高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

新型固体电解质Ce5.2RE0.8MoO15-δ 的合成及电性质

周德凤1,2, 郭微2, 葛志敏2, 郝险峰1, 柴平1, 曹学强1, 邢献然3, 孟健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. 长春工业大学生物工程学院, 长春 130012;
    3. 北京科技大学物理化学系, 北京100083
  • 收稿日期:2006-03-23 修回日期:1900-01-01 出版日期:2007-02-10 发布日期:2007-02-10
  • 通讯作者: 孟健

Synthesis and Electrical Properties of New Solid State Electrolyte Materials Ce5.2RE0.8MoO15-δ

ZHOU De-Feng1,2, GUO Wei2,GE Zhi-Min2, HAO Xian-Feng1, CAI Ping1,
CAO Xue-Qiang1,XING Xian-Yan3, MENG Jian1   

    1. Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
    2. School of Biological Engineering, Changchun University of Technology, Changchun 130012, China;
    3. Department of Physical Chemistry, Beijing University of Scitnce & Technology, Beijing 100083, China
  • Received:2006-03-23 Revised:1900-01-01 Online:2007-02-10 Published:2007-02-10
  • Contact: MENG Jian

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摘要： 采用溶胶-凝胶方法合成了系列新型氧化物Ce5.2RE0.8MoO15-δ(RE=Ce, Y, La, Sm, Gd, Dy, Ho, Er). 通过XRD, Raman和XPS等手段对氧化物的结构进行了表征, 采用交流阻抗谱测试其导电性能. 研究结果表明, RE3+的掺杂可增加氧离子的空位浓度, 改善母体电导率, 晶胞参数随RE3+半径的增大而增大. 掺杂离子Dy3+的半径(0.0908 nm) 与母体基质离子Ce4+的半径(0.0920 nm) 相近, 形成的掺杂氧化物晶格弹性应变最小, RE3+与氧空位间的缔合焓(ΔHA)最小, 因而氧化物Ce5.2Dy0.8MoO15-δ具有相对较高的电导率(7.02×10-3 S/cm)和较低的激活能(1.056 eV).

关键词: 固体电解质, 电导率, 溶胶-凝胶法, 固体氧化物燃料电池

Abstract: A series of solid state electrolytes, Ce5.2RE0.8MoO15-δ(RE=Y, La, Sm, Gd, Dy, Ho, Er), were synthesized by sol-gel method. Their structures and electrical conductivities were characterized by X-ray Diffraction(XRD), Raman and X-ray Photoelectron Spectroscopy(XPS) and AC impedance spectroscopy, respectively. The results show that the concentrations of oxygen vacancy increased with increasing x and their conductivity were improved. And the cell parameters increase as the radius of RE3+ increases. Because the ionic radius of doped Dy3+(0.0908 nm) is closed to that of Ce4+(0.0920 nm), their oxide has minimal cell elastic straining between RE3+and oxygen vacancy, and the system has the least association enthalpy, thus the oxide Ce5.2RE0.8MoO15-δ exhibits a higher conductivity(7.02×10-3 S/cm) and lower activation energy(1.056 eV) compared to the other doped compounds.

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

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