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Acta Chimica Sinica ›› 2007, Vol. 65 ›› Issue (14): 1313-1317. Previous Articles     Next Articles

Original Articles

Pr掺杂对Ce5.2Sm0.8MoO15－δ晶界及电性能的影响

周德凤*,1, 郭微1, 朱建新1, 郝险峰2, 葛志敏1, 叶俊峰1, 孟健2   

  1. (1长春工业大学生物工程学院 长春 130012)
    (2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)
  • 投稿日期:2006-11-14 修回日期:2007-01-15 发布日期:2007-07-28
  • 通讯作者: 周德凤

Effects of Pr Dopant on Grain Boundary and Electrical Properties of Ce5.2Sm0.8MoO15－δ

ZHOU De-Feng*,1; GUO Wei1; ZHU Jian-Xin1; HAO Xian-Feng2; GE Zhi-Min1; YE Jun-Feng1; MENG Jian2   

  1. (1 School of Biological Engineering, Changchun University of Technology, Changchun 130012)
    (2 Key Laboratory of Rare Earth Chemistry and Physics, Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022)
  • Received:2006-11-14 Revised:2007-01-15 Published:2007-07-28
  • Contact: ZHOU De-Feng

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Material formulated as Ce5.2Sm0.8－xPrxMoO15－δ (x＝0.08) was prepared by adding small amounts of Pr dopant in oxide Ce5.2Sm0.8－xPrxMoO15－δ. Structural and electrical properties were investigated by means of X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM) and AC impedance spectroscopy. The effect of small amounts of Pr on microstructure and electrical conductivity was discussed. It was showed that the material doped with Pr has a lot of dents and small openings, which provide channels for oxygen ions, resulting in lower grain boundary and total conductivity activation energy. Thus the corresponding grain boundary conductivity and total conductivity of the material were improved notably. The grain boundary conductivity of the material doped with Pr is 6.79×10－3 S•cm－1 at 500 ℃, which is twice as large as that without Pr (5.61×10－5 S•cm－1).

Key words: solid state electrolyte, conductivity, grain boundary, solid oxide fuel cell