TY - JOUR
T1 - Analysis of the microstructure and physical properties of La0.85Sr0.15Ga0.8Mg0.2O2.825 and Ce0.85Sm0.15O1.925 composite electrolytes used in solid oxide fuel cells
AU - Wu, Yu Chuan
AU - Lee, Ming Jin
AU - Li, Xiang
N1 - Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2015/12
Y1 - 2015/12
N2 - (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.
AB - (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.
KW - Composite electrolyte
KW - Conductivity mechanism
KW - Microstructure
KW - Sintering
KW - Solid oxide fuel cell
UR - http://www.scopus.com/inward/record.url?scp=84943817945&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2015.08.036
DO - 10.1016/j.jeurceramsoc.2015.08.036
M3 - Article
AN - SCOPUS:84943817945
SN - 0955-2219
VL - 35
SP - 4485
EP - 4495
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 16
M1 - 10252
ER -