In this work, double perovskite-type oxide PrBa0.5Sr0.5Co1.5Fe0.5O5+delta (PBSCF) is synthesized by the conventional wet chemical method and firstly characterized as the oxygen electrode for reversible solid oxide electrochemical cells (RSOCs). The microstructure and electrochemical performance of RSOCs based on this oxygen electrode are investigated. The maximum power density of the cell reaches 986 mW/cm(2) at 800 degrees C and the cell has good stability in short-term test in fuel cell (SOFC) mode. In electrolysis cell (SOEC) mode, it displays an electrolysis current density as high as 1.3 A/cm(2) when the temperature, absolute humidity (AH) and applied voltage are 800 degrees C, 50 vol % and 1.3 V, respectively. The cells also exhibit excellent durability of 120 h in SOEC mode and present good reversibility. The results suggest that the RSOCs based on this oxygen electrode has a very promising prospect. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.