The effect of co-catalyst for Z-scheme photocatalysis systems with an Fe3+/Fe2+ electron mediator on overall water splitting under visible light irradiation

Yasuyoshi Sasaki, Akihide Iwase, Hideki Kato, Akihiko Kudo

Research output: Contribution to journalArticlepeer-review

302 Citations (Scopus)

Abstract

Co-catalysts loaded on SrTiO3:Rh in visible-light-driven Z-scheme photocatalysis systems consisting of SrTiO3:Rh for H2 evolution, BiVO4 for O2 evolution, and Fe3+/Fe2+ for an electron mediator were investigated. The activity of the system using a Ru co-catalyst for overall water splitting was as high as that of the system using a Pt co-catalyst. The photocatalytic activity of the system using the Pt co-catalyst decreased as the partial pressures of evolved H2 and O2 were increased. In contrast, such deactivation was not observed for the system using the Ru co-catalyst. The investigation of the back-reactions revealed that water formation from H2 and O2, reduction of Fe3+ by H2, and oxidation of Fe2+ by O2 were significantly suppressed in the system using the Ru co-catalyst, resulting in good photocatalytic performance for water splitting. The (Ru/SrTiO3:Rh)-(BiVO4)-(Fe3+/Fe2+) photocatalysis system gave a quantum yield of 0.3% and a stable activity more than 70 h. This system was confirmed to be active for water splitting using a solar simulator.

Original languageEnglish
Pages (from-to)133-137
Number of pages5
JournalJournal of Catalysis
Volume259
Issue number1
DOIs
Publication statusPublished - 2008 Oct 1
Externally publishedYes

Keywords

  • Co-catalyst
  • Heterogeneous photocatalysis
  • Ruthenium
  • Solar hydrogen
  • Visible light
  • Water splitting
  • Z-scheme

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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