Electrochemical performance and stability of the cathode for solid oxide fuel cells: V. high performance and stable Pr2NiO4 as the cathode for solid oxide fuel cells

X. D. Zhou, J. W. Templeton, Z. Nie, H. Chen, J. W. Stevenson, L. R. Pederson

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    48 Citations (Scopus)

    Abstract

    The polarization loss due to oxygen reduction at the cathode in solid oxide fuel cells is a thermally activated process; therefore, as temperature is lowered, the loss becomes substantial. Highly active cathodes have been investigated by several groups; equally important, if not more, is the stability of these electrodes. The high performance and stable Pr2NiO 4 cathode was studied by impedance spectroscopy and dc current-potential sweeping methods. The power density in Pr2NiO 4-based anode supported button cells was in the range between 0.65 and 0.7 W/cm2 at 750 ° C at the external load of 0.8 V. The degradation rate at 0.8 V was approximately 3% per 1000 h up to 2000 h. The electrode resistance is a function of external loads, thus also varies with current densities. The relationship between electrode resistance and external loads is non-linear, which may changes in lattice oxygen nonstoichiometry of the cathodes.

    Original languageEnglish
    Pages (from-to)44-49
    Number of pages6
    JournalElectrochimica Acta
    Volume71
    DOIs
    Publication statusPublished - 1 Jun 2012

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    Keywords

    • Cathode
    • Impedance
    • Performance
    • Solid oxide fuel cells
    • Stability

    ASJC Scopus subject areas

    • Chemical Engineering(all)
    • Electrochemistry

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