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    Volume 44, Issue 4 (July 2016)

    Terbium-Doped SrCoO3 as a New Cathode Material for IT–SOFC

    (Received 23 December 2014; accepted 1 July 2015)

    Published Online: 2016

    CODEN: JTEVAB

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    Abstract

    Cathode materials consisting of Sr1–xTbxCoO3–δ (x = 0.1, 0.2, 0.3) were prepared from a stoichiometric mixture of SrCO3, Co3O4, and Tb4O7 for intermediate-temperature solid oxide fuel cells (IT–SOFCs). The crystal structure of Sr0.9Tb0.1CoO3–δ was defined in the cubic Pm–3 m space group (No. 221), and Sr0.8Tb0.2CoO3–δ and Sr0.7Tb0.3CoO3–δ had a tetragonal I4/mmm structure. The electrical conductivity values were all higher than 407 S · cm−1 for T ≥ 500°C. The area specific resistances (ASRs) and its activation energy (Ea) increased with increasing x. The oxygen vacancies and the thermal expansion coefficients (TECs) decreased with increasing x. The TECs were influenced by the concentration of oxygen vacancies and the transition of the Co3+ ions from a low-spin to a high-spin state. The cathodes exhibited porosity microstructure and good adhesion to solid electrolyte. Sr0.9Tb0.1CoO3–δ had the best cathode characteristics and the most stable performance.


    Author Information:

    Ma, Pengcheng
    School of Materials and Metallurgy, Northeastern Univ., Shenyang,

    Liu, Tao
    School of Materials and Metallurgy, Northeastern Univ., Shenyang,

    Yu, Jingkun
    School of Materials and Metallurgy, Northeastern Univ., Shenyang,


    Stock #: JTE20140536

    ISSN:0090-3973

    DOI: 10.1520/JTE20140536

    Author
    Title Terbium-Doped SrCoO3 as a New Cathode Material for IT–SOFC
    Symposium ,
    Committee C28