisting of Ti3d and Nb4d orbitals. The potential of the electron donor level negatively shifted as the amount of ion-exchanged Sn2+ increased. They showed photocatalytic activities for H2 evolution from an aqueous methanol solution under visible light irradiation. Sacrificial oxidation of Sn2+ also proceeded partly accompanied with the H2 evolution. Sn2+/K 4Nb6O17 also showed an activity for O 2 evolution from an aqueous silver nitrate solution under visible light irradiation. The stable Sn2+ in Sn2+/K 4Nb6O17 to redox reactions contributed to the photocatalytic H2 and O2 evolution reactions in the presence of sacrificial reagents.

本文言語English
ページ(範囲)17678-17682
ページ数5
ジャーナルJournal of Physical Chemistry C
112
45
DOI
出版ステータスPublished - 2008 11 13
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • エネルギー(全般)
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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