Electrochemical performance of Pr0.7Sr0.3Co0.9Cu0.1O3-δ-Ce0.8Sm0.2O1.9 composite cathodes in intermediate-temperature solid oxide fuel cells

2008 
Abstract The electrochemical performance of Pr 0.7 Sr 0.3 Co 0.9 Cu 0.1 O 3− δ – x Ce 0.8 Sm 0.2 O 1.9 (PSCC– x SDC, x  = 0–40 wt%) composite cathodes has been investigated for their potential utilization in intermediate-temperature solid oxide fuel cells (SOFCs). The results showed that the addition of SDC to PSCC improved remarkably the electrochemical performance of a PSCC cathode, and that a PSCC–35SDC cathode exhibited the best electrochemical performance in the PSCC– x SDC system. When SDC was used as the electrolyte, the interfacial resistance was smallest for 35 wt% SDC, where the value was 0.137 Ω cm 2 at 700 °C and 0.062 Ω cm 2 at 750 °C, much lower than the corresponding interfacial resistance for pure PSCC. At 700 °C, the cathodic overpotential of the PSCC–35SDC cathode in the SDC electrolyte was 70 mV at a current density of 0.5 A cm2 . This is a factor of two lower than that for a pure PSCC cathode (152 mV at 700 °C) under the same current conditions. The maximum power density of a single-cell using PSCC–35SDC as the cathode was 388 and 615 mW cm2 at 650 and 700 °C, respectively.
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