高等学校化学学报

高等学校化学学报 ›› 2009, Vol. 30 ›› Issue (10): 1925.

• 研究论文 • 上一篇    下一篇

Ce0.8Sm0.2O1.9的尿素燃烧法合成与性能

王红1, 徐庆1, 黄端平1, 陈文1, 陈旻2, 金福熙2   

  1. 1. 武汉理工大学材料科学与工程学院, 武汉 430070;
    2. 韩国全北国立大学氢能与燃料电池研究中心, 全州 561-756
  • 收稿日期:2008-11-07 出版日期:2009-10-10 发布日期:2009-10-10
  • 通讯作者: 徐庆, 男, 博士, 教授, 主要从事氧化物功能陶瓷材料研究. E-mail: xuqing@whut.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 50572079)、武汉市学科带头人计划(批准号: 200851430485)和International Collaboration Program of Jeonbuk Procince资助.

Urea-combustion Synthesis and Properties of Ce0.8Sm0.2O1.9

WANG Hong1, XU Qing1*, HUANG Duan-Ping1, CHEN Wen1, CHEN Min2, KIM Bok-Hee2   

  1. 1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;
    2. Department of Hydrogen and Fuel Cells Engineering, Hydrogen & Fuel Cell Research Center, Chonbuk National University, Jeonbuk 561-756, South Korea
  • Received:2008-11-07 Online:2009-10-10 Published:2009-10-10
  • Contact: XU Qing. E-mail: xuqing@whut.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 50572079)、武汉市学科带头人计划(批准号: 200851430485)和International Collaboration Program of Jeonbuk Procince资助.

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摘要：

采用以尿素为燃料的燃烧合成法制备Ce0.8Sm0.2O1.9(SDC)氧离子导体材料, 对燃烧合成粉体的物相和显微形态进行了表征, 并研究了燃烧法合成SDC的烧结性能以及烧结体的导电性能. 研究结果表明, 采用尿素燃烧法合成SDC具有简便高效和合成粉体烧结活性高的优点. 经过燃烧过程后即可得到立方萤石结构的纯相SDC粉体, 合成粉体的分散性良好, 为50~150 nm的球形颗粒, 具有高的烧结活性, 在1250 ℃的烧结温度下, 陶瓷样品的相对密度可达到95.1%. 在600和800 ℃的测试温度下, 烧结温度为1250 ℃的陶瓷样品的电导率分别达到5.4×10-2和1.0×10-1 Ω-1·cm-1.

关键词: Ce0.8Sm0.2O1.9; 氧离子导体; 燃烧合成; 尿素

Abstract:

Samaria-doped ceria(Sm0.2Ce0.8O1.9, SDC) is a promising candidate material for electrolyte of intermediate temperature(600—800 ℃) solid oxide fuel cells(IT-SOFCs). SDC powders were synthesized by a combustion method with urea as a fuel. The phase purity and morphology of the resulting powders were characterized by XRD, TG-DSC, FESEM and BET specific surface area measurement. Moreover, the sinterability and electrical conductivity of the SDC were examined. The results demonstrate that the urea-combustion process is a simple and efficient route to produce high reactive SDC powder. It was found that the SDC powder with a pure cubic fluorite phase could be produced via a short-time combustion process. The SDC powder is composed of uniform and dispersed sphere-like particles in the range of 50—150 nm. This desired morphology effectively enhanced the sinterability of the powder. A gas-tight relative density of 95.1% was obtained in the SDC ceramic sintered at a relative low temperature of 1250 ℃. Furthermore, the ceramic sintered at the temperature presented superior electrical conductivity, reaching 5.4×10-2 and 1.0×10-1 Ω-1·cm-1 at the measuring temperatures of 600 and 800 ℃, respectively.

Key words: Ce0.8Sm0.2O1.9; Oxygen ionic conductor; Combustion synthesis; Urea

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