Structure stability and electrical conductivity of LaSr2Fe2CrO9-delta were investigated in air and in hydrogen to explore its potential applications as symmetrical electrodes for solid oxide fuel cells. X-Ray diffraction measurements showed that LaSr2Fe2CrO9-delta was essentially stable despite the presence of minor LaSrFeO4 impurities after heat-treated in humidified hydrogen at 800 degrees C. LaSr2Fe2CrO9-delta-based symmetrical fuel cells fabricated on LSGM electrolyte substrates via screen printing achieved a maximum power density of 224 mW cm(-2). After using a composite electrode (50 wt% LaSr2Fe2CrO9-delta-50 wt%Gd0.2Ce0.8O2-delta), both the anode and the cathode polarization resistances decreased. The maximum power density of symmetrical fuel cells using LaSr2Fe2CrO9-delta-Gd0.2Ce0.8O2-delta composite electrodes increased to 264 mW/cm(2) and the corresponding total cell polarization resistance was 0.454 Omega cm(2) at 800 degrees C with humidified hydrogen fuels and ambient air oxidants. (C) 2014 Elsevier Ltd. All rights reserved.