Abstract
Spatial variability of conductivity in ceria is explored using scanning probe microscopy with galvanostatic control. Ionically blocking electrodes are used to probe the conductivity under opposite polarities to reveal possible differences in the defect structure across a thin film of CeO2. Data suggest the existence of a large spatial inhomogeneity that could give rise to constant phase elements during standard electrochemical characterization, potentially affecting the overall conductivity of films on the macroscale. The approach discussed here can also be utilized for other mixed ionic electronic conductor systems including memristors and electroresistors, as well as physical systems such as ferroelectric tunneling barriers.
Highlights
Spatial variability of conductivity in ceria is explored using scanning probe microscopy with galvanostatic control
The approach discussed here can be utilized for other mixed ionic electronic conductor systems including memristors and electroresistors, as well as physical systems such as ferroelectric tunneling barriers
Coupling between electronic and ionic transport in solid oxides underpins an immense range of energy storage and conversion technologies
Summary
Spatial variability of conductivity in ceria is explored using scanning probe microscopy with galvanostatic control.
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