On the Conductivity Mechanism of Nanocrystalline Ceria
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- 1 January 2002
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 149 (10) , J73-J83
- https://doi.org/10.1149/1.1507597
Abstract
Electrical conductivities of Gd-doped (0.15 mol %) and nominally pure nanocrystalline CeO2−xCeO2−x ceramics (∼30 nm grain size) were measured by impedance spectroscopy in the temperature range of 673-773 K under various oxygen partial pressures (1- 105105 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 ∼0.3 V resulting in depletion of oxygen vacancies and accumulation of conduction electrons) explains all the experimental features. © 2002 The Electrochemical Society. All rights reserved.Keywords
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