Co-doping Effect on Microstructures and Ionic Conductivity of Aliovalent Cations Modified Ceria
来源期刊：材料科学与工程学报2007年第6期
论文作者：CHOU Chen-chia YEH Tsung-her
关键词：electrolyte; ionic conductivity; average binding energy; SOFC;
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).
CHOU Chen-chia1，YEH Tsung-her1
(1.Advanced Ceramics Laboratory, Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei-10672, China)
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;
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