Chemical stability of the La0.9Sr0.1Ga0.8Mg0.2O2.85 electrolyte in a reducing atmosphere
Abstract Chemical Stability of La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 2.85 as an SOFC electrolyte was investigated in humidified hydrogen at 1273 K. After annealing at 1273 K, significant changes were observed in the surface morphology of the electrolyte, and La(OH) 3 , LaSrGaO 4 and some unknown phases were formed, which can be interpreted as a result of the vaporization of Ga components such as Ga 2 O. After annealing at 1073 K, changes in the morphology were small, but a slight amount of Ga depletion was also observed. The existence of Pt enhances the Ga depletion from the electrolyte in the reducing atmosphere probably because of the formation of Pt–Ga alloy.