|About this Abstract
||Materials Science & Technology 2012
||International Symposium on Defects, Transport and Related Phenomena
||Discerning the Size Effects on the Ionic Conductivity of Doped Ceria
||Robert Kasse, Kevin S. Jones, Juan C. Nino
|On-Site Speaker (Planned)
||Juan C. Nino
Lowering the operating temperature of solid oxide fuel cells (SOFCs) for use at intermediate temperatures (400-800°C), is important for the expansion of SOFC technology into automotive applications. Several strategies (multi-doping, microstructure control, etc.) have been proposed to increase the electrolyte conductivity and avoid unacceptable ohmic losses at these lower temperatures. However, depending on the literature that is followed, it is still unclear whether grain size reduction is beneficial for enhancing the ionic conductivity in rare earth doped ceria or not. This may be because separating the contributions from the grain and grain boundaries is difficult for polycrystalline samples (bulk and film). Also, data from thin films with varying thicknesses have mainly been collected from surface measurements, where surface and fringing field effects poses problems. Here we present maiden comprehensive work on Ce<sub>0.9</sub>Nd<sub>0.1</sub>O<sub>2-δ</sub> bulk and thin film electrolytes in an attempt to discern the size effects on conductivity.