Lanthanum Aluminate (Lao)-Gadolinium Doped Ceria (GDC) Composite Electrolyte: Characterization and Electrical Behavior

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M. Najim

Abstract

Composite electrolyte materials comprising lanthanum aluminate, LaAlO3 (LAO), and gadolinium doped ceria, Ce0.8Gd0.2O2- (GDC) were developed by mixing these two powders in weight ratios of 3:1, 2:2, and 1:3. The composite electrolyte material was investigated in order to improve conductivity. An X-ray diffractometer (XRD) and scanning electron microscopy (SEM) were used to explore the phase structure and microstructure, while impedance spectroscopy was used to investigate the electrical behaviour (IS). Scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDX) results show a compact structure with a uniform grain distribution and an adequate atomic proportion of constituent elements. The density of LaAlO3 (LAO)- Ce0.8Gd0.2O2 (GDC) composites was measured utilizing the solid-state reaction technique and found to be roughly 97% of its theoretical density. According to electrochemical impedance spectroscopy (EIS) approaches, the electrical behavior of LaAlO3 (LAO)- Ce0.8Gd0.2O2 (GDC) composites yields the highest value on the order of 10-1 S cm-1 at 700 °C, which is more extreme than that of individual LAO and GDC conductivity. The LaAlO3 (LAO)-Ce0.8Gd0.2O2 (GDC) composite material has a higher activation energy of 1.5 eV due to its 3:1 weight ratio.

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