Characterization of LSCF-Based Composite and LSCF as Cathodes for Intermediate Temperature SOFCs

Abstract

The (La0.60Sr0.40)(Co0.20Fe0.80)O3-δ - LSCF, (Ce0.90Gd0.10)O1.95 - CGO composites and LSCF were deposited by wet powder spraying deposition method for the purpose of investigating their potential use in Intermediate Temperature Solid Oxide Fuel Cells. The interlayers are necessary between CGO electrolytes and LSCF cathodes in order to improve the performance of these materials. LSCF particles synthesized by citrate technique were calcined at 900 °C for 4 h and, their LSCF-CGO composites and LSCF suspensions deposited on CGO substrate and, sintered in 1100 °C for 1 h, were formed pseudo-perovskite. The ceramics materials were analyzed by X-ray diffraction (XRD) and chemical composition of different half-cells layers by scanning electron microscope with energy dispersive (SEM-EDS). The results are in agreement with the literature and indicate that route studied is adequate for crystal structures formation compatible with films the 35 µm thick total for study of conductivity between the cathode and the electrolyte.

Facile Synthesis of Lanthanum Strontium Cobalt Ferrite (LSCF) Nanopowders Employing an Ion-Exchange Promoted Sol-Gel Process

“…Oxygen reduction is known to be responsible for the considerable loss in performance efficiency of SOFC, thus the catalytic activity of the cathode material and its internal structure has been researched and improved through several methods in recent times. One of the methods is through using mixed ionic-electronic conducting cathodes such as nanostructured perovskite-based materials having a larger surface area yielding a greater triple-phase boundary area to help increase the performance of IT-SOFCs [3]. Therefore, recent attention is focused on the development of new cathode materials having a perovskite structure with high catalytic efficiency for oxygen reduction and solid electrolyte materials having high oxide-ion conductivity and transference number close to unity.…”