Characterization of Cathode/Electrolyte Interphases for IT-SOFCs

LAURA BAQUÉ; K. PADMASREE; A. F. FUENTES; ADRIANA SERQUIS; ANALÍA SOLDATI

Congreso; XIV International Congress of the Mexican Hydrogen Society; 2014

Sociedad Mexicana del Hidrógeno

Solid oxide fuel cells (SOFCs) represent an efficient and environmental friendly technology for obtaining electrical power and heat. In recent years, a considerable researcheffort has been done in order to decrease their operation temperature from 800-1000ºC to the 500-800ºC range. However, the main drawback of lowering SOFC operatingtemperature is the reduction of cell performance and, hence, each individual component and their interfaces must be optimized.In this work, we studied symmetrical cells composed by high performance nanostructured La0.4Sr0.6Co0.8Fe0.2O3-d (LSCFO) cathodes deposited by spin coating on Ce0.8Y0.2O2(CYO) substrates. LSCFO cathodes were synthetized by an acetic acid based method, while the CYO electrolytes were synthesized by mechanical milling. The microstructure ofthe electrolytes, the cathodes and the cathode/electrolyte interphases was investigated by Scanning Electron Microscopy (SEM). The electrochemical performance of theseassemblies was studied by EIS within the 100-600ºC temperature range under pure oxygen.