Abstract
(100–xwt%) La0.85Sr0.15Ga0.8Mg0.2O2.825 (LSGM1520)+(xwt%) Ce0.85Sm0.15O1.925 (SDC15)(x=0, 2, 5, 7, 10, and 100) composite electrolytes were synthesized by a solid-state reaction. The microstructures and electrical properties of the electrolytes were analyzed by X-ray diffractometry, Raman spectroscopy, scanning electron microscopy, thermomechanical analysis, and impedance spectroscopy. The electrolytes, LSGM1520 and 95wt% LSGM1520–5wt% SDC15, based on a La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF6428) cathode and Ce0.8Sm0.2O1.9–Ni (SDC20-Ni) cathode were used to form two SOFCs. The thermal expansion coefficients of the composites ranged from 10.5×10−6/°C to 12×10−6/°C at 200–600°C and 12×10−6/°C to 15×10−6/°C at 600–800°C. The performances and current density of LSCF6428/LSGM1520/SDC20-Ni and LSCF6428/95L05S/SDC20-Ni are 264mW/cm2 and 1.00A/cm2 at 774°C, and 182mW/cm2 and 0.97A/cm2 at 789°C, respectively, and their open circuit voltages (OCV) are ∼1.0–1.1V.
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