Solid Oxide Fuel Cell (SOFC) cathode suffers from different contaminations, such as CO2, when the cell is operated under the realistic conditions. Herein, mechanism of CO2 corrosion on high performance Ba0.9Co0.7Fe0.2Nb0.1O3-delta (BCFN) cathode has been studied. Xray diffraction (XRD) and conductivity measurement show that CO2 has no detrimental effects on BCFN electrode at 600 degrees C. However, the reaction between BCFN and CO2 will occur because of surface oxygen loss of BCFN at 800 degrees C. Most importantly, the electrochemical impedance spectrum results show that BCFN electrode contaminated by CO2 can be recovered by purging air again. These results suggest that BCFN could be a very promising cathode material for SOFCs. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.