Preparation and characterization of SDC nanorods/LNC nanocomposite electrolyte

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• 作者：Fei XU (许 飞) ; Chuanming LI (李传明) ; Zhentao WANG (汪镇涛) ; Zhupeng YE (叶祝鹏) ; Yuan ZHANG (张 渊) ; Yanwei ZENG (曾燕伟) ; ^{stephen_zeng@njtech.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：SDC nanorods ; SDC/LNC nanocomposite electrolyte ; protonic and oxide ionic conductivities ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：34
• 期：7
• 页码：711-716
• 全文大小：1431 K

文摘

The nanocomposite electrolytes composed of Sm_0.2Ce_0.8O_1.9 (SDC) nanorods enclosed by {110} and {100} facets and a binary carbonate ((Li_0.52Na_0.48)₂CO₃, LNC) were prepared by a wet mixing method to investigate the conduction mechanism. The X-ray diffraction (XRD), scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) techniques were employed to characterize the phase components and microstructures of SDC nanorods and SDC nanorods/LNC composite electrolytes. X-ray powder diffraction showed that a well-cubic fluorite structure was formed. The AC impedance spectroscopy and DC polarization method were used to measure the electrical conductivities of nanocomposite electrolytes under different conditions. The overall ionic conductivities of nanocomposite electrolytes in the air and hydrogen atmospheres were measured up to 82 and 96 mS/cm at 650 °C, respectively. Additionally, the protonic and oxide ionic conductivities of nanocomposite electrolytes were found to reach 20 and 18 mS/cm at 650 °C, respectively. The conduction mechanism was discussed in detail by comparing the conductivities of nanocomposite electrolytes. The protonic conductivity of SDC nanorods/LNC nanocomposite was higher than oxide ionic conductivity. The melt of LNC and the interface layer may make a dominant contribution to oxide ions and protonic conductivity in air and hydrogen atmosphere, respectively.