Powders of Gd0.8Sr0.2CoO3 (GSC) were prepared by a glycine-nitrate process. Symmetrical cathodes of GSC-50Ce(0.9)Gd(0.1)O(1.95) (GDC) (50:50 by volume) powders were deposited on GDC electrolyte pellets, and the electrochemical properties of the interfaces between the porous cathode and the electrolyte were investigated at intermediate temperature (500-750 degrees C) using electrochemical impedance spectroscopy. The addition of 50 vol.% GDC to GSC resulted in an additional factor approximate to 3 decrease in the area-specific resistance (ASR). The ASR values for the GSC-50GDC cathodes were as low as 0.064 Omega cm(2) at 700 degrees C and 0.16 Omega cm(2) at 600 degrees C, respectively. The maximum power density of a cell using the GSC-50GDC cathode was 356 mW cm(-2) at 700 degrees C. (c) 2007 Elsevier B.V. All rights reserved.