The electrochemical characterization and performance evaluation of using La0.75Sr0.25CuO2.5-delta; (LSCu) as cathode material for intermediate temperature solid oxide fuel cell (IT-SOFC) were presented. The cell performance measurement was conducted on the Ni-YSZ anode supported single cell using the yittria-stabilized zirconia (YSZ) thin film (∼ 8 μm) as electrolyte, and porous LSCu layer as cathode (∼ 80 μm). For a fuel cell application, the area-specific resistance (ASR) of this cell operating at 750° and 700°C was too high to provide effective power density. Due to the increase of the ohmic resistance of the YSZ electrolyte and the polarization resistance on the electrode/electrolyte interface, the performance of the single cell decreased with decreasing operating temperature. For the performance testing carried out by anode supported single cell, the maximum cell power densities obtained were 0.65, 0.40, and 0.28 w/sq cm at 800°, 750°, and 700°C, respectively. The ASR of the cell were 0.32, 0.75, and 1.21 Ω sq cm at 800°, 750°, and 700°C, respectively. These values agreed well with the polarization resistance analyzed by AC-impedance spectroscopy after passing a 200 mA/sq cm of current for 30 min.
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