物理化学学报 >> 2009, Vol. 25 >> Issue (11): 2211-2217.doi: 10.3866/PKU.WHXB20091132

研究论文 上一篇    下一篇

Ca、Ba掺杂Sm0.5Sr0.5CoO3作为中低温固体氧化物燃料电池阴极的结构与性能

朱承飞, 王刚, 薛金花, 欧阳平凯   

  1. 南京工业大学材料科学与工程学院, 南京 210009|南京工业大学生物与制药工程学院, 南京 210009
  • 收稿日期:2009-06-12 修回日期:2009-09-02 发布日期:2009-10-28
  • 通讯作者: 朱承飞 E-mail:zhucf@njut.edu.cn

Structure and Performance of Ca, Ba Doping Sm0.5Sr0.5CoO3 Cathode for Intermediate Temperature-Solid Oxide Fuel Cells

ZHU Cheng-Fei, WANG Gang, XUE Jin-Hua, OUYANG Ping-Kai   

  1. College of Materials Science &Engineering, Nanjing University of Technology, Nanjing 210009, P. R. China|College of |Biotechnology and Pharmaceutical Engineering, Nanjing University of Technology, Nanjing 210009|P. R. China
  • Received:2009-06-12 Revised:2009-09-02 Published:2009-10-28
  • Contact: ZHU Cheng-Fei E-mail:zhucf@njut.edu.cn

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摘要：

通过X射线衍射(XRD)、热重、热膨胀、电导率以及电化学交流阻抗等测试技术研究了SmSr1-xAexCo2O6(x=0, 0.2, 0.4, 0.6, 0.8, 1; Ae=Ca, Ba)作为中低温固体氧化物燃料电池(IT-SOFC)阴极的结构与性能. 研究表明, 固相法合成的SmSr0.8Ae0.2Co2O6(Ae=Ca, Sr, Ba; 简写为SSAC)随着Ca、Ba掺杂量的增大晶体结构发生变化. 其中, 空间群为Pnma晶体结构的电极SSAC中, 晶胞参数随着Sr、Ca、Ba的顺序增大; SSAC晶体中的氧空位浓度随着Ca、Sr、Ba的顺序增大, SSAC热膨胀系数与Ae元素关系不大, 氧催化性能随着Ca、Sr、Ba的顺序降低. 由于载流子浓度降低, 使得Ba 掺杂Sm0.5Sr0.5CoO3(SSC)后电极的电导率降低. 由于导电活化能增大, 使得Ca掺杂SSC后电极的电导率也降低.

关键词: 阴极材料, IT-SOFC, SmSr1-xAexCo2O6, 结构, 性能

Abstract:

The structure and performance of SmSr1-xAexCo2O6 (x=0, 0.2, 0.4, 0.6, 0.8, 1; Ae=Ca, Ba) as intermediate temperature-solid oxide fuel cell (IT-SOFC) cathodes were investigated by X-ray diffraction (XRD), thermogravimetry (TG), thermal expansion, electrical conductivity, and electrochemical impedance spectroscopy (EIS). The SmSr1-xAexCo2O6 system's structure changes as x increases from 0 to 1. The SmSr0.8Ae0.2Co2O6 (SSAC; Ae=Ca, Sr, Ba) system has an orthorhombic structure with a Pnma space group. The crystal parameter of SSAC increases in the following order: Sr

Key words: Cathode material, IT-SOFC, SmSr1-xAexCo2O6, Structure, Performance