NDLI: Artificial photosynthesis by using chloroplasts from spinach adsorbed on a nanocrystalline TiO$_{2}$ electrode for photovoltaic conversion

Content Provider	Springer Nature Link
Author	Amao, Yutaka Tadokoro, Akemi Nakamura, Miki Shuto, Naho Kuroki, Ayumi
Copyright Year	2014
Abstract	Photovoltaic conversion has been achieved by use of chloroplasts (photosynthetic organs) from spinach adsorbed on a nanocrystalline TiO$_{2}$ film on an indium tin oxide (ITO) glass electrode (chloroplast/TiO$_{2}$ electrode). The shape of the absorption spectrum of the chloroplast/TiO$_{2}$ electrode is almost the same that of a dispersion of the chloroplasts. Absorption maxima of the chloroplast/TiO$_{2}$ electrode observed at 430, 475, and 670 nm were attributed to carotenoid and chlorophyll molecules, suggesting that chloroplasts have been adsorbed by the nanocrystalline TiO$_{2}$ film on the ITO electrode. The photocurrent responses of chloroplast/TiO$_{2}$ electrodes were measured by using a solution of 0.1 M tetrabutylammonium hexafluorophosphate in acetonitrile as redox electrolyte in the presence or absence of water and 100 mW cm$^{−2}$ irradiation. The photocurrent of the chloroplast/TiO$_{2}$ electrode was increased by adding water to the redox electrolyte. The photocurrent responses of chloroplast/TiO$_{2}$ electrodes irradiated with monochromatic light (680 nm, the absorption band of photosystem II complexed with evolved oxygen) were measured by use of a solution of 0.1 M tetrabutylammonium hexafluorophosphate in acetonitrile as redox electrolyte in the presence or absence of water. A chloroplast/TiO$_{2}$ electrode photocurrent was observed only when the redox electrolyte containing water was used, indicating that the oxygen evolved from water by photosystem II in chloroplasts adsorbed by a nanocrystalline TiO$_{2}$ film on an ITO electrode irradiated at 680 nm is reduced to water by the catalytic activity of the platinum electrode. The maximum incident photon-to-current conversion efficiency (IPCE) was 0.8 % on irradiation at 670 nm.
Starting Page	3257
Ending Page	3265
Page Count	9
File Format	PDF
ISSN	09226168
Journal	Research on Chemical Intermediates
Volume Number	40
Issue Number	9
e-ISSN	15685675
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-10-15
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Artificial photosynthesis Chloroplast Photosynthetic organ Photovoltaic conversion device Biofuel cell Catalysis Physical Chemistry Inorganic Chemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry

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