Nano-based solid electrolyte CeO_2 Preparation and Properties

Title: Nano-based solid electrolyte CeO_2 Preparation and Properties Author: Lin Nan Degree-granting unit: Heilongjiang University Keywords: mixed alkali-mediated method;; CeO_2;; nano electrolyte;; conductivity Summary: Solid oxide fuel cell (SOFC) is recognized as the 21st century, a clean, pollution-free, efficient energy systems, including solid oxide electrolyte (oxygen ion conductor) is an important core component. Because of CeO2-based solid electrolyte ZrO2-based solid electrolyte higher than the ionic conductivity and a potential intermediate temperature solid electrolyte material. However, CeO2-based electrolyte materials, there are still some shortcomings, limiting their practical goods. For example: CeO2-based electrolyte material preparation process complex; high-quality ceramics sintered at higher temperatures. In addition, CeO2-based electrolyte materials in oxygen ion Neodymium Magnets conductivity in the lower temperature zone. There is an urgent need to develop easy processing, the temperature zone has good electrical properties of CeO2-based electrolyte materials. This thesis research focused on the following aspects: In this paper a mixed alkali-mediated method (CHM) prepared Ce1-xLnxO2-δ (Ln = Pr, Nd, Sm, Gd) (x = 0.05-0.25) nano-electrolyte materials. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and other tests carried out by means of sample characterization. XRD patterns prove that the product is derived from cubic fluorite structure. TEM images show Ce1-x (Nd / Pr) xO2-δ sample for nanoparticles, Ce1-x (Sm / Gd) xO2-δ nano-particles. Sintering temperature of 1350-1400 ℃, the relative density of 80%. Electrochemical impedance spectroscopy (EIS) on the electrochemical properties of the material tested. The results show that Ce0.80Nd0.20O2-δ in the temperature region with high conductivity, 800 ℃ air atmosphere, the conductivity reached 4.1 × 10-2 S cm-1, conductivity activation energy is 0.83 eV. To further enhance the Ce1-xLnxO2-δ (Ln = Pr, Nd) electrolyte material density and electrical properties, we use the same synthetic route to http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets prepare a series of rare earth - transition metal-doped of Ce1-x-yLnxCoyO2-δ (Ln = Pr, Nd) nano-electrolyte material, and the characteristics of the synthesized product, a systematic study of nature. The synthesis of Ce1-x-yPrxCoyO2-δ and Ce1-x-yNdxCoyO2-δ samples for the nanorods and nanoparticles. 1400 ℃ Relative density of sintered samples up to 90%. At 800 ℃, Ce0.78Nd0.2Co0.02O2-δ of the conductivity of 0.10S cm-1. Rare earth - transition metal-doped nano-CeO2-based electrolyte than the rare-earth single-doped CeO2-based electrolyte materials with higher ionic conductivity and low conductivity activation energy. Degree Year: 2010