Enhanced ionic conductivity of Sm0.2Ce0.8O2?em class="a-plus-plus">δ electrolyte for solid oxide fuel cells through doping transition metals

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• 作者：Guixiang Hua ; Xifeng Ding ; Wenliang Zhu…
• 刊名：Journal of Materials Science: Materials in Electronics
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：26
• 期：6
• 页码：3664-3669
• 全文大小：1,112 KB
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• 作者单位：Guixiang Hua (1)
  Xifeng Ding (1)
  Wenliang Zhu (1)
  Jianfei Li (1)
  
  1. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210009, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Optical and Electronic Materials
  Characterization and Evaluation Materials
  
• 出版者：Springer New York
• ISSN：1573-482X

文摘

Ceria-based electrolytes are considered as candidate electrolyte materials for intermediate temperature solid oxide fuel cells due to the high oxygen-ion conductivity. Lowing sintering temperature for ceria-based electrolyte is favorable for co-firing process as well as the reduction of fabrication cost. Transition metals (Fe, Co, Ni) were added to Sm-doped ceria (SDC) and the crystal structure, sintering performance and ionic conductivity were investigated by X-ray diffraction, SEM and AC impedance spectroscopy. The transition metal elements added to SDC as sintering aids reduced the sintering temperature of SDC electrolyte by 100-50?°C and the grain size decreased with increased doping amount of transition metals. The ionic conductivity, especially the grain-boundary conductivity was significantly improved by a small addition of transition metals. Among Fe, Co, Ni doped SDC electrolytes, the 0.01?mol Fe3+ doped SDC sintered at 1350?°C exhibited the highest ionic conductivity about 0.063?S?cm? at 800?°C and the lowest activation energy of 0.73?eV.