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First-principles Study of Defect Migration in RE-doped Ceria (RE = Pr, Gd)

Published online by Cambridge University Press:  02 February 2011

Pratik Dholabhai ,
James Adams ,
Peter Crozier  and
Renu Sharma
Pratik Dholabhai
Affiliation:
Materials Science & Engineering, Arizona State University, Tempe, AZ 85287
James Adams
Affiliation:
Materials Science & Engineering, Arizona State University, Tempe, AZ 85287
Peter Crozier
Affiliation:
Materials Science & Engineering, Arizona State University, Tempe, AZ 85287
Renu Sharma
Affiliation:
Materials Science & Engineering, Arizona State University, Tempe, AZ 85287 Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899
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Abstract

Oxygen vacancy formation and migration in ceria is central to its performance as an ionic conductor. Ceria doped with suitable aliovalent dopants has enhanced oxygen ion conductivity – higher than that of yttria stabilized zirconia (YSZ), the most widely used electrolyte material in solid oxide fuel cells (SOFC). To gain insight into atomic defect migration in this class of promising electrolyte materials, we have performed total energy calculations within the framework of density functional theory (DFT+U) to study oxygen vacancy migration in ceria, Pr-doped ceria (PDC) and Gd-doped ceria (GDC). We report activation energies for various oxygen vacancy migration pathways in PDC and GDC. Results pertaining to the preferred oxygen vacancy formation sites and migration pathways in these materials will be discussed in detail. Overall, the presence of Pr and Gd ions significantly affects oxygen vacancy formation and migration, in a complex manner requiring the investigation of many different migration events. We propose a relationship that explains the role of additional dopants in lowering the activation energy for vacancy migration in PDC and GDC.

Keywords

ionic conductordiffusionsimulation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1311: Symposium GG – Next-Generation Fuel Cells—New Materials and Concepts , 2011 , mrsf10-1311-gg05-08
Copyright
Copyright © Materials Research Society 2011

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