TY - JOUR
T1 - Effect of Sm and Mg co-doping on the properties of ceria-based electrolyte materials for IT-SOFCs
AU - Zheng, Yifeng
AU - Gu, Haitao
AU - Chen, Han
AU - Gao, Ling
AU - Zhu, Xiaofang
AU - Guo, Lucun
PY - 2009/4/2
Y1 - 2009/4/2
N2 - Samples of Sm and Mg co-doped ceria electrolytes of Ce0.8Sm0.2-xMgxO2-δ (x = 0, 0.05, 0.10, 0.15 and 0.20) were sintered from powders obtained by solid-state reaction method. The structures and electrical properties were characterized by X-ray diffraction (XRD) and AC impedance spectroscopy (IS). The thermal expansion curves of samples were measured and the thermal expansion coefficients between 100 and 800 °C were calculated. Results showed that co-doping with appropriate ratio of Sm and Mg can improve the electrical performance of ceria-based electrolytes. As the substitution amount of Mg for Sm increased up to 50 mol%, the conductivity of the samples maintained almost unchanged or even slightly higher than that doped only with Sm in intermediate temperature. The results suggest that the materials cost for producing the ceria-based intermediate temperature solid oxide fuel cells (IT-SOFCs) may be significantly reduced owing to the cost difference between Mg and Sm.
AB - Samples of Sm and Mg co-doped ceria electrolytes of Ce0.8Sm0.2-xMgxO2-δ (x = 0, 0.05, 0.10, 0.15 and 0.20) were sintered from powders obtained by solid-state reaction method. The structures and electrical properties were characterized by X-ray diffraction (XRD) and AC impedance spectroscopy (IS). The thermal expansion curves of samples were measured and the thermal expansion coefficients between 100 and 800 °C were calculated. Results showed that co-doping with appropriate ratio of Sm and Mg can improve the electrical performance of ceria-based electrolytes. As the substitution amount of Mg for Sm increased up to 50 mol%, the conductivity of the samples maintained almost unchanged or even slightly higher than that doped only with Sm in intermediate temperature. The results suggest that the materials cost for producing the ceria-based intermediate temperature solid oxide fuel cells (IT-SOFCs) may be significantly reduced owing to the cost difference between Mg and Sm.
KW - A. Oxides
KW - C. Impedance spectroscopy
KW - D. Electrical properties
KW - D. Ionic conductivity
UR - http://www.scopus.com/inward/record.url?scp=59849109066&partnerID=8YFLogxK
U2 - 10.1016/j.materresbull.2008.09.021
DO - 10.1016/j.materresbull.2008.09.021
M3 - 文章
AN - SCOPUS:59849109066
SN - 0025-5408
VL - 44
SP - 775
EP - 779
JO - Materials Research Bulletin
JF - Materials Research Bulletin
IS - 4
ER -