Visible light response of AgLi1/3M2/3O2 (M = Ti and Sn) synthesized from layered Li2MO3 using molten AgNO3

被引：90

作者：

Hosogi, Yasuhiro ^{[1
]}

Kato, Hideki ^{[1
]}

Kudo, Akihiko ^{[1
,2
]}

机构：

[1] Tokyo Univ Sci, Dept Appl Chem, Shinjyuku Ku, Tokyo 1628601, Japan

[2] Japan Sci & Technol Agcy, CREST, Kawaguchi, Saitama 3320012, Japan

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2008年 / 18卷 / 06期

关键词：

D O I：

10.1039/b715679k

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

AgLi1/3M2/3O2 and AgLi1/3M2/3O2 with delafossite structures were synthesized by treating the layered compounds Li2TiO3 and Li2SnO3 with molten AgNO3 (573 K for 5 h) through ion exchange of Li+ for Ag+. The band gaps of both AgLi1/3M2/3O2 and AgLi1/3M2/3O2 were estimated to be 2.7 eV from diffuse reflectance spectra. These delafossite-type metal oxides showed activity for O-2 evolution from an aqueous silver nitrate solution under visible light irradiation. Moreover, these materials were also active for photocatalytic degradation of methylene blue under irradiation of monochromatic light at 420 nm. The visible light responses of AgLi1/3M2/3O2 and AgLi1/3M2/3O2 were due to the band gap excitation between conduction bands consisting of either Ti 3d or Sn 5s5p orbitals and valence bands consisting of Ag 4d orbitals.

引用

页码：647 / 653

页数：7

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