Dye-modification effects on water splitting activity of GaN:ZnO photocatalyst

Hidehisa Hagiwara, Masakiyo Nagatomo, Chihiro Seto, Shintaro Ida, Tatsumi Ishihara

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    27 Citations (Scopus)


    Photocatalytic water splitting activities of GaN:ZnO modified with various porphyrins were investigated. Tetraphenylporphyrinato-chromium(III) chloride (Cr-TPPCl) showed the most positive effect on the photocatalytic activity of GaN:ZnO, and worked without decomposition in the photocatalytic water splitting for 24 h. Fluorescence spectra measurements revealed that photoluminescence intensity of GaN:ZnO was decreased by Cr-TPPCl modification and by loading RhOX and NiO cocatalysts. It suggests that charge or energy transfer occurs from GaN:ZnO to Cr-TPPCl and from Cr-TPPCl to RhOX-NiO cocatalysts. Fluorescence lifetime measurement showed electron transfer occurred from GaN:ZnO to Cr-TPPCl, and thus artificial photosynthetic water splitting was achieved on GaN:ZnO photocatalyst modified with various porphyrins under visible light. The apparent quantum efficiency of the dye-modified GaN:ZnO photocatalyst (RhOX (0.1 wt%), NiO (0.1 wt%)/Dye (0.5 wt%)/IrO 2 (0.1 wt%)-GaN:ZnO) was 2.73% at 410 nm.

    Original languageEnglish
    Pages (from-to)41-48
    Number of pages8
    JournalJournal of Photochemistry and Photobiology A: Chemistry
    Publication statusPublished - 2013

    All Science Journal Classification (ASJC) codes

    • General Chemistry
    • General Chemical Engineering
    • General Physics and Astronomy


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