NDLI: Assessment of doped ceria as electrolyte

Content Provider	Springer Nature Link
Author	Dalslet, Bjarke Blenw, Peter Hendriksen, Peter Vang Bonas, Nikolaos Lybye, Dorthe Mogensen, Mogens
Copyright Year	2006
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 $${\left( {{\text{La}}_{{0.6}} {\text{Sr}}_{{0.4}} } \right)}_{z} {\text{Co}}_{{0.2}} {\text{Fe}}_{{0.8}} {\text{O}}_{{3 \, - \, \delta}}$$ -CG10 cathodes on CG10 compared to the (La0.75Sr0.25)0.95MnO3 cathodes on stabilized zirconia.
Starting Page	547
Ending Page	561
Page Count	15
File Format	PDF
ISSN	14328488
Journal	Journal of Solid State Electrochemistry
Volume Number	10
Issue Number	8
e-ISSN	14330768
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-05-13
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Electrolytes Electrochemistry Fuel cells Electronic and Computer Engineering Condensed Matter Characterization and Evaluation Materials Industrial Chemistry/Chemical Engineering Analytical Chemistry Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science Electrical and Electronic Engineering Electrochemistry

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