A major research goal on solid oxide fuel cells (SOFCs) is to develop cost-effective component materials for operation temperatures below 800ºC. Toward this goal, La 0.6 Ca 0.4 Fe 0.8 Ni 0.2 O 3-δ (LCFN) phase with perovskite-type structure was obtained by a liquid mix method. The product was characterized by X-ray diffraction and an orthorhombic structure (Pnma) was found. The particle size was studied by scanning electron microscopy obtaining a mean particle size less than 300 nm. The polarization resistance was studied using two different electrolytes: Y-doped zirconia (YSZ) and Sm-doped ceria (SDC). Chemical reactivity of the LCFN and the electrolytes was studied. Electrochemical Impedance Spectroscopy measurements of LCFN/YSZ/LCFN and LCFN/SDC/LCFN test cells were conducted. These electrochemical experiments were performed at equilibrium from room temperature up to 850°C, under zero dc current intensity and under air. The obtained ASR values at 700°C for the SDC and YSZ cell tests were 3.23 Ω·cm 2 and 85.87 Ω·cm 2 , respectively.
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