Lanthanoid oxide layers on rhodium-loaded (Ga1-xZn x)(N1-xOx) photocatalyst as a modifier for overall water splitting under visible-light irradiation

Masaaki Yoshida; Kazuhiko Maeda; Daling Lu; Jun Kubota; Kazunari Domen

doi:10.1021/jp402240d

Lanthanoid oxide layers on rhodium-loaded (Ga_1-xZn _x)(N_1-xO_x) photocatalyst as a modifier for overall water splitting under visible-light irradiation

Masaaki Yoshida, Kazuhiko Maeda, Daling Lu, Jun Kubota, Kazunari Domen

Department of Chemistry

Research output: Contribution to journal › Article

32 Citations (Scopus)

Abstract

Lanthanoid oxide modifier layers were applied to Rh metal nanoparticles on (Ga_1-xZn_x)(N_1-xO_x) photocatalyst for overall water splitting under visible-light irradiation. Structural analysis by transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and X-ray absorption spectroscopy revealed that lanthanoid(III) oxide layers coated the Rh nanoparticles on (Ga _1-xZn_x)(N_1-xO_x), although they were also deposited directly on the (Ga_1-xZn_x)(N _1-xO_x) surface. Certain lanthanoid oxide layers (La, Pr, Sm, Gd, and Dy) functioned as modifiers for Rh-metal/(Ga_1-xZn _x)(N_1-xO_x) to produce H₂ and O ₂ gases, although the Rh-metal/(Ga_1-xZn _x)(N_1-xO_x) photocatalyst exhibited little activity for overall water splitting due to rapid water formation from H ₂ and O₂ on Rh. Ce and Eu oxide layers showed no photocatalytic activity, most likely due to their ability to capture photoexcited electrons from Rh-metal/(Ga_1-xZn_x)(N _1-xO_x). The enhancement of photocatalytic activity by lanthanoid oxide loading was shown to be dependent on the formation of redox-inactive lanthanoid(III) oxide layers on the Rh nanoparticles, which effectively suppresses the backward water formation reaction to enable H ₂ evolution on Rh.

Original language	English
Pages (from-to)	14000-14006
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	117
Issue number	27
DOIs	https://doi.org/10.1021/jp402240d
Publication status	Published - 2013 Jul 11

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ASJC Scopus subject areas

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

Cite this

Yoshida, M., Maeda, K., Lu, D., Kubota, J., & Domen, K. (2013). Lanthanoid oxide layers on rhodium-loaded (Ga_1-xZn _x)(N_1-xO_x) photocatalyst as a modifier for overall water splitting under visible-light irradiation. Journal of Physical Chemistry C, 117(27), 14000-14006. https://doi.org/10.1021/jp402240d

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abstract = "Lanthanoid oxide modifier layers were applied to Rh metal nanoparticles on (Ga1-xZnx)(N1-xOx) photocatalyst for overall water splitting under visible-light irradiation. Structural analysis by transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and X-ray absorption spectroscopy revealed that lanthanoid(III) oxide layers coated the Rh nanoparticles on (Ga 1-xZnx)(N1-xOx), although they were also deposited directly on the (Ga1-xZnx)(N 1-xOx) surface. Certain lanthanoid oxide layers (La, Pr, Sm, Gd, and Dy) functioned as modifiers for Rh-metal/(Ga1-xZn x)(N1-xOx) to produce H2 and O 2 gases, although the Rh-metal/(Ga1-xZn x)(N1-xOx) photocatalyst exhibited little activity for overall water splitting due to rapid water formation from H 2 and O2 on Rh. Ce and Eu oxide layers showed no photocatalytic activity, most likely due to their ability to capture photoexcited electrons from Rh-metal/(Ga1-xZnx)(N 1-xOx). The enhancement of photocatalytic activity by lanthanoid oxide loading was shown to be dependent on the formation of redox-inactive lanthanoid(III) oxide layers on the Rh nanoparticles, which effectively suppresses the backward water formation reaction to enable H 2 evolution on Rh.",

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