Electrode/Electrolyte Interphase Studies of Ceria Based Electrolytes for IT-SOFCs

BAQUÉ, LAURA; PADMASREE, K.; FUENTES, ADOLFO; SERQUIS, ADRIANA C.; SOLDATI, ANALIA L.

ECS Transactions

Electrochemical Society

Lugar: Pennington; Año: 2014 vol. 64 p. 191 - 199

1938-6737

Solid oxide fuel cells (SOFCs) require high operation temperatures (up to 800°C) in order to allow oxygen ion conduction through the ceramic electrolyte. Lowering SOFC operation temperature implies enhancing the transport and electrochemical properties of both electrolyte and cathode. In this work, the electrochemical performance of nanostructured La0.4Sr0.6Co0.8Fe0.2O3-d (LSCFO)/Ce0.8Gd0.2O2-d(CGO)/LSCFO and  LSCFO/Ce0.8Nd0.2O2-d (CNO)/LSCFO symmetrical cells was investigated. The bulkconductivity is similar for both electrolytes, while the grain boundary and total conductivities are higher for the CGO electrolyte. Nevertheless, CGO electrolyte exhibits large pores thatcompromise its mechanical properties. In addition, cathode performance degrades in LSCFO/CGO/LSCFO cells.