Abstract
Lanthanum cobaltites doped with strontium and iron (La1-xSrxCo1-yFeyO3) have been intensively studied as cathode materials for solid oxide fuel cells (SOFC). In this work, powders of composition La0.6Sr0.4Co0.2Fe0.8O3 (LSCF6428) were synthesized by a combination of citrate and hydrothermal methods. As-prepared and calcined powders were investigated by different material characterization techniques. LSCF films were obtained on gadolinium doped ceria substrates (CGO) after sintering at 1200 °C. The effects of the sintering conditions on the microstructure and electrochemical performance of the electrodes were evaluated by scanning electron microscopy and impedance spectroscopy. The electrochemical characterization was assessed using a symmetrical cell configuration (LSCF/CGO/LSCF) at temperatures ranging from 650 to 800 °C. The area specific resistance showed strong relationship with microstructure. The best electrochemical behavior (0.18 ohm.cm2 at 800 °C) was obtained by using sintering dwell time of 2 h.
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