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

被引：1

作者：

YEH Tsung-her

CHOU Chen-chia

机构：

[1] AdvancedCeramicsLaboratory,DepartmentofMechanicalEngineering,NationalTaiwanUniversityofScienceandTechnology,Taipei-,China

来源：

材料科学与工程学报 | 2007年 / 06期

关键词：

electrolyte; ionic conductivity; average binding energy; SOFC;

D O I：

10.14136/j.cnki.issn1673-2812.2007.06.003

中图分类号：

O614.332 [];

学科分类号：

摘要：

Microstructural features and ionic conductivity of divalent（Mg 2+）and trivalent（Gd 3+）cations co-doped ceria electrolyte system Ce_ 0.8-xGd_ 0.2MgxO_ 1.9-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 Mg 2+ and Gd 3+ 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）.

引用

页码：861 / 863

页数：3

共 4 条

[1] Study on Gd and Mg co-doped ceria electrolyte for intermediate temperature solid oxide fuel cells[J] . Feng-Yun Wang,Songying Chen,Qin Wang,Shuxin Yu,Soofin Cheng.Catalysis Today . 2004 (2)
[2] Density functional theory calculation on the effect of local structure of doped ceria on ionic conductivity[J] . Hiroyuki Yoshida,Toru Inagaki,Kazuhiro Miura,Minoru Inaba,Zempachi Ogumi.Solid State Ionics . 2003 (1)
[3] Effect of co-dopant addition on properties of gadolinia-doped ceria electrolyte
Kim, N
Kim, BH
Lee, D
[J]. JOURNAL OF POWER SOURCES, 2000, 90 (02) : 139 - 143
[4] Lanthanide co-doping of solid electrolytes: AC conductivity behaviour[J] . J. van Herle,D. Seneviratne,A.J. McEvoy.Journal of the European Ceramic Society . 1999 (6)

← 1 →