TY - JOUR
T1 - La and Ca co-doped ceria-based electrolyte materials for IT-SOFCs
AU - Zheng, Yifeng
AU - Shi, Yueming
AU - Gu, Haitao
AU - Gao, Ling
AU - Chen, Han
AU - Guo, Lucun
PY - 2009/8/5
Y1 - 2009/8/5
N2 - Co-doped ceria-based electrolytes of Ce1-xLax-yCayO2-δ, wherein x = 0.15 and 0.20, 0 ≤ y ≤ x, were sintered from powders obtained by solid state reaction method. The phase identification, thermal expansion and ionic conductivities of samples were studied by X-ray diffraction (XRD), dilatometry and AC impedance spectroscopy (IS). Results showed that the samples of co-doping with La and Ca can significantly increase the ionic conductivity and lower activation energies compared with those of the singly doped ones in the temperature range of 500-800 °C. The ionic conductivities of co-doping samples decrease with Ca content. Although both systems reached the optimum ionic conductivity at y = 0.05, Ce0.85La0.15-yCayO2-δ exhibits better electrical performance. The results also showed that all the synthesized samples were fluorite-type ceria-based solid solutions. The thermal expansion was linear for all the samples.
AB - Co-doped ceria-based electrolytes of Ce1-xLax-yCayO2-δ, wherein x = 0.15 and 0.20, 0 ≤ y ≤ x, were sintered from powders obtained by solid state reaction method. The phase identification, thermal expansion and ionic conductivities of samples were studied by X-ray diffraction (XRD), dilatometry and AC impedance spectroscopy (IS). Results showed that the samples of co-doping with La and Ca can significantly increase the ionic conductivity and lower activation energies compared with those of the singly doped ones in the temperature range of 500-800 °C. The ionic conductivities of co-doping samples decrease with Ca content. Although both systems reached the optimum ionic conductivity at y = 0.05, Ce0.85La0.15-yCayO2-δ exhibits better electrical performance. The results also showed that all the synthesized samples were fluorite-type ceria-based solid solutions. The thermal expansion was linear for all the samples.
KW - A. Ceramics
KW - C. Impedance spectroscopy
KW - D. Ionic conductivity
KW - D. Thermal expansion
UR - http://www.scopus.com/inward/record.url?scp=67349192624&partnerID=8YFLogxK
U2 - 10.1016/j.materresbull.2009.03.017
DO - 10.1016/j.materresbull.2009.03.017
M3 - 文章
AN - SCOPUS:67349192624
SN - 0025-5408
VL - 44
SP - 1717
EP - 1721
JO - Materials Research Bulletin
JF - Materials Research Bulletin
IS - 8
ER -