Ln1−xSrxCoO3(Ln = Sm, Dy) for the electrode of solid oxide fuel cells |
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Authors: | H Y Tu Y Takeda N Imanishi and O Yamamoto |
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Institution: | Department of Chemistry, Faculty of Engineering, Mie University, Tsu, Mie 514, Japan |
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Abstract: | The perovskite-type oxides were synthesized in the series of Ln1?xSrxCoO3(Ln = Sm, Dy). The formation of solid solutions in Dy1 ? xSrxCoO3 was limited, compared with that in Sm1 ? xSrxCoO3. The electrical conductivities of the sintered samples were measured as a function of x in the temperature range 30 to 1000 °C. The highest conductivity of around 500 S/cm at 1000 °C was found in Sm0.7Sr0.3CoO3. The reactivity of all the samples with YSZ was examined at 800–1000 °C for 96 h. The Sr-doped perovskite oxides were more reactive with YSZ and produced SrZrO3 at 900 °C after 96 h. However, no reaction product between SmCoO3 and YSZ was observed at 1000 °C for 96 h. The cathodic polarization of the oxide electrodes, sputtered on yttria stabilized zirconia (YSZ), was studied at 800–1000 °C in air. SmCoO3 shows no degradation of the electrode performance at higher temperatures. The thermal expansion measurements on the sintered samples were carried out from room temperature to 1000 °C. Large thermal expansion coefficients were found in these samples. |
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Keywords: | Solid oxide fuel cell Perovskite Cathode Overpotential Cathodic polarization |
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