Efficient and stable symmetrical electrode La0.6Sr0.4Co0.2Fe0.7Mo0.1O3-delta for direct hydrocarbon solid oxide fuel cells

The single-phase La0.6Sr0.4Co0.2Fe0.7Mo0.1O3-delta symmetrical electrode is obtained by doping Mo at the B site of the La0.6Sr0.4Co0.2Fe0.7Mo0.1O3-delta cathode. La0.6Sr0.4Co0.2Fe0.7Mo0.1O3-delta shows good structural stability in reducing and oxidizing conditions. At 800 degrees C, the polarization resistances are 0.041 and 0.226 Omega cm(2) in air and H-2, respectively. The electrochemical impedance stability measurement results show that La0.6Sr0.4Co0.2Fe0.7Mo0.1O3-delta demonstrates satisfying electrochemical stability either as cathode or anode. The output performances of the La0.6Sr0.4Co0.2Fe0.7Mo0.1O3-delta symmetrical electrode are 929 and 481 mW cm(-2) under H-2 and ethanol fuel at 850 degrees C, respectively. The output performance stability test of a single cell is carried out in liquid petroleum gas and the La0.6Sr0.4Co0.2Fe0.7Mo0.1O3-delta electrode shows good ability of tolerating carbon deposition and resisting sulfur poisoning. The good structure stability, high performance, and satisfying electrochemical stability make La0.6Sr0.4Co0.2Fe0.7Mo0.1O3-delta a promising symmetrical electrode for SOFC application. (C) 2019 Elsevier Ltd. All rights reserved.