AI Article Synopsis
- Ceria co-doping (adding multiple elements to cerium oxide) is thought to enhance ionic conductivity beyond what single dopants achieve, leading to increased interest in this research area.
- This study uses computer simulations to analyze the ionic conductivity of ceria doped with various rare earth elements (like Sc, Gd, Sm, Nd, and La) and compares them with co-doped ceria (Nd/Sm and Sc/La).
- Findings suggest that the observed conductivity is influenced more by individual defects within the lattice rather than a beneficial synergistic effect from co-doping, resulting in no significant conductivity improvement in co-doped samples.
Article Abstract
Ceria (CeO2) co-doping has been suggested as a means to achieve ionic conductivities that are significantly higher than those in singly doped systems. Rekindled interest in this topic over the last decade has given rise to claims of much improved performance. The present study makes use of computer simulations to investigate the bulk ionic conductivity of rare earth (RE) doped ceria, where RE = Sc, Gd, Sm, Nd and La. The results from the singly doped systems are compared to those from ceria co-doped with Nd/Sm and Sc/La. The pattern that emerges from the conductivity data is consistent with the dominance of local lattice strains from individual defects, rather than the synergistic co-doping effect reported recently, and as a result, no enhancement in the conductivity of co-doped samples is observed.
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| http://dx.doi.org/10.1039/c4cp00856a | DOI Listing |
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