Long-time charge separation in porphyrin/KTa(Zr)O3 as water splitting photocatalyst

Hidehisa Hagiwara; Takanori Inoue; Shintaro Ida; Tatsumi Ishihara

doi:10.1039/C1CP22425E

Long-time charge separation in porphyrin/KTa(Zr)O₃ as water splitting photocatalyst

Hidehisa Hagiwara,*^ab Takanori Inoue,^c Shintaro Ida^ab and Tatsumi Ishihara^ab

* Corresponding authors

^a Department of Applied Chemistry, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 8190395, Japan
E-mail: h.hagiwara@cstf.kyushu-u.ac.jp
Fax: (+81) 92-802-2871

^b International Institute for Carbon-Neutral Energy Research (I2CNER), 744 Motooka, Nishi-ku, Fukuoka 8190395, Japan

^c Department of Applied Chemistry, Oita University, Dannoharu 700, Oita 8701192, Japan

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 KTaO₃ (KTa(Zr)O₃) 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)O₃ 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)O₃ 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)O₃. The formed reduced state of Cr-TPPCl was highly stable and was detected by static ESR measurements.

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DOI: https://doi.org/10.1039/C1CP22425E
Article type: Paper
Submitted: 27 Jul 2011
Accepted: 19 Aug 2011
First published: 15 Sep 2011

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Phys. Chem. Chem. Phys., 2011,13, 18031-18037

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Long-time charge separation in porphyrin/KTa(Zr)O₃ as water splitting photocatalyst

H. Hagiwara, T. Inoue, S. Ida and T. Ishihara, Phys. Chem. Chem. Phys., 2011, 13, 18031 DOI: 10.1039/C1CP22425E

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Physical Chemistry Chemical Physics

Long-time charge separation in porphyrin/KTa(Zr)O₃ as water splitting photocatalyst

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Long-time charge separation in porphyrin/KTa(Zr)O₃ as water splitting photocatalyst

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