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    Effect of Sm3+ content on the properties and electrochemical performance of SmxSr1 − xCoO3 − δ (0.2 ≤ x ≤ 0.8) as an oxygen reduction electrodes on doped ceria electrolytes

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    Fulltext not available
    Authors
    Guo, Y.
    Chen, D.
    Shi, H.
    Ran, R.
    Shao, Zongping
    Date
    2011
    Type
    Journal Article
    
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    Citation
    Guo, Y. and Chen, D. and Shi, H. and Ran, R. and Shao, Z. 2011. Effect of Sm3+ content on the properties and electrochemical performance of SmxSr1 − xCoO3 − δ (0.2 ≤ x ≤ 0.8) as an oxygen reduction electrodes on doped ceria electrolytes. Electrochimica Acta. 56 (7): pp. 2870-2876.
    Source Title
    Electrochimica Acta
    DOI
    10.1016/j.electacta.2010.12.075
    ISSN
    0013-4686
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/21316
    Collection
    • Curtin Research Publications
    Abstract

    SmxSr1 − xCoO3 − δ (SSCx) materials are promising cathodes for IT-SOFCs. The influence of Sm content in SSCx (0.2 ≤ x ≤ 0.8) oxides on their oxygen nonstoichiometry, oxygen desorption, thermal expansion behavior, electrical conductivity and electrochemical activity for oxygen reduction is systematically studied by iodometric titration, oxygen-temperature programmed desorption (O2-TPD), dilatometer, four-probe DC conductivity, electrochemical impedance spectroscopy (EIS) and three-electrode polarization test, respectively. Iodometric titration experiments demonstrate that the electrical charge neutrality compensation in SSCx proceeds preferably through the oxidation of cobalt ion for high Sm3+ contents (x ≥ 0.6). However, it proceeds mainly through the creation of oxygen vacancies at x ≤ 0.5. O2-TPD shows SSC5 possesses the highest oxygen desorption ability among the range of SSCx materials tested. The thermal expansion coefficients (TECs) are high between the transition temperature and 900 °C, showing values typically larger than 20 × 10−6 K−1. All dense materials show high electrical conductivity with a maximum value of ∼1885 S cm−1 for SSC6 in air, while SSC5 has the highest electrical conductivity in nitrogen. EIS analysis of porous electrodes demonstrates that SSC5 has the lowest area specific resistance (ASR) value (0.42 Ω cm2) at 600 °C. Cathodic overpotential testing demonstrates that SSC5 also has the largest exchange current density of 60 mA cm−2 at 600 °C in air.

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