A Comparative Study on Electrochemical Behavior of (La, Sr)FeO_3 and (La, Sr)FeO_3-(La, Sr)MnO_3 Anodes for Solid Oxide Electrolysis Cells

摘要

La_(0.8)Sr_(0.2)FeO_3 electrodes modified with nanoparticles of La_(0.8)Sr_(0.2)MnO_3 (LSF/LSM) were prepared by infiltration method. LSM solution had good wettability on LSF surfaces and good electrochemical compatibility with LSF. The impedance of half-cells incorporating the electrodes was also examined. The deconvolution of the impedance spectrum indicated that the peak positions are changed after the LSF infiltration. The LSF/LSM electrode exhibited smaller polarization resistance than pure LSF electrode. Finally, a transform from asymmetry to symmetry appeared in the polarization curves of LSF/LSM electrode with the increase of temperature.