NDLI: Search for new oxide-ion conducting materials in the ceria family of oxides

Content Provider	Springer Nature Link
Author	Devi, P. Sujatha Banerjee, S.
Copyright Year	2007
Abstract	We have adopted a modified combustion route, namely, a mixed fuel process (MFP) to prepare a novel series of nano-crystalline single- and multiple-doped ceria compositions with controlled powder characteristics, large surface area, finer particle size, high sinterability, and high oxide ion conductivity at intermediate temperatures (500–700 °C). Using the mixed fuel process, we have prepared nano-particles of single- and multiple-doped ceria powders with dopants such as Ca, Gd, and Sm and a suitable combination of the same. In the pursuit for identifying new oxide-ion-conducting materials in this family of oxides, we have pursued the idea of co-doping effect on the single doped compositions with proper introduction of a second dopant. Effect of these dopants on the thermal decomposition and physico–chemical characteristics of the precursor and the powders prepared thereby were studied in detail. Finally, the effects of multiple co-doping on the microstructural and electrical properties were compared to understand the origin of the effect of dopant characteristics on the oxide ion conductivity of Ce$_{1−x }$M$_{ x }$O$_{2}$ solid solutions. Our experimental results established unequivocally that co-doping is very effective in identifying new materials with remarkably high ionic conductivity with substantial reduction in the cost for technological applications. Among the studied compositions, the maximum conductivity with minimum activation energy was observed for the triply co-doped CCGS composition ( $$ {\sigma _{{600^\circ C}} = 6.750 \times 10^{{ - 2}} {\text{S}}} \mathord{\left/ {\vphantom {{\sigma _{{600^\circ C}} = 6.750 \times 10^{{ - 2}} {\text{S}}} {{\text{cm}}}}} \right. -} {{\text{cm}}} $$ ; E $_{a}$ = 0.56 eV), which is much higher compared to the conductivity exhibited by most of the reported co-doped ceria compositions. In conclusion, an effective way to improve the oxide ion conductivity of ceria-based oxides by proper choice of dopants and co-doping is achieved.
Starting Page	73
Ending Page	78
Page Count	6
File Format	PDF
ISSN	09477047
Journal	Ionics
Volume Number	14
Issue Number	1
e-ISSN	18620760
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-08-17
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ceria solid solutions Mixed fuel process Co-doping Oxide ion conductivity Electrical Power Generation and Transmission Renewable Energy Sources Condensed Matter Physical Chemistry Materials Science Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Engineering Materials Science Chemical Engineering

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