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Synthesis and Photocatalytic Activity of Perovskite Niobium Oxynitrides with Wide Visible-Light Absorption Bands.
MedLine Citation:
PMID:  21053351     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
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.
Authors:
Bhavin Siritanaratkul; Kazuhiko Maeda; Takashi Hisatomi; Kazunari Domen
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2010-11-4
Journal Detail:
Title:  ChemSusChem     Volume:  -     ISSN:  1864-564X     ISO Abbreviation:  -     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-11-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101319536     Medline TA:  ChemSusChem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan), Fax: (+81) 3-5841-8838.
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