Ba1-xPrxCo1-yFeyO3-delta (BPCF) perovskite oxides have been synthesized and investigated as cathode materials for low temperature solid oxide fuel cells (LT-SOFCs). Compared with those of Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) and Sm0.5Sr0.5CoO3 (SSCo) cathode materials. BPCF has a lower polarization resistance at decreased temperatures. In particular, Ba0.5Pr0.5Co0.8Fe0.2O3-delta showed the lowest polarization loss among the different compositions as a cathode material for LT-SOFCs. The area specific resistance (ASR) of Ba0.5Pr0.5Co0.8Fe0.2O3-delta as a cathode material is 0.70 and 0.185 Omega cm(2) at 500 degrees C and 550 degrees C, respectively. The maximum power density of the cell BPCF/SDC/Ni-SDC with humidified hydrogen as fuel and air as oxidant reaches 860 mW cm(-2) at 650 degrees C. Crown Copyright (C) 2010 Published by Elsevier Ltd. All rights reserved.