Quantifying multi-ionic conduction through doped ceria-carbonate composite electrolyte by a current-interruption technique and product analysis

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• 作者：Yicheng Zhao ; Chun Xia ; Yujie Wang ; Zhuoran Xu ; Yongdan Li ; ^{ydli@tju.edu.cn}
• 关键词：Ionic conduction ; Composite electrolyte ; Samarium doped ceria ; Molten carbonate ; Intermediate temperature solid oxide fuel cell
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：May, 2012
• 卷：37
• 期：10
• 页码：8556-8561
• 文件大小：499 K

摘要

A composite electrolyte consisting of a samarium doped ceria and a binary eutectic carbonate phase is investigated in this work. It has been found that O^{2鈭?/sup>/H+ conductions take place when H₂ and O₂ used as the reactants. The presence of CO₂ in the cathode gas leads to the appearance of CO₃2鈭?/sup> conduction. The overall conductivity of the composite electrolyte is measured with a current-interruption technique and the ions transferred by O2鈭?/sup>/H+/CO₃2鈭?/sup> respectively are obtained by a quantitative measurement of the reaction products, i.e. H₂O and CO₂. The change of the carbonate content in the composite electrolyte presents a great influence on the conductivity of each ion. According to these experimental facts, the pathways for the individual ionic conductions are proposed.}