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

Hideki Kato, Yasuyoshi Sasaki, Nana Shirakura, Akihiko Kudo

    Research output: Contribution to journalArticlepeer-review

    144 Citations (Scopus)

    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%.

    Original languageEnglish
    Pages (from-to)12327-12333
    Number of pages7
    JournalJournal of Materials Chemistry A
    Volume1
    Issue number39
    DOIs
    Publication statusPublished - 2013 Oct 21

    ASJC Scopus subject areas

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

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