LSGM-based electrolytes

Lanthanum gallate (LaGaOs) is doped with divalent metal ions [e.g., strontium and/or magnesium Lai t Sr cMg Gai-3,03 (LSGM) usually, x andy have values between 0 and 1]. Unlike ceria-based electrolytes, this electrolyte can also be used at low oxygen partial pressures without the menace of developing electronic conduction. When in contact with cathodes of the LSM type, some diffusion of manganese and/or cobalt from the cathode into the electrolyte is possible, but this has little effect on fuel cell performance. One defect of this electrolyte material is its complicated preparation. 

SOFCs 500-650 °C, 650-800 °C and 800-1000 °C, with regimes corresponding to ceria-based, LSGM-based and ZrOi-based electrolytes, respectively. Each of these regimes required the development of specific electrodes optimised (or compromised ) for the operating temperature and these electrodes are discussed in the subsequent sections. 

When an LaGaOs-based oxide is applied as a solid electrolyte for SOFCs, reactivity and/or interdiffusion with electrode materials becomes a critical issue. When LSM was used as the cathode material, interdiffusion of Mn into LSGM was... 

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