Preparation and Performance of Sm0.5Sr0.5CoOa-Ag Composite Cathode forIT-Solid Oxide Fuel Cell

摘要

Metal silver (Ag) was added into Sm0.5 Sr0.5CoO3(SSC) by nitrate pyrolysis method to obtain porous cathode material (SSC-Agx) for SOFC. Thecomposite phases in the se materials of SSC-Agx were identified by X-ray diffraction. The microstructure ofan electrode on Ce0.sSm0.2O1.9 intermediatetempera-ture electrolyte by spray method, polarization curveand the imperaturepedance spectra at low and intermediate (500-800℃) were investigated. The results show that the material containing 20% Ag exhibits the best electrochemical properties, its total impedance of cathode is only 1/11 of SSC at 600℃,and a quarter of SSCs at 750℃. The composite tech-nique of cathode Sm0.5Sr0.5CoO3 added with Ag is an efficient method to improve the cathode performance of SOFCs operating in the range of intermediate tempera-ture.