高等学校化学学报

高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (10): 1791.

• 研究论文 • 上一篇    下一篇

新型固体电解质Ce6-xSmxMoO15-δ(0≤x≤1.2)的合成及电性质

周德凤1, 薄其兵2, 王秋艳3, 王敬平1, 吕敏峰1, 刘建芬1, 曹学强1, 邢献然4, 孟健1   

  1. 1. 中国科学院长春应用化学研究所稀土化学与物理重点实验室,长春130022;
    2. 济南大学化学化工学院,济南250000;
    3. 长春中医学院化学系,长春130000;
    4. 北京科技大学物理化学系,北京100083
  • 收稿日期:2004-12-27 出版日期:2005-10-10 发布日期:2005-10-10
  • 基金资助:

    国家自然科学基金(批准号:20271049,20331030)资助.

Synthesis and Electrical Properties of New Solid State Electrolyte Materials Ce6-xSmxMoO15-δ(0≤x≤1.2)

ZHOU De-Feng1, BO Qi-Bing2, WANG Qiu-Yan3, WANG Jing-Ping1, LV Min-Feng1, LIU Jian-Fen1, CAO Xue-Qiang1, XING Xian-Ran4, MENG Jian1   

  1. 1. Key Laboratory of Rare Earth Chemistry and Physics,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China;
    2. College of Chemistry and Chemical Engineering,Jinan University,Jinan 250000,China;
    3. Department of Chemistry,Changchun College of Chinese Medicine,Changchun 130000,China;
    4. Department of Physical Chemistry,Beijing University of Science & Technology,Beijing 100083,China
  • Received:2004-12-27 Online:2005-10-10 Published:2005-10-10

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摘要： 采用溶胶-凝胶方法合成系列新型氧化物Ce6-xSmxMoO15-δ(0≤x≤1.2).通过TG-DTA,XRD和XPS等手段对氧化物结构进行了表征.结果表明,氧化物的最低成相温度为400℃,具有立方莹石结构.Sm的掺杂可增加氧离子空位浓度,改善母体电导率.阻抗谱表明,采用溶胶-凝胶法合成固体电解质可减少或消除其晶界电阻.800℃时,Ce5.2Sm0.8MoO15-δ的电导率高达6.67×10-3S/cm.

关键词: 固体电解质, 电导率, 溶胶-凝胶法, SOFCs

Abstract: A new solid electrolyte series of oxides Ce6-xSmxMoO15-δ(0≤x≤1.2) were synthesized by sol-gel method.The precursors and the resultant oxide powders were characterized by differential thermal analysis/thermogravimetry(DTA/TG),X-ray Diffraction(XRD) and X-ray Photoelectron Spectroscopy(XPS).The formation temperature of the compounds was found to be as low as 400 ℃.Ce6-xSmxMoO15-δ crystallized to fluorite-related cubic structure.The electrical conductivity of samples was investigated by using AC impedance spectroscopy.Impedance spectra analyses show that the grain-boundary resistance of the solid electrolyte prepared by sol-gel method wad reduced or even eliminated.It shows that the presence of Sm is related with the oxygen-ion conductivity.The highest oxygen-ion conductivity is found in Ce6-xSmxMoO15-δ(x=0.8) reaching 6.67×10-3 S/cm at 800 ℃. The Ce6-xSmxMoO15-δionic conductor shows a potential application in the intermediate-temperature solid oxide fuel cells(SOFCs).

Key words: Solid state electrolyte, Conductivity, Sol-gel method, SOFCs

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