Stability Investigation for Symmetric Solid Oxide Fuel Cell with La0.4Sr0.6Co0.2Fe0.7Nb0.1 delta(3-delta) Electrode

La0.4Sr0.6Co0.2Fe0.7Nb0.1O3-delta (LSCFN) material has been prepared and evaluated as both cathode and anode for symmetric solid oxide fuel cell with La0.8Sr0.2Ga0.83Mg0.17O3-delta electrolyte in this work. The stability of phase structure, electrode microstructure and polarization resistances for the LSCFN in the atmosphere of air and wet H-2 have been studied with time dependency by X-ray diffraction analysis, scanning electron microscope and electrochemical impedance spectroscopy. The maximum power densities generated by the cell are 650 mW cm(-2) in H-2 and 200 mW cm(-2) in methane at 850 degrees C, respectively. The cell maximum power output has demonstrated to be not affected by the redox cycling of the anode during a total of 21 cyclic testing, indicating that the LSCFN has excellent redox stability. (C) 2015 The Electrochemical Society. All rights reserved.