High Resolution TEM of Doped Ceria System
EMSL Project ID
29410
Abstract
Higher ionic conductive solid oxide electrolyte is critical for the realization of portable device based on solid oxide fuel cells (SOFCs). Doped ceria materials show promise owing to their higher ionic conductivity, and good thermodynamic stability in the fuel cell working environment. Our recent experimental results have shown that among doped ceria materials, SmxNdxCe1-2xO2- exhibits the highest grain ionic conductivity. The ionic conductivity of Sm0.075Nd0.075Ce0.85O2- was found to be 30% higher than that of Gd0.10Ce0.90O2- at 550oC. In order to investigate the conductivity enhancement in the co-doped materials, it is essential to investigate the dopant distribution inside the grain and across the grain boundaries. This is the main objective of the proposed work. Using high resolution transmission electron microscopy, energy electron loss spectroscopy and energy dispersive spectroscopy, it is possible to perform crystallographic and chemical analysis inside the grain and across the grain boundary. Further, the effect of various dopants on the grain boundary configuration and its relationship with the ionic conductivity will be investigated.
Project Details
Project type
Exploratory Research
Start Date
2008-03-17
End Date
2009-03-22
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members
Related Publications
Shobit Omar PhD Dissertation "ENHANCED IONIC CONDUCTIVITY OF CERIA-BASED COMPOUNDS FOR THE ELECTROLYTE APPLICATION IN SOFCS"