Synthesis and properties of ceria based electrolyte for IT-SOFCs

• Published in: International journal of hydrogen energy Vol. 41; no. 36; pp. 15979 - 15984
• Main Authors: Yang, Jie, Ji, Bifa, Si, Jingyu, Zhang, Quanzheng, Yin, Qiyi, Xie, Jingsong, Tian, Changan
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 28.09.2016
• Subjects: Ceria; Co-doping; IT-SOFCs; Sol–gel method; IT-SOFCs; Sol–gel method; Ceria; Co-doping
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2016.04.212

Fluorite oxides Ce0.8Y0.18M0.02O2 − δ (denoted as MYDC for M = Ca, Sr, Fe and La), were prepared by the sol–gel method used as electrolytes for intermediate-temperature solid oxide fuel cells (IT-SOFCs). X-ray diffraction data show that all the compositions were obtained with highly phase-pure cubic fluorite structure. The relatively density of all the samples sintered at 1400 °C is more than 95%. Surface morphology has been studied by scanning electron microscope showing a dense microstructure. AC impedance spectroscopy measurements have been carried out to study the ionic conductivity of the samples in the temperature range 400–800 °C. In all composition, Ce0.8Y0.18La0.02O2 − δ shows the maximum conductivity of 0.057 S/cm at 800 °C and shows a good prospect of application in IT-SOFCs. •Fluorite oxides Ce0.8Y0.18M0.02O2 − δ (denoted as MYDC for M = Ca, Sr, Fe and La), were prepared by the sol–gel method.•The relatively density of all the samples sintered at 1400 °C is more than 95%.•Ce0.8Y0.18La0.02O2 − δ shows the maximum conductivity of 0.057 S/cm at 800 °C among all the compositions investigated.