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- W1980496473 abstract "Abstract Photocatalytic activities of perovskite‐type niobium oxynitrides (CaNbO 2 N, SrNbO 2 N, BaNbO 2 N, and LaNbON 2 ) were examined for hydrogen and oxygen evolution from water under visible‐light irradiation. These niobium oxynitrides were prepared by heating the corresponding oxide precursors, which were synthesized using the polymerized complex method, for 15 h under a flow of ammonia. They possess visible‐light absorption bands between 600–750 nm, depending on the A‐site cations in the structures. The oxynitride CaNbO 2 N, was found to be active for hydrogen and oxygen evolution from methanol and aqueous AgNO 3 , respectively, even under irradiation by light at long wavelengths ( λ <560 nm). The nitridation temperature dependence of CaNbO 2 N was investigated and 1023 K was found to be the optimal temperature. At lower temperatures, the oxynitride phase is not adequately produced, whereas higher temperatures produce more reduced niobium species (e. g., Nb 3+ and Nb 4+ ), which can act as electron‐hole recombination centers, resulting in a decrease in activity." @default.
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- W1980496473 date "2010-11-04" @default.
- W1980496473 modified "2023-10-18" @default.
- W1980496473 title "Synthesis and Photocatalytic Activity of Perovskite Niobium Oxynitrides with Wide Visible-Light Absorption Bands" @default.
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- W1980496473 doi "https://doi.org/10.1002/cssc.201000207" @default.
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