Fused LSM: A Novel Powder Limiting the Formation of La2Zr2O7 and SrZrO3 Resistive Phases at the Interface with YSZ in SOFC Cathodes

Abstract

In solid oxide fuel cell (SOFC) on the cathode side, the formation of highly electrically resistive phases as La2Zr2O7 (LZO) or SrZrO3 (SZO) at the triple-phase boundary between LSM, YSZ and air decreases the performance of the cell and is partially responsible for the long term degradation of the SOFC. Saint-Gobain Company is making LSM material by fusion process. The reactivity of LSM made by fusion and conventional methods with 8YSZ was compared. Ageing tests were performed by increasing the temperature over 1100{degree sign}C and in several atmospheres (air and N2). Whatever the conditions are, the reactivity of fused LSM is barely if not observable whatever the Sr content is, whereas LSM powders made by conventional methods lead to the formation of LZO or SZO as a function of Sr content. Thus, LSM made by fusion process is a promising material for cathodes to avoid the long term degradation of SOFC.