Control of valence band potential and photocatalytic properties of Na xLa1-xTaO1+2xN2-2x oxynitride solid solutions

Koichiro Ueda; Hideki Kato; Makoto Kobayashi; Michikazu Hara; Masato Kakihana

doi:10.1039/c3ta10257b

Control of valence band potential and photocatalytic properties of Na _xLa_1-xTaO_1+2xN_2-2x oxynitride solid solutions

Koichiro Ueda, Hideki Kato, Makoto Kobayashi, Michikazu Hara, Masato Kakihana

Research output: Contribution to journal › Article › peer-review

55 Citations (Scopus)

Abstract

A series of oxynitride solid solutions, Na_xLa _1-xTaO_1+2xN_2-2x with x = 0.1, 0.2, 0.25, 0.3, 0.5, 0.75 and 0.85, was successfully synthesized by nitridation of amorphous oxide precursors under an NH₃ stream at 1273 K. The band gaps of the solid solutions increased with the Na content. Photoelectrochemical analysis was conducted to obtain information on the band potentials of the solid solutions. The valence band maxima of the solid solutions were at more positive potentials than that of LaTaON₂ (x = 0). Solid solutions of Na _xLa_1-xTaO_1+2xN_2-2x with x = 0.20-0.85 exhibited photocatalytic activity for both H₂ and O ₂ evolution under visible light irradiation in the presence of sacrificial reagents, while LaTaON₂ had no activity for O₂ evolution. The achievement of O₂ evolution with these solid solutions is due to control of the valence band potential; therefore, control of the photocatalytic properties of LaTaON₂ was achieved by the formation of solid solutions.

Original language	English
Pages (from-to)	3667-3674
Number of pages	8
Journal	Journal of Materials Chemistry A
Volume	1
Issue number	11
DOIs	https://doi.org/10.1039/c3ta10257b
Publication status	Published - 2013 Mar 21

ASJC Scopus subject areas

Chemistry(all)
Renewable Energy, Sustainability and the Environment
Materials Science(all)

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Access to Document

10.1039/c3ta10257b

Cite this

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title = "Control of valence band potential and photocatalytic properties of Na xLa1-xTaO1+2xN2-2x oxynitride solid solutions",

abstract = "A series of oxynitride solid solutions, NaxLa 1-xTaO1+2xN2-2x with x = 0.1, 0.2, 0.25, 0.3, 0.5, 0.75 and 0.85, was successfully synthesized by nitridation of amorphous oxide precursors under an NH3 stream at 1273 K. The band gaps of the solid solutions increased with the Na content. Photoelectrochemical analysis was conducted to obtain information on the band potentials of the solid solutions. The valence band maxima of the solid solutions were at more positive potentials than that of LaTaON2 (x = 0). Solid solutions of Na xLa1-xTaO1+2xN2-2x with x = 0.20-0.85 exhibited photocatalytic activity for both H2 and O 2 evolution under visible light irradiation in the presence of sacrificial reagents, while LaTaON2 had no activity for O2 evolution. The achievement of O2 evolution with these solid solutions is due to control of the valence band potential; therefore, control of the photocatalytic properties of LaTaON2 was achieved by the formation of solid solutions.",

author = "Koichiro Ueda and Hideki Kato and Makoto Kobayashi and Michikazu Hara and Masato Kakihana",

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T1 - Control of valence band potential and photocatalytic properties of Na xLa1-xTaO1+2xN2-2x oxynitride solid solutions

AU - Ueda, Koichiro

AU - Kato, Hideki

AU - Kobayashi, Makoto

AU - Hara, Michikazu

AU - Kakihana, Masato

PY - 2013/3/21

Y1 - 2013/3/21

N2 - A series of oxynitride solid solutions, NaxLa 1-xTaO1+2xN2-2x with x = 0.1, 0.2, 0.25, 0.3, 0.5, 0.75 and 0.85, was successfully synthesized by nitridation of amorphous oxide precursors under an NH3 stream at 1273 K. The band gaps of the solid solutions increased with the Na content. Photoelectrochemical analysis was conducted to obtain information on the band potentials of the solid solutions. The valence band maxima of the solid solutions were at more positive potentials than that of LaTaON2 (x = 0). Solid solutions of Na xLa1-xTaO1+2xN2-2x with x = 0.20-0.85 exhibited photocatalytic activity for both H2 and O 2 evolution under visible light irradiation in the presence of sacrificial reagents, while LaTaON2 had no activity for O2 evolution. The achievement of O2 evolution with these solid solutions is due to control of the valence band potential; therefore, control of the photocatalytic properties of LaTaON2 was achieved by the formation of solid solutions.

AB - A series of oxynitride solid solutions, NaxLa 1-xTaO1+2xN2-2x with x = 0.1, 0.2, 0.25, 0.3, 0.5, 0.75 and 0.85, was successfully synthesized by nitridation of amorphous oxide precursors under an NH3 stream at 1273 K. The band gaps of the solid solutions increased with the Na content. Photoelectrochemical analysis was conducted to obtain information on the band potentials of the solid solutions. The valence band maxima of the solid solutions were at more positive potentials than that of LaTaON2 (x = 0). Solid solutions of Na xLa1-xTaO1+2xN2-2x with x = 0.20-0.85 exhibited photocatalytic activity for both H2 and O 2 evolution under visible light irradiation in the presence of sacrificial reagents, while LaTaON2 had no activity for O2 evolution. The achievement of O2 evolution with these solid solutions is due to control of the valence band potential; therefore, control of the photocatalytic properties of LaTaON2 was achieved by the formation of solid solutions.

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