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

De Wei Ni; Julie Glasscock; Aénor Pons; Wei Zhang; Aditya Prasad; Simone Sanna; Nini Pryds; Vincenzo Esposito

doi:10.1149/2.0121411jes

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

Forfattere:

Ni, De Wei ;
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Mixed Conductors, 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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Risø National Laboratory for Sustainable Energy, 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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0000-0002-5718-7924
Department of Energy Conversion and Storage, Technical University of Denmark
Esposito, Vincenzo
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0000-0002-9817-7810
Ceramic Engineering & Science, 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

Publikationsstatus:

Publiceret

Review type:

Peer Review

Indberetningsår:

2014

Videnskabeligt niveau:

Videnskabelig

ID:

271125774

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

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