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 journalArticle

19 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

Fingerprint

water splitting
photosynthesis
Photosynthesis
Porphyrins
polarization (charge separation)
Photocatalysts
porphyrins
Water
Photoexcitation
decay
room temperature
photoexcitation
electronics
excitation
Paramagnetic resonance
Charge transfer
Absorption spectra
Fluorescence
charge transfer
injection

All Science Journal Classification (ASJC) codes

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

Cite this

Long-time charge separation in porphyrin/KTa(Zr)O 3 as water splitting photocatalyst. / Hagiwara, Hidehisa; Inoue, Takanori; Ida, Shintaro; Ishihara, Tatsumi.

In: Physical Chemistry Chemical Physics, Vol. 13, No. 40, 28.10.2011, p. 18031-18037.

Research output: Contribution to journalArticle

Hagiwara, Hidehisa ; Inoue, Takanori ; Ida, Shintaro ; Ishihara, Tatsumi. / Long-time charge separation in porphyrin/KTa(Zr)O 3 as water splitting photocatalyst. In: Physical Chemistry Chemical Physics. 2011 ; Vol. 13, No. 40. pp. 18031-18037.
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