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J. Korean Ceram. Soc. > Volume 52(6); 2015 > Article
Journal of the Korean Ceramic Society 2015;52(6): 527.
doi: https://doi.org/10.4191/kcers.2015.52.6.527
Protonic Conduction Properties of Nanostructured Gd-doped CeO2 at Low Temperatures
Hee Jung Park, Jae Soo Shin, Yong Ho Choa1, Han Bok Song1, Ki Moon Lee2, Kyu Hyoung Lee3
Dep. of Advanced Materials Engineering, Daejeon University
1Dep. of Chemical Engineering, Hanyang University
2Dep. of Physics, Kunsan Nat. University
3Dep. of Nano Applied Engineering, Kangwon Nat. University
The electrical properties of nanostructured Gd-doped $CeO_2$ (n-GDC) as a function of temperature and water partial-pressure were investigated using ac and dc measurements. For n-GDC, protonic conductivity prevails under wet condition and at low temperatures (< $200^{circ}C$), while oxygen ionic conductivity occurs at high temperatures (> $200^{circ}C$) under both dry and wet conditions. The grain boundaries in n-GDC were highly selective, being conductive for protonic transport but resistive for oxygen ionic transport. The protonic conductivity reaches about $4{times}10^{-7}S/cm$ at room temperature (RT).
Key words: Nanostructure, Protonic conductor, Ceria
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