On the proton conductivity in pure and gadolinium doped nanocrystalline cerium oxide

Mona Shirpour; Giuliano Gregori; Rotraut Merkle; Joachim Maier

doi:10.1039/C0CP01702G

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Physical Chemistry Chemical Physics

Issue 3, 2011

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On the proton conductivity in pure and gadolinium doped nanocrystalline cerium oxide

Mona Shirpour,^a Giuliano Gregori,*^a Rotraut Merkle^a and Joachim Maier^a

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Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany
E-mail: g.gregori@fkf.mpg.de ;
Fax: +49 711-689-1722 ;
Tel: +49 711-689-1770

Phys. Chem. Chem. Phys., 2011,13, 937-940

DOI: 10.1039/C0CP01702G
Received 03 Sep 2010, Accepted 10 Nov 2010
First published online 25 Nov 2010

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Abstract
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Conductivity measurements were performed on microcrystalline and nanocrystalline ceria (undoped and doped) in dry as well as wet atmosphere. Below 200–250 °C, the nanocrystalline samples exhibit an enhanced total conductivity under wet conditions, which increases with decreasing temperature. In addition, thermo-gravimetric analysis revealed a strong water uptake below 200 °C. DC-polarization measurements confirm the ionic character of conductivity in the nanocrystalline samples at low temperatures. The role of both grain boundaries and residual porosity on the enhanced conductivity below 200 °C is discussed.

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Electron microscopy characterization, pore size distribution analysis (nanocrystalline vs. microcrystalline, AC-impedance spectra, and oxygen partial pressure dependence of the conductivity
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