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Journal of the Electrochemical Society, Vol.159, No.6, B666-B669, 2012
Stability and Performance of Solid Oxide Fuel Cells with Nanocomposite Electrodes
The long term performance of SOFC with nanocomposite Ni-YSZ anode and LSM-YSZ cathode was reported. The SOFC was prepared by infiltrating polymeric precursors of NiO and LSM from anode and cathode sides respectively. The fuel cell showed relatively high initial performance (0.49 Watt/cm(2) at 800 degrees C) for the given electrolyte thickness (similar to 170 mu m). Long term stability tests showed that the power density dropped to 0.41 Watt/cm(2) in the first 60 hours of operation in short circuit conditions and no further change in the power density was observed. Low electrode polarization resistance was obtained (similar to 0.080 Ohm.cm(2) for combined anode and cathode at 800 degrees C) which showed no significant change with prolonged time. The slight drop in power density was related to the change in ohmic resistance which was attributed to the increase in current collection resistance. The fact that the majority of the resistance was due to the electrolyte resistance (similar to 80%) suggests that stable SOFCs with high power densities could be achieved with thinner electrolytes. After > 100 hours of operation at 800 degrees C in short circuit conditions, the fuel cell was measured at higher temperatures. Power densities were 0.71 Watt/cm(2) and 1.0 Watt/cm(2) at 900 degrees C and 1000 degrees C, respectively. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.050206jes] All rights reserved.