期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 13, 期 40, 页码 18031-18037出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1cp22425e
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资金
- Kyushu University
- KAKENHI [22860047]
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)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.
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