Journal article
Enhancement of the chemical stability in confined δ-Bi2O3
Department of Energy Conversion and Storage, Technical University of Denmark1
Electrofunctional materials, Department of Energy Conversion and Storage, Technical University of Denmark2
Ceramic Engineering & Science, Department of Energy Conversion and Storage, Technical University of Denmark3
Imaging and Structural Analysis, Department of Energy Conversion and Storage, Technical University of Denmark4
Applied Electrochemistry, Department of Energy Conversion and Storage, Technical University of Denmark5
Center for Electron Nanoscopy, Technical University of Denmark6
Aarhus University7
Bismuth-oxide-based materials are the building blocks for modern ferroelectrics1, multiferroics2, gas sensors3, light photocatalysts4 and fuel cells5,6. Although the cubic fluorite δ-phase of bismuth oxide (δ-Bi2O3) exhibits the highest conductivity of known solid-state oxygen ion conductors5, its instability prevents use at low temperature7–10.
Here we demonstrate the possibility of stabilizing δ-Bi2O3 using highly coherent interfaces of alternating layers of Er2O3-stabilized δ-Bi2O3 and Gd2O3-doped CeO2. Remarkably, an exceptionally high chemical stability in reducing conditions and redox cycles at high temperature, usually unattainable for Bi2O3-based materials, is achieved.
Even more interestingly, at low oxygen partial pressure the layered material shows anomalous high conductivity, equal or superior to pure δ-Bi2O3 in air. This suggests a strategy to design and stabilize new materials that are comprised of intrinsically unstable but high-performing component materials.
Language: | English |
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Publisher: | Nature Publishing Group UK |
Year: | 2015 |
Pages: | 500-504 |
ISSN: | 14764660 and 14761122 |
Types: | Journal article |
DOI: | 10.1038/nmat4266 |
ORCIDs: | 0000-0001-6805-1232 , Esposito, Vincenzo , Andreasen, Jens Wenzel , Hjelm, Johan , Kasama, Takeshi , Simonsen, Søren Bredmose , Linderoth, Søren and Pryds, Nini |