Reaction model of dense Sm0.5Sr0.5CoO3 as SOFC cathode

H. Fukunaga, M. Koyama, N. Takahashi, C. Wen, K. Yamada

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    195 Citations (Scopus)


    Overpotential and AC impedance spectra were measured to study the reaction model of dense Sm0.5Sr0.5CoO3 (SSC) as SOFC cathode. From the PO(2) dependence of interfacial conductivity, the rate determining step of dense SSC electrode was adsorption and desorption processes at the surface of the electrode. Rate constants of adsorption and desorption were calculated from the interfacial conductivity of the dense electrode to be 3×10-5 mol cm-2 s-1 atm-1 and 2×10-8 mol cm-2 s-1, respectively. These were approximately one order of magnitude larger than the corresponding values calculated for La0.6Sr0.4CoO3. These rate constants can elucidate the overpotentials of porous electrodes.

    Original languageEnglish
    Pages (from-to)279-285
    Number of pages7
    JournalSolid State Ionics
    Issue number3
    Publication statusPublished - Jul 2 2000

    All Science Journal Classification (ASJC) codes

    • Chemistry(all)
    • Materials Science(all)
    • Condensed Matter Physics


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