All-perovskite solid oxide fuel cells, synthesis and characterization

Abstract

Strontium- and magnesium-doped lanthanum gallate (LSGM) has been considered as a promising electrolyte for solid oxide fuel cell (SOFC) systems in recent years. In this work synthesis, electrochemical properties, phase evolution, and microstructure of an all-perovskite electrolyte-supported SOFC based on La 0.75Sr0.25Cr0.5Mn0.5O3 (LSCM) porous anode, La0.8Sr0.2Ga0.7Mg 0.3O2.8 (LSGM-2030) electrolyte, and La 0.8Sr0.2MnO3 cathode at intermediate temperatures are studied. The phase evolution of synthesized LSGM and LSCM powders has been investigated, and it validates that there is no reaction between LSGM and LSCM at sintering temperature. The characterization study of the synthesized LSGM also indicates that sintering at 1500°C gives higher electrical conductivity compared with the currently published results, while for the pellets sintered at 1400°C and 1450°C the conductivity would be slightly lower. The effects of the firing temperature on the bulk and grain boundary resistivities are also discussed. Copyright © 2009 by ASME.