Preparation and characterization of SDC nanorods/LNC nanocomposite electrolyte
来源期刊：Journal of Rare Earths2016年第7期
论文作者：许飞 李传明 汪镇涛 叶祝鹏 张渊 曾燕伟
文章页码：711 - 716
摘 要：The nanocomposite electrolytes composed of Sm0.2Ce0.8O1.9（SDC） nanorods enclosed by {110} and {100} facets and a binary carbonate((Li0.52Na0.48)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 ℃, respectively. Additionally, the protonic and oxide ionic conductivities of nanocomposite electrolytes were found to reach 20 and 18 mS /cm at 650 ℃, 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.
许飞，李传明，汪镇涛，叶祝鹏，张渊，曾燕伟
State Key Laboratory of Materials-oriented Chemical Engineering, School of Materials Science and Engineering, Nanjing Tech University
摘 要：The nanocomposite electrolytes composed of Sm0.2Ce0.8O1.9（SDC） nanorods enclosed by {110} and {100} facets and a binary carbonate((Li0.52Na0.48)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 ℃, respectively. Additionally, the protonic and oxide ionic conductivities of nanocomposite electrolytes were found to reach 20 and 18 mS /cm at 650 ℃, 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.
关键词：
