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Assessment of doped ceria as electrolyte

Dalslet, Bjarke ; Blennow Tullmar, Peter LU ; Vang Hendriksen, Peter ; Bonanos, Nikolaos ; Lybye, Dorthe and Mogensen, Mogens (2006) In Journal of Solid State Electrochemistry 10(8). p.547-561
Abstract
A model describing the performance of a fuel cell based on 10 mol% gadolinia-doped ceria, Ce0.9Gd0.1O1.95−x (CG10), was formulated. The total electrical conductivity of CG10 was measured under very reducing conditions in the temperature range of 753 K to 948 K. Oxygen permeation experiments were carried out to measure the leak current through a ceria electrolyte. The results of the measurements are compared with predictions of the formulated model. Furthermore, the response of a fuel cell to changing operating conditions such as external load, temperature, electrode polarization resistances, and defect chemistry is investigated using the model. It is found that the maximum achievable efficiency of a CG10-based fuel cell is increased when... (More)
A model describing the performance of a fuel cell based on 10 mol% gadolinia-doped ceria, Ce0.9Gd0.1O1.95−x (CG10), was formulated. The total electrical conductivity of CG10 was measured under very reducing conditions in the temperature range of 753 K to 948 K. Oxygen permeation experiments were carried out to measure the leak current through a ceria electrolyte. The results of the measurements are compared with predictions of the formulated model. Furthermore, the response of a fuel cell to changing operating conditions such as external load, temperature, electrode polarization resistances, and defect chemistry is investigated using the model. It is found that the maximum achievable efficiency of a CG10-based fuel cell is increased when (1) the temperature is decreased, when (2) the electrolyte thickness is increased, or when (3) the cathode polarization resistance is decreased. The efficiency can also in certain circumstances be increased by an increase of anode polarization resistance. Finally, the efficiency is reduced if the vacancy formation enthalpy is decreased to the level of fine-grained CG10. The performance of a CG10-based cell is evaluated by comparing it with a state-of-the-art zirconia-based cell. At 873 K, the efficiency of a fuel cell with a 10-μm CG10 electrolyte was limited to 0.74, whereas a cell with a perfect electrolyte would have an efficiency of 1. The power output of the CG10 cell at this efficiency is, however, four times larger than the zirconia-based cell at the same efficiency. This is due to the much lower cathode polarization resistance of (La0.6Sr0.4)zCo0.2Fe0.8O3-delta - CG10 cathodes on CG10 compared to the (La0.75Sr0.25)0.95MnO3 cathodes on stabilized zirconia. (Less)
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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Electrolytes, Fuel cells, Electrochemistry
in
Journal of Solid State Electrochemistry
volume
10
issue
8
pages
547 - 561
publisher
Springer
external identifiers
  • scopus:33745193292
ISSN
1433-0768
DOI
10.1007/s10008-006-0135-x
language
English
LU publication?
yes
additional info
The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Polymer and Materials Chemistry (LTH) (011001041)
id
b6c5ed84-1fe7-40da-8f59-c6abd3999879 (old id 638444)
date added to LUP
2016-04-01 12:28:42
date last changed
2021-05-19 01:59:29
@article{b6c5ed84-1fe7-40da-8f59-c6abd3999879,
  abstract     = {A model describing the performance of a fuel cell based on 10 mol% gadolinia-doped ceria, Ce0.9Gd0.1O1.95−x (CG10), was formulated. The total electrical conductivity of CG10 was measured under very reducing conditions in the temperature range of 753 K to 948 K. Oxygen permeation experiments were carried out to measure the leak current through a ceria electrolyte. The results of the measurements are compared with predictions of the formulated model. Furthermore, the response of a fuel cell to changing operating conditions such as external load, temperature, electrode polarization resistances, and defect chemistry is investigated using the model. It is found that the maximum achievable efficiency of a CG10-based fuel cell is increased when (1) the temperature is decreased, when (2) the electrolyte thickness is increased, or when (3) the cathode polarization resistance is decreased. The efficiency can also in certain circumstances be increased by an increase of anode polarization resistance. Finally, the efficiency is reduced if the vacancy formation enthalpy is decreased to the level of fine-grained CG10. The performance of a CG10-based cell is evaluated by comparing it with a state-of-the-art zirconia-based cell. At 873 K, the efficiency of a fuel cell with a 10-μm CG10 electrolyte was limited to 0.74, whereas a cell with a perfect electrolyte would have an efficiency of 1. The power output of the CG10 cell at this efficiency is, however, four times larger than the zirconia-based cell at the same efficiency. This is due to the much lower cathode polarization resistance of (La0.6Sr0.4)zCo0.2Fe0.8O3-delta - CG10 cathodes on CG10 compared to the (La0.75Sr0.25)0.95MnO3 cathodes on stabilized zirconia.},
  author       = {Dalslet, Bjarke and Blennow Tullmar, Peter and Vang Hendriksen, Peter and Bonanos, Nikolaos and Lybye, Dorthe and Mogensen, Mogens},
  issn         = {1433-0768},
  language     = {eng},
  number       = {8},
  pages        = {547--561},
  publisher    = {Springer},
  series       = {Journal of Solid State Electrochemistry},
  title        = {Assessment of doped ceria as electrolyte},
  url          = {http://dx.doi.org/10.1007/s10008-006-0135-x},
  doi          = {10.1007/s10008-006-0135-x},
  volume       = {10},
  year         = {2006},
}