La0.7Sr0.3Mn0.8Mg0.2O3-δ perovskite type oxides for NO decomposition by the use of intermediate temperature solid oxide fuel cells

A Mg-doped perovskite oxide La0.7Sr0.3Mn0.8Mg0.2O3-delta ( LSMM) is synthesized and investigated as potential cathode material for NO decomposition. XRD, TEM, and SEM are carried out to analyze the structure and micromorphology of the perovskite oxide and the cell. Catalytic activity of LSMM for NO conversion is tested on fixed bed. The electrochemical impedance spectroscopy ( EIS) is used to evaluate the electrochemical activity of LSMM through symmetric cells. In order to get insight into the effect of operating temperature and gas composition on the cell performance, the electrolyte-supported fuel cells with LSMM as the cathode are tested. The cell obtains a maximum power density of 13.06 mW cm(-2) with 0.5% NO in Ar over the cathode and 10% H-2 fed to the anode at 700 degrees C. The increase of both operating temperature and NO concentration can enhance the maximum power density. (C) 2015 Elsevier B.V. All rights reserved.