In this study, the physical properties of the Sr1-xPrxCo0.95Sn0.05O3-delta ceramics were measured and their potential for use as a cathode material of intermediate-temperature solid oxide fuel cells (IT-SOFCs) was evaluated. A cubic phase was retained in all of the Sr1-xPrxCo0.95Sn0.05O3-delta ceramics. Analysis of the temperature-dependent conductivity found the SrCo0.95Sn0.05O3-delta and Sr0.9Pr0.1Co0.95Sn0.05O3-delta ceramics exhibiting semiconductor-like behavior below 550 degrees C and metal-like behavior above the same temperature. The Sr0.8Pr0.2Co0.95Sn0.05O3-delta and Sr0.7Pr0.3Co0.95Sn0.05O3-delta ceramics, however, reported a metal-like conductivity in the whole temperature range. The electrical conductivities of the Sr0.8Pr0.2Co0.95Sn0.05O3-delta ceramic at 500 degrees C and 700 degrees C read respectively 1250 S/cm and 680 S/cm, both of which were superior than those in most of the common perovslcites. Single cells with a structure of NiO-Sm0.2Ce0.8O2-delta (SDC)/SDC/Sr0.8Pr0.2Co0.95Sn0.05O3-delta-SDC were built and characterized. Addition of SDC in Sr0.8Pr0.2Co0.95Sn0.05O3-delta emerged to be a crucial factor reducing the ohmic resistance (R-o) and polarization resistance (R-p) of the cell by facilitating a better adhesion to and electrical contact with the electrolyte layer. The R-o and R-p of the cell read respectively 0.068 0 cm(2) and 0.0571 Omega cm(2) at 700 degrees C and 0.298 Omega cm(2) and 1.310 Omega cm(2) at 550 degrees C. With no microstructure optimization and hermetic sealing of the cells, maximum power density (MPD) and open circuit voltage (OCV) reached respectively 0.872 W/cm(2) and 0.77 V at 700 degrees C and 0.482 W/cm(2) and 0.86 V at 550 degrees C. It is evident that Sr1-xPrxCo0.95Sn0.05O3-delta is a promising cathode material for IT-SOFCs. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.