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

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• 出版年：2007
• 作者：YEH Tsung-her；CHOU Chen-chia
• 单位1：Advanced Ceramics Laboratory.Department of Mechanical Engineering，National Taiwan University of Science and Technology
• 出生年：1979
• 语种：中文
• 作者关键词：electrolyte；ionic conductivity；average binding energy；SOFC
• 起始页：861
• 总页数：3
• 刊名：材料科学与工程学报
• 是否内版：否
• 刊频：双月刊
• 创刊时间：1983
• 主管单位：国家教育部
• 主办单位：浙江大学
• 主编：赵新兵
• 地址：杭州浙江大学材料系
• 邮编：310027
• 电子信箱：jmse@ema.zju.edu.cn
• 卷：25
• 期：6
• 期刊索取号：P822.06 448
• 数据库收录：美国CA源期刊；全国中文核心期刊；中国科技论文统计源期刊；中国科学引文数据库来源期刊；美国CSA收录期刊
• 核心期刊：全国中文核心期刊

摘要

Microstructural features and ionic conductivity of div alent（Mg^2﹢）and trivalent（Gd^2﹢ ）cations co-doped ceria electrolyte system Ce_0.8-хGd_0.2Mg_xO_1.9-xwere 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°C（0.0105 S/cm） . Co-doping Mg^2﹢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）.