Influence of sulfur impurities on the stability of La0.6Sr 0.4Co0.2Fe0.8O3 cathode for solid oxide fuel cells

Jing Xie, Young Wan Ju, Tatsumi Ishihara

    研究成果: Contribution to journalArticle査読

    15 被引用数 (Scopus)

    抄録

    The initial degradation of a La0.6Sr0.4Fe 0.8Co0.2O3 (LSCF) cathode for solid oxide fuel cells (SOFCs) was investigated. Degradation of the cathodic performance at 973 K was accelerated by decreasing the oxygen partial pressure from 20 to 10% due to the reduction of Fe3 + in LSCF. Sulfur contamination (1513 and 752 ppm) in the LSCF powder significantly increased the IR loss of the cathode within the initial few hours of SOFC operation. Impedance and conductivity measurements suggested that the increase in IR loss could be explained by the decrease in the electrical conductivity of LSCF due to the phase separation of Sr2 + from lattice or surface segregation of Sr, and the formation of SrSO4. Sintering of the LSCF powder electrode was enhanced at the Sr enriched part and the diffusion overpotential was significantly increased after degradation for 24 h. Therefore, sulfur impurities in the LSCF powder have a negative influence on the stability of cathode during the initial period of SOFC operation.

    本文言語英語
    ページ(範囲)177-183
    ページ数7
    ジャーナルSolid State Ionics
    249-250
    DOI
    出版ステータス出版済み - 2013

    All Science Journal Classification (ASJC) codes

    • 化学 (全般)
    • 材料科学(全般)
    • 凝縮系物理学

    フィンガープリント

    「Influence of sulfur impurities on the stability of La<sub>0.6</sub>Sr <sub>0.4</sub>Co<sub>0.2</sub>Fe<sub>0.8</sub>O<sub>3</sub> cathode for solid oxide fuel cells」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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