| 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 |
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| ABSTRACT |
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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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