Electrical Behavior of Lanthanum Aluminate (LAO) and Gadolinium Doped Ceria (GDG) Composite Electrolyte for Electrochemical Devices

The LAO-GDC solid composite electrolyte has been proposed for use in Solid Oxide Fuel Cells (SOFC). material conductivity of Carbonate-Ceria (SCC) electrolytes is 0.04Scm-1 between 400 and 700°C. For this purpose, mixtures LaAlO3 (LAO) gadolinium doped ceria Ce0.8Gd0.2O2 (GDC) were created weight ratios 3:1, 2:2, 1:3. was studied separately to improve conductivity. phase structure microstructure using an X-Ray Diffractometer (XRD) Scanning Electron Microscopy (SEM), the electrical behavior investigated Impedance Spectroscopy (IS). SEM Energy Dispersive X-ray spectroscopy (EDX) demonstrated a compact with acceptable atomic percentage constituent elements uniform grain distribution. Experimental investigation showed that had high density (LAO)-Ce0.8Gd0.2O2 composites approximate 97% its theoretical. highest value 0.1Scm-1 at 700°C, which more extreme than individual conductivities LAO GDC, according Electrochemical (EIS) techniques. Among three system, only ratio 3:1 better higher activation energy 1.5eV.