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

Abstract

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

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. doi: 10.3866/PKU.WHXB201311141

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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

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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