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

作者：Wang Hong; Xu Qing^*; Huang Duan-Ping; Chen Wen; Chen Min; Kim Bok-Hee

来源：Chemical Journal of Chinese Universities, 2009, 30(10): 1925-1929.

• Ce0.8Sm0.2O1.9
• Oxygen ionic conductor
• Combustion synthesis
• Urea

Samaria-doped ceria (Sm0.2Ce0.8O1.9, SDC) is a promising candidate material for electrolyte of inter-mediate temperature (600-800 degrees C) 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 degrees C. Furthermore, the ceramic sintered at the temperature presented superior electrical conductivity, reaching 5.4 x 10(-2) and 1.0 x 10(-1) Omega(-1).cm(-1) at the measuring temperatures of 600 and 800 degrees C, respectively.

• 出版日期2009-10-10
• 单位武汉理工大学