Photovoltaic conversion using photosynthesis organ Grana from Spinach adsorbed nanocrystalline TiO
2 layer onto ITO glass (OTE) electrode (Grana/TiO
2 electrode) is developed. The shape of absorption spectrum of the Grana/TiO
2 electrode is almost the same that of Grana solution. Absorption maxima of Grana/TiO
2 electrode are observed at 450, 480 and 680 nm attributed to carotenoid and chlorophyll molecules. This result suggests that Grana are adsorbed onto nanocrystalline TiO
2 layer onto OTE. The photocurrent responses of Grana/TiO
2 electrodes are measured using acetonitrile with 0.1 mol dm
−3 tetrabutylammonium hexafluorophospate as a redox electrolyte in the presence and absence of water with 100 mWcm
−2 irradiation. Photocurrent of Grana/TiO
2 electrode increases using the redox electrolyte containing water. Moreover, the photocurrent responses of Grana/TiO
2 electrodes with monochromatic light (680 nm attributed to absorption band of photosystem II with oxygen evolved complex) irradiation are measured using acetonitrile with 0.1 mol dm
−3 tetrabutylammonium hexafluorophospate as a redox electrolyte in the presence and absence of water. Photocurrent of Grana/TiO
2 electrode using the redox electrolyte containing water only is observed, indicating that the evolved oxygen from water with photosystem II in Grana onto nanocrystalline TiO
2 layer electrode by 680 nm irradiation is reduced to water with catalytic activity of platinum electrode.
抄録全体を表示