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Densification of Highly Defective Ceria by High Temperature Controlled Re-Oxidation

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Forfattere:
  • Ni, De Wei ;
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    Department of Energy Conversion and Storage, Technical University of Denmark
  • Glasscock, Julie ;
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    Department of Energy Conversion and Storage, Technical University of Denmark
  • Pons, Aénor ;
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    Electroceramics, Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark
  • Zhang, Wei ;
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    Department of Energy Conversion and Storage, Technical University of Denmark
  • Prasad, Aditya ;
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    Ceramic processing, Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark
  • Sanna, Simone ;
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    Department of Energy Conversion and Storage, Technical University of Denmark
  • Pryds, Nini ;
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    Orcid logo0000-0002-5718-7924
    Department of Energy Conversion and Storage, Technical University of Denmark
  • Esposito, Vincenzo
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    Orcid logo0000-0002-9817-7810
    Department of Energy Conversion and Storage, Technical University of Denmark
DOI:
10.1149/2.0121411jes
Resumé:
Highly enhanced densification and grain growth of Ce0.9Gd0.1O1.95-δ (CGO, gadolinium-doped ceria, with 10 mol% Gd) is achieved in low oxygen activity atmospheres. However, the material can suffer mechanical failures during cooling when the re-oxidation process is not controlled due to the large volume changes. In this work, the redox process of CGO is investigated using dilatometry, microscopy, electrochemical impedance spectroscopy and thermodynamic analysis. In addition, the conditions allowing controlled re-oxidation and cooling in order to preserve the mechanical integrity of the CGO component are defined: this can be achieved over a wide temperature range (800−1200◦C) by gradually increasing the oxygen content of the atmosphere. It is found that the electrical conductivity of the CGO, particularly at low temperature (<450◦C) is influenced by the sintering and controlled re-oxidation conditions. An increase in activation energy for conduction at low temperature is observed as the re-oxidation temperature decreases. Moreover it was observed that the ionic conductivity blocking effect, usually associated with grain boundary contributions, is not influenced by the grain size but rather by the chemical history of the material. © 2014 The Electrochemical Society.
Type:
Tidsskrift-artikel
Sprog:
Engelsk
Udgivet i:
Journal of the Electrochemical Society, 2014, Vol 161, Issue 11
Hovedforskningsområde:
Science/technology
Indberetningsår:
2014
ID:
271125774

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