Selective Synthesis and Photocatalytic Oxygen Evolution Activities of Tantalum/Nitrogen-Codoped Anatase, Brookite and Rutile Titanium Dioxide

Tantalum/nitrogen codoped titanium dioxide (TiO2:Ta,N) having a rutile structure has recently been reported to be a good photocatalyst for visible-light water oxidation. In this work, three different polymorphs of TiO2:Ta,N (anatase, brookite and rutile) were synthesized by a hydrothermal method usi...

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Bibliographic Details
Published in:Bulletin of the Chemical Society of Japan 2019, Vol.92 (6), p.1032-1038
Main Authors: Nishioka, Shunta, Kobayashi, Makoto, Lu, Daling, Kakihana, Masato, Maeda, Kazuhiko
Format: Article
Language:English
Subjects:
Ammonia
Anatase
Brookite
Catalytic activity
Chemical evolution
Light water
Nitrogen
Oxidation
Photocatalysis
Photocatalysts
Rutile
Strontium titanates
Tantalum
Titanium
Titanium dioxide
Water splitting
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Summary:Tantalum/nitrogen codoped titanium dioxide (TiO2:Ta,N) having a rutile structure has recently been reported to be a good photocatalyst for visible-light water oxidation. In this work, three different polymorphs of TiO2:Ta,N (anatase, brookite and rutile) were synthesized by a hydrothermal method using water-soluble titanium/tantalum complexes as precursors, followed by thermal nitridation with dry ammonia gas. Effects of the physicochemical properties on photocatalytic activity for O2 evolution from an aqueous silver nitrate solution under visible light (λ > 400 nm) were investigated. Experimental results indicated that defect formation during the nitridation procedure was the dominant factor for photocatalytic activity. Anatase TiO2:Ta,N was the most active for O2 evolution among the three polymorphs, and also served as an O2 evolution photocatalyst in Z-scheme overall water splitting in combination with Rh-doped strontium titanate (SrTiO3:Rh) and an Fe3+/Fe2+ redox-shuttle mediator.
ISSN:0009-2673
1348-0634
DOI:10.1246/bcsj.20190037