Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
ISSN-L : 1344-3542
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Volume 79, Issue 4
Displaying 1-15 of 15 articles from this issue
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Preface
Communications
  • Conductivity Evaluation of Rutile-Type Ti1-xNbxO2 as Interconnect Material for Low Temperature Solid Oxide Fuel Cells
    Hideo MICHIBATA, Koichi ITOH, Akifusa HAGIWARA, Tatsuya KAWADA, unichi ...
    2011 Volume 79 Issue 4 Pages 246-248
    Published: April 05, 2011
    Released on J-STAGE: March 30, 2012
    DOIhttps://doi.org/10.5796/electrochemistry.79.246
    JOURNAL FREE ACCESS
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    Rutile-type Ti0.93Nb0.07O2 was characterized and evaluated as a potential interconnect material for low temperature solid oxide fuel cells. It was revealed that Ti0.93Nb0.07O2 shows the conductivity of ca. 50 S/cm in reducing atmospheres over a wide temperature range of 400∼1000°C. Also, the effect of Cr-doping on conductivity and the segregation of niobium on grain boundaries was investigated. It was found that Cr-doping to rutile-type Ti0.93Nb0.07O2 is effective in improving the initial conductivity and reducing the rate of conductivity degradation upon aging in air.
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  • Electrodeposition of Pd-Ni-P Metallic Glass Films
    Chihiro MOCHIZUKI, Takashi SENGA, Masami SHIBATA
    2011 Volume 79 Issue 4 Pages 249-251
    Published: April 05, 2011
    Released on J-STAGE: March 30, 2012
    DOIhttps://doi.org/10.5796/electrochemistry.79.249
    JOURNAL FREE ACCESS
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    In the present study, the electrodeposition of Pd-Ni-P metallic glass films has been investigated. The composition of the electrodeposited Pd-Ni-P films were controlled by adjusting the current density from 0.2 A dm−2 to 2.5 A dm−2. The results of DSC analysis demonstrated that the electrodeposited Pd-Ni-P films were metallic glass. The composition of the electrodeposited Pd-Ni-P films at 2.5 A dm−2 was close to bulk metallic glass. The Tg and Tx of electrodeposited films were in good agreement with bulk metallic glass. The electrodeposition is able to fabricate the Pd-Ni-P metallic glass, which is close to bulk metallic glass.
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  • Preparation of Porous La(Sr)Ti(Fe)O3 Perovskite Oxide Tube by Filament-Winding Method
    Akihiro KAWAHARA, Yousuke TAKAHASHI, Yuji HIRANO, Masayoshi HIRANO, Ta ...
    2011 Volume 79 Issue 4 Pages 252-255
    Published: April 05, 2011
    Released on J-STAGE: March 30, 2012
    DOIhttps://doi.org/10.5796/electrochemistry.79.252
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    Porous ceramic tubes consisting of La0.7Sr0.3Ti0.7Fe0.3O3 (LSTF) perovskite oxide was investigated in this study by using Filament-Winding (FW) method. When methacrylic acid with molecular weight of 50000 was used for organic binder, LSTF fiber with 0.5 mm in diameter and 15 m in length can be obtained by extrusion method. Although the mechanical strength of the obtained LSTF fiber was lower than that of the polymer fiber used for FW method, the obtained LSTF fiber showed reasonably large strength and expand ratio. As a result, LSTF porous tube can be obtained by FW method and calcination at 1673 K. Comparing with the porous tube prepared by a conventional sintering method, it was found that the obtained LSTF tube showed much larger porosity (ca. 80%) and large air permeation rate.
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Article
  • Surface X-ray Scattering of Pd(111) and Pd(100) Electrodes during the Oxygen Reduction Reaction
    Keita NAITO, Masashi NAKAMURA, Osami SAKATA, Nagahiro HOSHI
    2011 Volume 79 Issue 4 Pages 256-260
    Published: April 05, 2011
    Released on J-STAGE: March 30, 2012
    DOIhttps://doi.org/10.5796/electrochemistry.79.256
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    Surface structures of Pd(111) and Pd(100) electrodes have been determined at 0.50 V (RHE) in 0.1 M HClO4 saturated with Ar or O2 using surface X-ray scattering (SXS). Both surfaces have unreconstructed (1×1) in-plane structure. The surface layers on Pd(111) do not relax in Ar saturated solution: the interlayer spacing between the first and the second layers d12 agrees with that of the bulk. In O2 saturated solution, the value of d12 is expanded by 1.8% on Pd(111), whereas the value of d23 (interlayer spacing between the second and third layers) is the same as that of the bulk. No relaxation is also observed on Pd(100) in Ar saturated solution. In O2 saturated solution, however, d23 as well as d12 is expanded by 5.7% on Pd(100).
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