Effects of Hydroxy Groups in Anthraquinone Dyes on Photocatalytic Activity of Visible-light-sensitized Pt-TiO2 for Hydrogen Evolution

Fumiaki Amano, Yasukazu Akaki, Akira Yamakata

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Abstract: Alizarin (1,2-dihydroxyanthraquinone) is a stable red photoredox sensitizer. We explored the effect of the hydroxy substituents of 9,10-anthraquinone (AQ) molecules on the photocatalytic hydrogen evolution over a dye-sensitized Pt-TiO2 system under visible-light irradiation. The 2-hydroxy group in AQ dyes was necessary to induce photocatalytic H2 evolution. By contrast, the 1-hydroxy group was the anchoring group to increase the adsorption amount of the dyes on the TiO2 surface. Using time-resolved infrared spectroscopy, we found that the 2-hydroxy group enhances the electron injection and suppresses the back electron transfer from TiO2 particles to the dye. Graphical Abstract: [Figure not available: see fulltext.]

Original languageEnglish
JournalCatalysis Surveys from Asia
DOIs
Publication statusAccepted/In press - 2022

Keywords

  • Dye-sensitized photocatalyst
  • Hydrogen evolution reaction
  • Organic dye
  • Titanium dioxide
  • Visible-light-driven photocatalyst

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry

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