Preparation and Characterization of LSF-based Composite Anodes for Solid Oxide Electrolysis Cell

Sr-doped LaFeO3 (LSF) based composite anodes of solid oxide electrolysis cell (SOEC) were prepared by screen printing and ion impregnating respectively. XRD, TEM and SEM were used to analyze the phases and microstructures of the powders and the composites. In addition, anodic polarization tests and electrochemical impedance spectra (EIS) analysis were used to study their electrochemical properties at 800 hich was the working temperature of SOEC. The results show that the grain size of LSF20 (La0.8Sr0.2FeO3-δ) powder prepared by coprecipitation-azeotropic distillation (CP-AD) method is in the range of 20-30nm. The LSF powders spread on the surface of yttria-stabilized zirconia (YSZ) ceramic skeleton. The anodic polarization current densities of LSF20-YSZ composite anodes prepared by ion impregnating method are 0.38-0.49A/cm2 under 0.1V overpotential at 800 which is almost 2-2.5 times as much as that of screen printing process.