PrBaCo1.9Ni0.1O5+delta (PBCNO)-xCe(0.8)Sm(0.2)O(1.9) (SDC) (x = 0, 10, 20,30, 40, and 50 wt%) composites are investigated as cathode materials for intermediate temperature solid oxide fuel cells (IT-SOFCs). XRD results show that PBCNO is chemically compatible with the SDC electrolyte at 1000 degrees C. The thermal expansion coefficient (TEC) decreases with the increase of SDC content. The average TEC at the temperature range of 35-900 degrees C decreases from 22.6 x 10(-6) K-1 for pure PBCNO cathode to 15.2 x 10(-6)K(-1) for PBCNO-50SDC composite cathode. The addition of SDC reduces the polarization resistance. The lowest polarization resistance of 0.012 Omega cm(2) is achieved at 800 degrees C for the PBCNO-40SDC composite cathode. In the temperature range of 600-800 degrees C, the PBCNO-40SDC composite cathode delivers the power density of 483 mW cm(-2) at 800 degrees C. These results indicate that PBCNO-40SDC is a promising cathode material for TT-SOFCs. (C) 2015 Elsevier B.V. All rights reserved.