Performance of La0.5Sr0.5Fe0.9Mo0.1O3-δ -Sm0.2Ce0.8O2-δ composite cathode for CeO2- and LaGaO3-based solid oxide fuel cells

The La0.5Sr0.5Fe0.9Mo0.1O3 - delta -x wt.% SDC (LSFMo-xSDC, x = 0, 20, and 30) samples were evaluated as potential cathodes for solid oxide fuel cells (SOFCs) based on both La0.9Sr0.1Ga0.8Mg0.2O3 - delta (LSGM) and Sm0.2Ce0.8O2 - delta (SDC) electrolytes. The LSFMo cathode is chemically compatible with the LSGM and SDC electrolytes with temperature up to 1000 A degrees C. Through the comparison of the polarization resistances (R (p)) of the LSFMo cathode on LSGM and SDC electrolytes, only a small difference of similar to 13-15% in the R (p) was obtained. To further improve the electrochemical performance of the LSFMo cathode, 20 and 30 wt.% SDC were introduced into the LSFMo cathode. The LSGM/SDC-supported single cell with LSFMo-20SDC composite cathode was found to show the optimal performance and excellent power cycle and long-time stability. In addition, the electrical conductivity and thermal expansion coefficient (TEC) for the LSFMo-20SDC cathode were also detected and evaluated. Our results show that the LSFMo-20SDC is a very promising candidate for use in the cathode of SOFC.