Ionic conductivity of infiltrated Ln（Ln=Gd,Sm,Y）-doped ceria
来源期刊：Rare Metals2018年第9期
论文作者：Jiang-Wei Ju Dao-Ming Huan Yan-Xiang Zhang Chang-Rong Xia Guang-Lei Cui
文章页码：734 - 742
摘 要：This work studies the ionic conductivity of nanosized Gd-, Sm-, and Y-doped ceria prepared by the infiltration/impregnation method. The nanoparticles were deposited onto porous pure ceria substrates via infiltrationheating processes, and the conductivity was determined with the electrochemical impedance spectroscopy （EIS）using the conductive model for infiltrated phases. The conductivity of the infiltrated doped ceria changes with the doping amount, and Gd0.25Ce0.75O2-δ, Sm0.2Ce0.8O2-δ,and Y0.15Ce0.85O2-δ show the highest values of 2.56, 3.01,and 2.07×10-3 S·cm-1 at 600℃,respectively. Overall,Sm-doped samples show the highest conductivity, whileY-doped samples show the lowest conductivity. In consideration of the Bruggeman factor, the intrinsic conductivity of the infiltrated doped ceria was calculated.Compared with the bulk doped ceria, the intrinsic conductivity is higher while the activation energy is lower,which may suggest different conduction mechanisms.Besides, co-doping effects on the conductivity of the infiltrated sample are less obvious than those of the bulk sample.
Jiang-Wei Ju1，Dao-Ming Huan2，Yan-Xiang Zhang3，Chang-Rong Xia2，Guang-Lei Cui1
1. Qingdao Industrial Energy Storage Research Institute,Qingdao Institute of Bio-energy and Bio-process Technology,Chinese Academy of Sciences2. CAS Key Laboratory of Materials for Energy Conversion,Department of Materials Science and Engineering& Collaborative Innovation Center of Suzhou Nano Science and Technology,University of Science and Technology of China3. National Key Laboratory for Precision Hot Pressing of Metals,School of Materials Science and Engineering,Harbin Institute of Technology
摘 要：This work studies the ionic conductivity of nanosized Gd-, Sm-, and Y-doped ceria prepared by the infiltration/impregnation method. The nanoparticles were deposited onto porous pure ceria substrates via infiltrationheating processes, and the conductivity was determined with the electrochemical impedance spectroscopy （EIS）using the conductive model for infiltrated phases. The conductivity of the infiltrated doped ceria changes with the doping amount, and Gd0.25Ce0.75O2-δ, Sm0.2Ce0.8O2-δ,and Y0.15Ce0.85O2-δ show the highest values of 2.56, 3.01,and 2.07×10-3 S·cm-1 at 600℃,respectively. Overall,Sm-doped samples show the highest conductivity, whileY-doped samples show the lowest conductivity. In consideration of the Bruggeman factor, the intrinsic conductivity of the infiltrated doped ceria was calculated.Compared with the bulk doped ceria, the intrinsic conductivity is higher while the activation energy is lower,which may suggest different conduction mechanisms.Besides, co-doping effects on the conductivity of the infiltrated sample are less obvious than those of the bulk sample.
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