Infrared spectroscopic study of the potential change at cocatalyst particles on oxynitride photocatalysts for water splitting by visible light irradiation

Xuwang Lu; Athula Bandara; Masao Katayama; Akira Yamakata; Jun Kubota; Kazunari Domen

doi:10.1021/jp207484q

Infrared spectroscopic study of the potential change at cocatalyst particles on oxynitride photocatalysts for water splitting by visible light irradiation

Xuwang Lu, Athula Bandara, Masao Katayama, Akira Yamakata, Jun Kubota, Kazunari Domen

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

15 Citations (Scopus)

Abstract

Visible light-induced changes in Pt/(Ga_1-xZn_x)(N _1-xO_x), Pt/TaON, and Pt/LaTiO₂N powder photocatalysts were investigated using infrared spectroscopy with adsorbed CO probe molecules on Pt cocatalysts. Among these photocatalyst materials, only the (Ga_1-xZn_x)(N_1-xO_x) photocatalyst has achieved overall water splitting with visible-light irradiation, although all of these materials have suitable band gaps for the reaction. For Pt/(Ga _1-xZn_x)(N_1-xO_x) and Pt/TaON, the C-O stretching vibrations of adsorbed CO on Pt shifted to a lower frequency under visible light irradiation. However, no frequency shift was observed for Pt/LaTiO₂N. This lower-frequency shift indicates a negative electronic potential shift of the Pt cocatalysts, which results in hydrogen evolution. Differences in the light intensity dependence of the potential shifts of these photocatalysts were observed, and the involvement of a different recombination mechanism of photoexcited carriers in these photocatalysts will be discussed. These results clarify some of the reasons for the activities of various photocatalytic materials for overall water splitting.

Original language	English
Pages (from-to)	23902-23907
Number of pages	6
Journal	Journal of Physical Chemistry C
Volume	115
Issue number	48
DOIs	https://doi.org/10.1021/jp207484q
Publication status	Published - Dec 8 2011
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Energy(all)
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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title = "Infrared spectroscopic study of the potential change at cocatalyst particles on oxynitride photocatalysts for water splitting by visible light irradiation",

abstract = "Visible light-induced changes in Pt/(Ga1-xZnx)(N 1-xOx), Pt/TaON, and Pt/LaTiO2N powder photocatalysts were investigated using infrared spectroscopy with adsorbed CO probe molecules on Pt cocatalysts. Among these photocatalyst materials, only the (Ga1-xZnx)(N1-xOx) photocatalyst has achieved overall water splitting with visible-light irradiation, although all of these materials have suitable band gaps for the reaction. For Pt/(Ga 1-xZnx)(N1-xOx) and Pt/TaON, the C-O stretching vibrations of adsorbed CO on Pt shifted to a lower frequency under visible light irradiation. However, no frequency shift was observed for Pt/LaTiO2N. This lower-frequency shift indicates a negative electronic potential shift of the Pt cocatalysts, which results in hydrogen evolution. Differences in the light intensity dependence of the potential shifts of these photocatalysts were observed, and the involvement of a different recombination mechanism of photoexcited carriers in these photocatalysts will be discussed. These results clarify some of the reasons for the activities of various photocatalytic materials for overall water splitting.",

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AU - Lu, Xuwang

AU - Bandara, Athula

AU - Katayama, Masao

AU - Yamakata, Akira

AU - Kubota, Jun

AU - Domen, Kazunari

PY - 2011/12/8

Y1 - 2011/12/8

N2 - Visible light-induced changes in Pt/(Ga1-xZnx)(N 1-xOx), Pt/TaON, and Pt/LaTiO2N powder photocatalysts were investigated using infrared spectroscopy with adsorbed CO probe molecules on Pt cocatalysts. Among these photocatalyst materials, only the (Ga1-xZnx)(N1-xOx) photocatalyst has achieved overall water splitting with visible-light irradiation, although all of these materials have suitable band gaps for the reaction. For Pt/(Ga 1-xZnx)(N1-xOx) and Pt/TaON, the C-O stretching vibrations of adsorbed CO on Pt shifted to a lower frequency under visible light irradiation. However, no frequency shift was observed for Pt/LaTiO2N. This lower-frequency shift indicates a negative electronic potential shift of the Pt cocatalysts, which results in hydrogen evolution. Differences in the light intensity dependence of the potential shifts of these photocatalysts were observed, and the involvement of a different recombination mechanism of photoexcited carriers in these photocatalysts will be discussed. These results clarify some of the reasons for the activities of various photocatalytic materials for overall water splitting.

AB - Visible light-induced changes in Pt/(Ga1-xZnx)(N 1-xOx), Pt/TaON, and Pt/LaTiO2N powder photocatalysts were investigated using infrared spectroscopy with adsorbed CO probe molecules on Pt cocatalysts. Among these photocatalyst materials, only the (Ga1-xZnx)(N1-xOx) photocatalyst has achieved overall water splitting with visible-light irradiation, although all of these materials have suitable band gaps for the reaction. For Pt/(Ga 1-xZnx)(N1-xOx) and Pt/TaON, the C-O stretching vibrations of adsorbed CO on Pt shifted to a lower frequency under visible light irradiation. However, no frequency shift was observed for Pt/LaTiO2N. This lower-frequency shift indicates a negative electronic potential shift of the Pt cocatalysts, which results in hydrogen evolution. Differences in the light intensity dependence of the potential shifts of these photocatalysts were observed, and the involvement of a different recombination mechanism of photoexcited carriers in these photocatalysts will be discussed. These results clarify some of the reasons for the activities of various photocatalytic materials for overall water splitting.

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Infrared spectroscopic study of the potential change at cocatalyst particles on oxynitride photocatalysts for water splitting by visible light irradiation

Abstract

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