PrBa0.5Sr0.5Co2O5+x (PBSC) oxides have been evaluated as cathode materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs) with Ce0.9Gd0.1O1.95 (GDC) and La0.9Sr0.1Ga0.8Mg0.2O3-delta (LSGM) as electrolytes. XRD results show that PBSC cathode is chemically compatible with the intermediate-temperature electrolyte materials GDC and LSGM. The maximum electrical conductivity is 1522 S cm(-1) at 100 degrees C and its value is higher than 581 S cm(-1) over the whole temperature range investigated. Microstructures show that the contact between PBSC and LSGM is better than that between PBSC and GDC. The area-specific resistances (ASRs) of PBSC cathode on GDC and LSGM electrolytes are 0.048 and 0.027 Omega cm(2) at 800 degrees C, respectively. The electrolyte-supported (thickness of electrolyte is 300 mu m) fuel cells generate good performance with the maximum power densities of 617 mW cm(-2) on GDC electrolyte and 1021 mW cm(-2) on LSGM electrolyte at 800 degrees C. All results demonstrate that PBSC oxide is a very promising cathode material for application in IT-SOFCs and this cathode based on LSGM electrolyte obtained better performance than on GDC electrolyte. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.