Abstract
Symmetric cells consisting of the LaNi0.6Fe0.4O3 (LNF)- Sm0.2Ce0.8O1.9 (SDC) composite cathodes and 8 mol%Y2O3- stabilized ZrO2 (YSZ) electrolyte have been investigated in order to evaluate the oxygen reduction performance of the composite cathode by AC impedance analysis. Cell performance and cathodic overvoltage were examined for cells consisting of the Ni-YSZ cermet anode, YSZ electrolyte, and composite cathode. The addition of 50 wt% SDC to LNF resulted in the lowest polarization resistance. A cell using the 50 wt% LNF + 50 wt% SDC composite cathode showed the maximum power density and the cathodic overvoltage for this cell showed as half as lower than that for a cell using the LNF cathode under the same condition. Enhancement of the electrochemical performance in the LNF-SDC composite cathode is most likely to be caused by the SDC particles connecting LNF particles with the electrolyte surface.
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