Pr2NiO4-Ag composite was synthesized and evaluated as cathode component for low temperature solid oxide fuel cells based on ceria-carbonate composite electrolyte. X-ray diffraction analysis reveals that the formation of a single phase K2NIF4 type structure occurs at 1000 degrees C and Pr2NiO4-Ag composite shows chemically compatible with the composite electrolyte. Symmetrical cells impedance measurements prove that Ag displays acceptable electrocatalytic activity toward oxygen reduction reaction at the temperature range of 500-600 degrees C. Single cells with Ag active component electrodes present better electrochemical performances than those of Ag-free cells. An improved maximum power density of 695 mW cm(-2) was achieved at 600 degrees C using Pr2NiO4 Ag composite cathode, with humidified hydrogen as fuel and air as the oxidant. Preliminary results suggest that Pr2NiO4 Ag composite could be adopted as an alternative cathode for low temperature solid oxide fuel cells. Copyright (c) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.