Fe and Nb substituted perovskite SrCo0.9-xNb0.1FexO3-delta (0 < x < 0.3) are investigated as potential cathode materials for intermediate temperature solid oxide fuel cells (SOFCs) and reversible SOFCs (RSOFC). The material's structural stability, electrical conductivity, electrochemical performance and oxygen exchange kinetics were measured. XRD results show improved structural stability of the cubic perovskite structure with Fe doping. A decrease in the electrical conductivity, as well as an increase in the area specific resistance is observed for increasing values of stoichiometric coefficient x. This affect is attributed to limited mobility of oxygen vacancies with the replacement of Co by Fe, as well as to stronger metal-oxygen bonding. The oxygen surface exchange coefficient under different temperatures and oxygen partial pressures was determined. Highest exchange coefficient values were measured with x = 0 Fe doping. The dependence of exchange coefficient on oxygen partial pressure indicates a dissociative adsorption limited process, with participation of molecular oxygen. Activation energies of exchange process were obtained under two different temperature regimes. These results indicate that SrCo0.9-xNb0.1FexO3-delta (0 < x < 0.3) perovskites maintain their structure at intermediate temperatures and show high catalytic activity toward oxygen reduction, and therefore can serve as potential cathode materials for application in SOFCs and RSOFCs. (C) 2016 The Electrochemical Society. All rights reserved.