TY - JOUR
T1 - Selective synthesis and photocatalytic oxygen evolution activities of tantalum/nitrogen-codoped anatase, brookite and rutile titanium dioxide
AU - Nishioka, Shunta
AU - Kobayashi, Makoto
AU - Lu, Daling
AU - Kakihana, Masato
AU - Maeda, Kazuhiko
N1 - Funding Information:
K.M. acknowledges Murata Research Foundation for financial support.
Funding Information:
This work was supported by a Grant-in-Aid for Scientific Research on Innovative Area “Mixed Anion” (Projects JP16H06438, JP16H06439 and JP16H06441)” (JSPS). Partial support was also provided by Grants-in-Aid for Young Scientists (A) (JP16H06130) and for Challenging Research (Exploratory) (JP17K19169). S.N. wishes to acknowledge support by a JSPS Fellowship for Young Scientists (JP18J10457).
Publisher Copyright:
© 2019 The Chemical Society of Japan
PY - 2019
Y1 - 2019
N2 - 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 ( > 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.
AB - 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 ( > 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.
KW - Heterogeneous photocatalysis
KW - Oxynitrides
KW - Water splitting
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U2 - 10.1246/bcsj.20190037
DO - 10.1246/bcsj.20190037
M3 - Article
AN - SCOPUS:85068993577
SN - 0009-2673
VL - 92
SP - 1032
EP - 1038
JO - Bulletin of the Chemical Society of Japan
JF - Bulletin of the Chemical Society of Japan
IS - 6
ER -
