Ni/YSZ electrode degradation studied by impedance spectroscopy — Effect of p(H2O)

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    Abstract

    Anode supported solid oxide fuel cells have been tested and the degradation over time was monitored and analyzed by impedance spectroscopy. Reproducibility of initial cathode, anode and electrolyte performance was obtained. Anode (Ni/YSZ) degradation was analyzed for tests applying p(H2O) of 0.2 atm, 0.4 atm and 0.6 atm at 750 °C and 0.75 A/cm2. The anode degradation could be well described by the equation: RNi,TPB(t) = RNi,0 + ΔR∙(1 − exp(− t / τ)). The initial resistance and total increase for the Ni–YSZ charge transfer resistance, RNi,0 and ΔR, were similar for all tests (i.e. not directly correlated with p(H2O)), but the characteristic time, τ, for the anode degradation was significantly higher for the test at p(H2O) = 0.2 atm than at p(H2O) of 0.4 atm and 0.6 atm.
    Original languageEnglish
    JournalSolid State Ionics
    Volume192
    Issue number1
    Pages (from-to)547-551
    ISSN0167-2738
    DOIs
    Publication statusPublished - 2011

    Keywords

    • Solid Oxide Fuel Cells
    • Fuel Cells and hydrogen

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