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http://dx.doi.org/10.4191/kcers.2015.52.6.527

Protonic Conduction Properties of Nanostructured Gd-doped CeO2 at Low Temperatures  

Park, Hee Jung (Dep. of Advanced Materials Engineering, Daejeon University)
Shin, Jae Soo (Dep. of Advanced Materials Engineering, Daejeon University)
Choa, Yong Ho (Dep. of Chemical Engineering, Hanyang University)
Song, Han Bok (Dep. of Chemical Engineering, Hanyang University)
Lee, Ki Moon (Dep. of Physics, Kunsan Nat. University)
Lee, Kyu Hyoung (Dep. of Nano Applied Engineering, Kangwon Nat. University)
Publication Information
Journal of the Korean Ceramic Society / v.52, no.6, 2015 , pp. 527-530 More about this Journal
Abstract
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).
Keywords
Nanostructure; Protonic conductor; Ceria;
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