Performance of intermediate temperature (600–800 °C) solid oxide fuel cell based on Sr and Mg doped lanthanum-gallate electrolyte

The solid electrolyte chosen for this investigation was La0.9Sr0.1Ga0.8Mg0.2O3 (LSGM). To select appropriate electrode materials from a group of possible candidate materials, AC complex impedance spectroscopy studies were conducted between 600 and 800 °C on symmetrical cells that employed the LSGM electrolyte. Based on the results of the investigation, LSGM electrolyte supported solid oxide fuel cells (SOFCs) were fabricated with La0.6Sr0.4Co0.8Fe0.2O3–La0.9Sr0.1Ga0.8Mg0.2O3 (LSCF–LSGM) composite cathode and nickel–Ce0.6La0.4O2 (Ni–LDC) composite anode having a barrier layer of Ce0.6La0.4O2 (LDC) between the LSGM electrolyte and the Ni–LDC anode. Electrical performances of these cells were determined and the electrode polarization behavior as a function of cell current was modeled between 600 and 800 °C.