This work reports the characteristics of Sm(0.5)Sr05CoO(3-delta) (SSC) cathode including its chemical bulk diffusion coefficient (D-chem), current density (i(0)), and single cell performance. In this study, the value of D-chem is measured by an electrical conductivity relaxation (ECR) technique. The equation of D-chem as a function of temperature in the range of 500-700 degrees C exhibits as follows: D-chem = 4.65 x 10(-5) exp (-91.33 (kJ mol(-1)/RT)) (m(2) s(-1)) To improve the cathode performance, the active ionic-conductive Ce0.8Sm0.2O1.9 (SDC) nanoparticles deposit on a porous SSC cathode surface by infiltration method. The enhancement in electrochemical performances is ascribed to the creation of electrolyte/cathode phase boundaries, which considerably increases the electrochemical sites for oxygen reduction reaction. In this work, the 0.2 M SDC-infiltrated SSC reveals the maximum peak power density of 489 mW cm(-2) at operating temperature of 700 degrees C with a thin film SDC electrolyte (30 mu m), a Ni + SDC anode (1 mm) and a SDC-infiltrated SSC cathode (20 mu m). (C) 2013 Elsevier B.V. All rights reserved.