Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
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77 巻 , 10 号
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  • Yutaka AMAO, Ayumi KUROKI
    77 巻 (2009) 10 号 p. 862-864
    公開日: 2012/03/22
    ジャーナル オープンアクセス
    Photovoltaic conversion using photosynthesis organ Grana from Spinach adsorbed nanocrystalline TiO2 layer onto ITO glass (OTE) electrode (Grana/TiO2 electrode) is developed. The shape of absorption spectrum of the Grana/TiO2 electrode is almost the same that of Grana solution. Absorption maxima of Grana/TiO2 electrode are observed at 450, 480 and 680 nm attributed to carotenoid and chlorophyll molecules. This result suggests that Grana are adsorbed onto nanocrystalline TiO2 layer onto OTE. The photocurrent responses of Grana/TiO2 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/TiO2 electrode increases using the redox electrolyte containing water. Moreover, the photocurrent responses of Grana/TiO2 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/TiO2 electrode using the redox electrolyte containing water only is observed, indicating that the evolved oxygen from water with photosystem II in Grana onto nanocrystalline TiO2 layer electrode by 680 nm irradiation is reduced to water with catalytic activity of platinum electrode.
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  • Kazuo TOMIDA, Nagao HISATOME, Tatsuo KABATA, Hiroshi TSUKUDA, Yohtaro ...
    77 巻 (2009) 10 号 p. 865-875
    公開日: 2012/03/22
    ジャーナル オープンアクセス
    To improve the segmented-in-series tubular SOFC performance operating at 1173 K, we studied cathode interlayer (CIL) and a structural modification of the cell stack using a performance simulation. As the result of changing CIL into (Ce0.8Sm0.2)O2 (SDC20) (type 2) from La0.7Sr0.3MnO3-YSZ (type 1), ohmic polarization (ηIR) and activation/concentration polarizations (ηAC) of type 2 decreased 16% and 47% than those of type 1, respectively. Next, based on the simulation results of ηIR, a tubular SOFC (type 4) with structural modification in the length ratio of the effective generation part (EGP) and interconnector part (ICP) was fabricated by applying SDC20 to CIL. Ohmic polarization of type 4 decreased 52% than that of type 2, while ηAC increased 63%. However, the generation performance of type 4 improved than that of type 2, since ηIR decreased more than the increase of ηAC. In a pressurized test of type 4, an increase of pressure resulted in a decrease of the area specific resistance calculated from the inclination of I-V characteristics including EGP and ICP resistances. In a durability test of type 4 conducted for 7000 h in atmospheric pressure, a degradation rate of 0.73% 1000 h−1 was obtained.
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