Protonic conduction properties of nanostructured Gd-doped CeO2 at low temperatures

초록

The electrical properties of nanostructured Gd-doped CeO<inf>2</inf> (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°C), while oxygen ionic conductivity occurs at high temperatures (> 200°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 × 10-7 S/cm at room temperature (RT).

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