Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 113, Issue 9, Pages 3785-3792Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp807393a
Keywords
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Funding
- World Premier International Research Center Initiative
- Materials Nanoarchitectonics and by the Global Environment Research Fund, MEXT, Japan
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A novel series of solid-solution semiconductors (AgNbO3)(1-x),(SrTiO3)(x), (0 <= x <= 1) have been developed as highly visible-light-active photocatalysts for efficient 02 evolution and decomposition of organic pollutants. Rietveld refinement reveals that the perovskite-type solid solutions (AgNbO3)(1-x)(SrTiO3)(x), are crystallized in an orthorhombic system (0 <= x < 0.9) or a cubic system (0.9 <= x <= 1). In the mixed valent perovskites (AgNbO3)(1-x)(SrTiO3)(x), the hybridization behaviors between the Ag 4d and O 2p orbitals and between the Nb 4d and Ti 3d orbitals play a crucial role in tuning the energy band structure (band gap, band edge, and bandwidth, etc.) and, thus, in tailoring the photophysical and photocatalytic properties. As a result of competition between the absorption ability to visible-light and the reductive/oxidative abilities, the highest visible-light activities for both O-2 evolution and decomposition of gaseous 2-propanol (IPA) are realized over (AgNbO3)(0.75)(SrTiO3)(0.25). In addition, very fine Ag particles are precipitated on the catalyst surface to construct a nanocomposite structure of Ag/(AgNbO3)(1-x),(SrTiO3)(x), of which the photocatalytic activities are further improved significantly.
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