Stability Investigation for Symmetric Solid Oxide Fuel Cell with La_0.4Sr_0.6Co_0.2Fe_0.7Nb_0.1O_3-δElectrode

La 0.4 Sr 0.6 Co 0.2 Fe 0.7 Nb 0.1 O 3-δ (LSCFN) material has been prepared and evaluated as both cathode and anode for symmetric solid oxide fuel cell with La 0.8 Sr 0.2 Ga 0.83 Mg 0.17 O 3-δ 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°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.