Online ISSN : 2186-2451
Print ISSN : 1344-3542
ISSN-L : 1344-3542
Volume 76 , Issue 12
Showing 1-20 articles out of 20 articles from the selected issue
  • Tomio NAGANO, Yuzuru MIKAMI, Shokaku KIM, Kazuhiro CHIBA
    2008 Volume 76 Issue 12 Pages 874-879
    Published: December 05, 2008
    Released: March 22, 2012
    Anodic oxidation of a furan derivative was accomplished in cycloalkane-based thermomorphic (CBT) electrolyte solutions. In the CBT system, hydrophobic phase-tagged substrates were efficiently electrolyzed in the reversibly immixed mono-phasic state followed by on-cooling phase-separation of the tagged product as the cycloalkane solution separated from the polar electrolyte solutions. In the case of anodic oxidation of the phase-tagged furanyl compound, a 3,5-didocosyloxybenzyl tag that possessed higher oxidation potential and high hydrophobicity worked efficiently for achieving the selective anodic oxidation of the furanyl moiety. The electrolytic products were also successfully subjected to catalytic hydrogenation, which is generally difficult for solid-supported substrates. The product was separated from the CBT electrolyte solution simply by on-cooling phase separation.
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    2008 Volume 76 Issue 12 Pages 880-885
    Published: December 05, 2008
    Released: March 22, 2012
    Deterioration rate of a lithium-ion battery can be accelerated by the existence of an extra positive electrode (P2) where does’t face to the negative electrode. Therefore, the size of the positive electrode (P1) is designed smaller than the size of the negative electrode (N1) with a lithium-ion battery. However, the mechanism was not yet made clear. Eight reference electrodes were embedded around a cell which connected with P2 through an ammeter, and electrical potential behavior in a horizontal plane of the cell was studied against the nearest reference electrode. When the charge and discharge of the cell was performed, remarkable potential shifts occurred and the electricity charged from P1 to P2 was observed. Electric potential distributions in a horizontal plane of the cell were also analyzed with contour maps. Lithium ions must be supplied from P2 to N1 when the charge of the cell is performed and they must be also supplied from P2 to P1 when it discharges. The ion conduction resistance between P2 and P1 was estimated as 250 Ω.
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  • Kunihiko NAKAYAMA, Mitsuo SHIBUTANI, Masashi ISHIKAWA
    2008 Volume 76 Issue 12 Pages 886-890
    Published: December 05, 2008
    Released: March 22, 2012
    Alkaline polymer gel electrolytes mainly with modified polyvinyl alcohol (PVA) have been prepared for an electric double layer capacitor (EDLC). Their electrochemical characteristics were evaluated by impedance spectroscopy and constant-current charge/discharge measurement. The prepared gel electrolyte film with KOH exhibits excellent flexibility and an ionic conductivity of about 7×10−2 S cm−1 at 298 K. The gel electrolyte EDLC shows comparable discharge capacitance to that for EDLC containing a conventional aqueous electrolyte. These results suggest that the gel electrolyte based on the modified PVA is promising material for use in EDLC.
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  • Kazuhiro YAMADA, Shiro MATSUMOTO, Kana OSHIMA, Hayato NOGUCHI, Mitsuto ...
    2008 Volume 76 Issue 12 Pages 891-895
    Published: December 05, 2008
    Released: March 22, 2012
    A new pathway to germane-stannane copolymers is reported here. Diphenylgermyl dianion and methylphenylgermyl dianion were generated and accumulated in the cathode compartment of the two compartment cell by electrochemical reduction of diphenylgermane and methylphenylgermane, respectively, at −50°C in DMF using tetrabutylammonium tetrafluoroborate as a supporting electrolyte. These anions gave germane-stannane copolymers upon the reaction with dibutyldichlorostannanes. The obtained copolymers showed less sensitive characteristics toward the moisture compared to poly(dibutylstannane), and photodecomposition as sensitive as poly(dibutylstannane).
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