Ce0.8Nd0.2O1.9-La0.95Sr0.05Ga0.9Mg0.1O3-δ固体复合电解质的结构和电性能

doi:10.3866/PKU.WHXB201311141

物理化学学报 >> 2014, Vol. 30 >> Issue (1): 95-101.doi: 10.3866/PKU.WHXB201311141

Ce_0.8Nd_0.2O_1.9-La_0.95Sr_0.05Ga_0.9Mg_0.1O_3-δ固体复合电解质的结构和电性能

汪秀萍, 周德凤, 杨国程, 孙世成, 李朝辉

长春工业大学化学与生命科学学院, 长春 130012

收稿日期:2013-08-11 修回日期:2013-11-11 发布日期:2014-01-01
通讯作者: 周德凤 E-mail:defengzhou65@126.com
基金资助:
国家自然科学基金(20871023)和吉林省科技发展计划(20101549，20130102001JC)资助项目

Structure and Electrical Properties of Ce_0.8Nd_0.2O_1.9-La_0.95Sr_0.05Ga_0.9Mg_0.1O_3-δ Solid Composite Electrolytes

WANG Xiu-Ping, ZHOU De-Feng, YANG Guo-Cheng, SUN Shi-Cheng, LI Zhao-Hui

School of Chemistry and Life Science, Changchun University of Technology, Changchun 130012, P. R. China

Received:2013-08-11 Revised:2013-11-11 Published:2014-01-01
Contact: ZHOU De-Feng E-mail:defengzhou65@126.com
Supported by:
The project was supported by the National Natural Science Foundation of China (20871023) and Science Research Foundation of Jilin Province, China (20101549, 20130102001JC).

摘要/Abstract

摘要：

采用溶胶-凝胶法分别制备La_0.95Sr_0.05Ga_0.9Mg_0.1O_3-δ (LSGM)和Ce_0.8Nd_0.2O_1.9 (NDC)电解质，并在NDC溶胶中加入0-15% (w，质量分数)的LSGM预烧粉体制得NDC-LSGM复合电解质，研究不同质量比复合电解质的结构和电性能. 采用X射线衍射(XRD)、场发射扫描电子显微镜(FE-SEM)和X能量色散谱仪(EDS)对样品进行结构表征，交流(AC)阻抗谱测试样品导电性能. 结果表明：NDC-LSGM复合体系主要由立方萤石结构相、钙钛矿结构相和杂质相组成；LSGM的添加可促进晶粒的生长，产生大量相界面，清除或降低SiO₂有害影响，明显提高晶界导电性；LSGM质量分数为10%的样品NL10 具有最高晶界电导率和总电导率，400 ℃时NL10 的晶界电导率σ_gb和总电导率σ_t分别为12.15×10^-4和3.49×10^-4 S·cm^-1，与NDC的σ_gb (1.41×10^-4 S·cm^-1)和σ_t (1.20×10^-4 S·cm^-1)相比分别提高了7.62和1.91倍，总电导率的提高主要归因于晶界电导率的影响.

关键词: 复合电解质, 掺钕氧化铈, 交流阻抗谱, 晶界电导率, 镓酸镧

Abstract:

Ce_0.8Nd_0.2O_1.9 (NDC) and La_0.95Sr_0.05Ga_0.9Mg_0.1O_3-δ (LSGM) electrolytes were each prepared using a sol-gel method. NDC-LSGM composite electrolytes were then prepared by adding 0-15% (w, mass fraction) precalcined LSGM powders to NDC sols. The microstructure and phase composition of the pellets were characterized using X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), and energydispersive X-ray spectroscopy (EDS). The electrical conductivities of the pellets were measured using alternative current (AC) impedance spectroscopy. The results showed that all the composites were composed of the cubic fluorite structure, perovskite structure, and secondary phases. The LSGM additive significantly promoted grain growth. The grain boundary conduction increased greatly as a result of the presence of phase interfaces and mitigation of the harmful effects of SiO₂ impurities. NL10 was found to have the highest conductivities (σ_gb=12.15×10^-4 S·cm^-1, σ_t=3.49×10^-4 S·cm^-1 at 400 ℃); these values are 7.62 and 1.91 times higher than those of NDC (σ_gb=1.41×10^-4 S·cm^-1, σ_t=1.2×10^-4 S·cm^-1). The enhancement of the total conductivity of NL10 is mainly attributed to the large increase in grain boundary conductivity.

Key words: Composite electrolyte, Neodymium-doped ceria, AC impedance spectroscopy, Grain boundary conductivity, Lanthanum gallate

汪秀萍, 周德凤, 杨国程, 孙世成, 李朝辉. Ce_0.8Nd_0.2O_1.9-La_0.95Sr_0.05Ga_0.9Mg_0.1O_3-δ固体复合电解质的结构和电性能[J]. 物理化学学报, 2014, 30(1): 95-101.

WANG Xiu-Ping, ZHOU De-Feng, YANG Guo-Cheng, SUN Shi-Cheng, LI Zhao-Hui. Structure and Electrical Properties of Ce_0.8Nd_0.2O_1.9-La_0.95Sr_0.05Ga_0.9Mg_0.1O_3-δ Solid Composite Electrolytes[J]. Acta Phys. -Chim. Sin., 2014, 30(1): 95-101.

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201311141

https://www.whxb.pku.edu.cn/CN/Y2014/V30/I1/95

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Ce_0.8Nd_0.2O_1.9-La_0.95Sr_0.05Ga_0.9Mg_0.1O_3-δ固体复合电解质的结构和电性能

Structure and Electrical Properties of Ce_0.8Nd_0.2O_1.9-La_0.95Sr_0.05Ga_0.9Mg_0.1O_3-δ Solid Composite Electrolytes

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Ce0.8Nd0.2O1.9-La0.95Sr0.05Ga0.9Mg0.1O3-δ固体复合电解质的结构和电性能

Structure and Electrical Properties of Ce0.8Nd0.2O1.9-La0.95Sr0.05Ga0.9Mg0.1O3-δ Solid Composite Electrolytes

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Structure and Electrical Properties of Ce_0.8Nd_0.2O_1.9-La_0.95Sr_0.05Ga_0.9Mg_0.1O_3-δ Solid Composite Electrolytes