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Structural and electrochemical characterization of Ce0.85Ca0.05Sm0.1O1.9 oxide ion electrolyte with Sr-doped LaMnO3 and SmCoO3 cathodes

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Abstract

This paper reports on the electrochemical properties and chemical stability of a recently developed Ca2+ and Sm3+-doped oxide ion conducting electrolyte, Ce0.85Ca0.05Sm0.1O1.9 (CCS), employed in an intermediate temperature solid oxide fuel cell (IT-SOFC) using conventional Sm0.5Sr0.5CoO3 (SSC) and La0.8Sr0.2MnO3 (LSM) cathodes in air at elevated temperatures. The materials were prepared by conventional solid-state reactions using their corresponding metal oxides and salts in the temperature range of 1,200–1,450 °C in air. Powder X-ray diffraction (PXRD) and impedance spectroscopy were employed for phase formation, chemical compatibility, and electrochemical characterization. PXRD studies on 1:1 weight ratio of heat-treated (1,000 °C for 3 days) mixtures of SSC or LSM and CCS revealed the presence of fluorite-type and perovskite-like phases. The area-specific resistance (ASR) value in air was lower for SSC cathodes (4.3–0.15 Ω cm2) compared to those of LSM (407–11 Ω cm2) over the investigated temperature range of 600–800 °C. As expected, a significant increase in ASR was observed in Ar as compared to air.

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Acknowledgment

We thank the Natural Sciences and Engineering Research Council (NSERC) of Canada and the Canada Foundation for Innovation (CFI) for their financial support. We also acknowledge the University of Calgary for financial support through the start-up grant and University Research Grants Committee (URGC) research grant.

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  1. Department of Chemistry, The University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada, T2N 1N4

    M. C. Pearce & V. Thangadurai

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  1. M. C. Pearce
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  2. V. Thangadurai
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Correspondence to V. Thangadurai.

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Pearce, M.C., Thangadurai, V. Structural and electrochemical characterization of Ce0.85Ca0.05Sm0.1O1.9 oxide ion electrolyte with Sr-doped LaMnO3 and SmCoO3 cathodes. Ionics 14, 483–489 (2008). https://doi.org/10.1007/s11581-008-0240-1

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  • DOI: https://doi.org/10.1007/s11581-008-0240-1

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