Issue 39, 2013
From the journal:

Journal of Materials Chemistry A

Synthesis of highly active rhodium-doped SrTiO3 powders in Z-scheme systems for visible-light-driven photocatalytic overall water splitting†

Hideki Kato,‡a   Yasuyoshi Sasaki,a   Nana Shirakuraa  and  Akihiko Kudo*ab  

* Corresponding authors

a Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
E-mail: a-kudo@rs.kagu.tus.ac.jp
Fax: +81-3-5261-4631
Tel: +81-3-5228-8267

b Photocatalysis International Research Center, Research Institute for Science and Technology, Tokyo University of Science, Japan

Abstract

Two-step excitation photocatalytic systems called Z-scheme systems are attractive to achieve overall water splitting under visible light irradiation. The low activity of SrTiO3:Rh as a H2-evolving photocatalyst suppresses the overall efficiency of the Z-scheme system composed of SrTiO3:Rh modified with a Pt or Ru cocatalyst, BiVO4, and an Fe3+/Fe2+ electron mediator. In this study, improvement of efficiency for water splitting over the Z-scheme system has been achieved through the preparation of highly efficient SrTiO3:Rh photocatalysts by hydrothermal and polymerizable complex methods. It has also been revealed that excess amounts of Sr are necessary to obtain highly active SrTiO3:Rh photocatalysts. Apparent quantum yields of the Z-scheme systems were improved from 0.4% to 3.9–4.2% at 420 nm when SrTiO3:Rh prepared by HT and PC methods was used as a H2-evolving photocatalyst instead of that prepared by a solid state reaction. The efficiency of the improved Z-scheme system for solar energy conversion was determined to be 0.1%.

Graphical abstract: Synthesis of highly active rhodium-doped SrTiO3 powders in Z-scheme systems for visible-light-driven photocatalytic overall water splitting

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Article information

DOI
https://doi.org/10.1039/C3TA12803B
Article type
Paper
Submitted
19 Jul 2013
Accepted
09 Aug 2013
First published
09 Aug 2013

J. Mater. Chem. A, 2013,1, 12327-12333

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Synthesis of highly active rhodium-doped SrTiO3 powders in Z-scheme systems for visible-light-driven photocatalytic overall water splitting

H. Kato, Y. Sasaki, N. Shirakura and A. Kudo, J. Mater. Chem. A, 2013, 1, 12327 DOI: 10.1039/C3TA12803B

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