Co-doping Effect on Microstructures and Ionic Conductivity of Aliovalent Cations Modified Ceria

摘要：

Microstructural features and ionic conductivity of divalent (Mg2 + ) and trivalent (Gd3 + ) cations co-doped ceria electrolyte system Ce0.8-xGd0.2MgxO1.9-x were investigated by scanning electron microscopy (SEM) and AC impedance analysis. The experimental results exhibit that addition of MgO to GDC reduces the average binding energy of GDC by decreasing the energy barrier of oxygen ion migration in ceria matrix and the ionic conductivity of 2 mol％ magnesium doped GDC (0.018 S/cm) is higher than that of GDC matrix at 650℃ (0.0105 S/cm). Co-doping Mg2+ and Gd3+ is found to increase the ionic conductivity of ceria and hence decreases the operation temperature as well as the cost of solid oxide fuel cell (SOFC).

关键词： electrolyte ionic conductivity average binding energy SOFC

作者: YEH Tsung-her CHOU Chen-chia

会议类型: 国际会议

会议名称: 第二届功能原料国际研讨会(The 2rd International Symposium on Functional Materials)

会议地点: 杭州

会议语种:英文

页码: 861-863

在线出版日期: 2007-05-16（万方平台首次上网日期，不代表论文的发表时间）