Conduction Property of PbWO<sub>4</sub>- and PbMoO<sub>4</sub>-based Oxide Ion Conductors in Lower Oxygen Partial Pressures

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  • TAKAI Shigeomi
    Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University
  • SATOU Mako
    Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University
  • YOSHIDA Tatsuhiro
    Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University
  • CHIKASHIGE Naoki
    Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University
  • KITA Toshiyuki
    Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University
  • ESAKA Takao
    Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University

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  • Conduction property of PbWO4- and PbMoO4-based oxide ion conductors in lower oxygen partial pressures

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Description

Electric conductivities of PbWO4- and PbMoO4-based oxide ion conductors have been measured in the reducing atmospheres to investigate the transport properties and to evaluate the applicability to the solid electrolytes of fuel cells. Although almost all the solid solutions showed conductivity enhancements due to appearance of n-type electronic conduction with decreasing PO<sub>2</sub> down to 10−12 atm, pure oxide ion conduction was maintained in the measured PO<sub>2</sub> range of ∼10−18 atm at 900°C only for Pb1−xLaxWO4+x/2 system. For the tungstate and molybdate mixed crystal systems, furthermore, electronic contribution appears at higher PO<sub>2</sub> with increasing molybdenum content. Comparing the two types of substitutions, i.e. Pb1−xLaxMO4+x/2 and Pb1−xLa2x/3MO4 systems (M=W, Mo and mixed one), the former system tended to keep oxide ions in lattice rather than the latter, whereas the former contains excess oxide ions at the interstitial sites. At the end of this paper, test fuel cells have been constructed using Pb1−xLaxWO4+x/2 solid electrolyte and operated at 500°C employing wet CH4 gas as the fuel.

Journal

  • Electrochemistry

    Electrochemistry 79 (9), 696-700, 2011

    The Electrochemical Society of Japan

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