On the conductivity mechanism of nanocrystalline ceria

Kim, S.; Maier, J.

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On the conductivity mechanism of nanocrystalline ceria

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Kim, S.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Maier, J.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Kim, S., & Maier, J. (2002). On the conductivity mechanism of nanocrystalline ceria. Journal of The Electrochemical Society, 149(10), J73-J83.

Cite as: https://hdl.handle.net/21.11116/0000-000E-E3ED-7

Abstract

Electrical conductivities of Gd-doped (0.15 mol %) and
nominally pure nanocrystalline CeO2-x ceramics (similar to30 nm
grain size) were measured by impedance spectroscopy in the

temperature range of 673-773 K under various oxygen partial
pressures (1-10(5) Pa). The ionic and electronic contributions
were separated using electrochemical polarization with an
electronically blocking electrode, yttria-stabilized zirconia.
The results allow for a clear distinction between potential
explanations. It is shown that the space charge model (space
charge zones with potential of similar to0.3 V resulting in
depletion of oxygen vacancies and accumulation of conduction
electrons) explains all the experimental features. (C) 2002 The
Electrochemical Society.