Long-time charge separation in porphyrin/KTa(Zr)O 3 as water splitting photocatalyst

Hidehisa Hagiwara, Takanori Inoue, Shintaro Ida, Tatsumi Ishihara

    Research output: Contribution to journalArticlepeer-review

    20 Citations (Scopus)

    Abstract

    Artificial photosynthesis is one of the chemists' dreams and the separation of charges with long lives is fundamental for achieving artificial photosynthesis. In actual photosynthesis, Z-scheme excitation separates electronic charge with high efficiency using solar light. Here we report that photo-excitation in Cr-tetraphenylporphyrin chroride (Cr-TPPCl)/Zr doped KTaO 3 (KTa(Zr)O 3) is analogous to the Z-scheme in photosynthesis, and that we achieve complete charge separation at room temperature. Photovoltaic decay and transient fluorescence spectra measurements showed that the photo-excited charge in KTa(Zr)O 3 transferred to the HOMO of Cr-TPPCl within a few hundred pico-seconds on charge transfer. In contrast, the reduced state of the Cr-TPPCl species that was formed by the electronic injection from KTa(Zr)O 3 was observed for more than 0.5 s at room temperature in the transient decay of the absorption spectra change after the initial excitation of KTa(Zr)O 3. The formed reduced state of Cr-TPPCl was highly stable and was detected by static ESR measurements.

    Original languageEnglish
    Pages (from-to)18031-18037
    Number of pages7
    JournalPhysical Chemistry Chemical Physics
    Volume13
    Issue number40
    DOIs
    Publication statusPublished - Oct 28 2011

    All Science Journal Classification (ASJC) codes

    • Physics and Astronomy(all)
    • Physical and Theoretical Chemistry

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