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Conference paper · Journal article

Anode Supported Solid Oxide Fuel Cells - Deconvolution of Degradation into Cathode and Anode Contributions

By Hagen, Anke1,2,3; Liu, Yi-Lin2,3,4; Barfod, Rasmus5; Hendriksen, Peter Vang2,3,6

From

Electrochemical Evaluation, Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark1

Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark2

Risø National Laboratory for Sustainable Energy, Technical University of Denmark3

Microstructures and Interfaces, Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark4

Haldor Topsoe AS5

Electroceramics, Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark6

The degradation of anode supported cells was studied over 1500 h as function of cell polarization either in air or oxygen on the cathode. Based on impedance analysis, contributions of anode and cathode to the increase of total resistance were assigned. Accordingly, the degradation rates of the cathode were strongly dependent on the pO(2); they were significantly smaller when testing in oxygen compared to air.

Microstructural analysis of the cathode/electrolyte interface of a not-tested reference cell carried out after removal of the cathode showed sharp craters on the electrolyte surface where the LSM particles had been located. After testing in air, these craters flattened out and decreased in size, indicating the decrease of three phase boundary length.

In contrast, they remained almost unchanged after testing in oxygen giving an explanation for the observed smaller - mainly anode related degradation rate.

Language: English
Publisher: The Electrochemical Society
Year: 2007
Pages: 301-309
Proceedings: 10th International symposium on solid oxide fuel cells
ISSN: 19386737 and 19385862
Types: Conference paper and Journal article
DOI: 10.1149/1.2729105
ORCIDs: Hagen, Anke and Hendriksen, Peter Vang

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