La(0.3)Sr(0.7)FeO(3-delta) (LSF)/CeO(2) cathode supported Ce(0.8)SM(0.2)O(2-delta) (SDC) electrolyte was prepared by a simple multilayer tape casting and co-firing method. SDC electrolyte slurry and LSF/CeO(2) cathode slurry were optimized and the green bi-layer tapes were co-fired at different temperature. Phase characterizations and microstructures of electrolyte and cathode were studied by X-ray diffraction (XRD) and Scan Electronic Microscopy (SEM). No additional phase peak line was observed in electrolyte and cathode support when the sintering temperature lower was than 1400 degrees C. The electrolytes were extremely dense with the thickness of about 20 pm. The cathode support was porous with electrical conductivity of about 4.21 S/cm at 750 degrees C. With Ni/SDC as anode, Open Current Voltage and maximum power density reached 0.61 V and 233 MW cm(-2) at 750 degrees C, respectively. (C) 2009 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.