Performance of the lanthanum gallate based solid oxide fuel cells with the La2-xCaxNi1-yFeyO4+δ cathodes and Sr2Ni0.75Mg0.25MoO6-δ anode

This study focuses on the application of the La(2)Nia(4)-based cathodes in the electrolyte-supported fuel cells with La0.88Sr0.12Ga0.82Mg0.18O3-delta (LSGM1218) as an electrolyte, Sr2Ni0.75Mg0.25MoO6-delta (SNMM) as an anode and Ce0.8Sm0.2O2-delta (SDC) as an interlayer between the cathode and electrolyte. La2NiO4+delta and La1.5Ca0.5Ni1-yFey-O4+delta (y = 0.3, 0.33, 0.35, 0.37, 0.4) have been synthesized by a citrate-nitrate combustion technique. La1.5Ca0.5Ni0.7Fe0.3O4+delta (LCNF73), La1.5Ca0.5Ni0.67Fe0.33O4+delta (LCNF6733) and La2NiO4+delta have been tested as cathodes for SOFCs. LCNF6733 cathode material has been prepared with different microstructure in fuel cells of similar configuration (designated as I-LCNF6733 and II-LCNF6733). Higher power densities of the II-LCNF6733/SDC/LSGM1218/SNMM fuel cell than those of LCNF73/SDC/LSGM1218/SNMM indicate that iron doping might improve the performance of these oxides as cathode materials. The cells with the II-LCNF6733 and La2NiO4+delta cathodes show similar power densities reaching 277 and 270 mW cm(-2) at 800 degrees C, respectively.