TY - JOUR
T1 - The effect of Sr on the properties of Y-doped ceria electrolyte for IT-SOFCs
AU - Zheng, Yifeng
AU - Wu, Liqiang
AU - Gu, Haitao
AU - Gao, Ling
AU - Chen, Han
AU - Guo, Lucun
PY - 2009/11/3
Y1 - 2009/11/3
N2 - Effect of Sr doping on the ionic conductivity of Y2O3-doped ceria (YDC) with the general formula of Ce0.8Y0.2-xSrxO2-δ (x = 0, 0.05, 0.10 and 0.15) was investigated. The phase identification, microstructures, thermal expansion and ionic conductivities of samples were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), dilatometry and AC impedance spectroscopy (IS). The results showed that the samples of co-doping with Y and Sr can result in higher ionic conductivity and lower activation energy than those of Y singly doped ceria in the temperature range of 450-750 °C. As the substitution amount of Sr for Y increased up to 25 mol% (Ce0.8Y0.15Sr0.05O2-δ), the sample attained the optimum ionic conductivity. At 750 °C, its ionic conductivity is 4.98 × 10-2 S cm-1, which is twice as high as that of Ce0.8Y0.2O1.9. In addition, experimental results also indicated that the grain conduction dominates the total ionic conductivity.
AB - Effect of Sr doping on the ionic conductivity of Y2O3-doped ceria (YDC) with the general formula of Ce0.8Y0.2-xSrxO2-δ (x = 0, 0.05, 0.10 and 0.15) was investigated. The phase identification, microstructures, thermal expansion and ionic conductivities of samples were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), dilatometry and AC impedance spectroscopy (IS). The results showed that the samples of co-doping with Y and Sr can result in higher ionic conductivity and lower activation energy than those of Y singly doped ceria in the temperature range of 450-750 °C. As the substitution amount of Sr for Y increased up to 25 mol% (Ce0.8Y0.15Sr0.05O2-δ), the sample attained the optimum ionic conductivity. At 750 °C, its ionic conductivity is 4.98 × 10-2 S cm-1, which is twice as high as that of Ce0.8Y0.2O1.9. In addition, experimental results also indicated that the grain conduction dominates the total ionic conductivity.
KW - Fuel cells
KW - Ionic conduction
KW - Thermal expansion
KW - X-ray diffraction
UR - http://www.scopus.com/inward/record.url?scp=70350090475&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2009.07.011
DO - 10.1016/j.jallcom.2009.07.011
M3 - 文章
AN - SCOPUS:70350090475
SN - 0925-8388
VL - 486
SP - 586
EP - 589
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 1-2
ER -