Lanthanum gallate and ceria composite as electrolyte for solid oxide fuel cells

The composite of doped lanthanum gallate (La0.9Sr0.1Ga0.8Mg0.2O2.85, LSGM) and doped ceria (Ce0.8Sm0.2O1.9, CSO) was investigated as an electrolyte for solid oxide fuel cell (SOFC). The LSGM–CSO composite was examined by X-ray diffraction (XRD) and impedance spectroscopy. It was found that the sintered LSGM–CSO composite contains mainly fluorite CeO2 phase and a minority impurity phase, Sm3Ga5O12. The LSGM–CSO composite electrolyte shows a small grain boundary response in the impedance spectroscopy as compared to LSGM and CSO pellets. The composite electrolyte exhibits the highest conductivity in the temperature range of 250–600 °C, compared to LSGM and CSO. The LSGM–CSO composite can be expected to be an attractive intermediate temperature electrolyte material for solid oxide fuel cells.