Solid oxide fuel cell performance under severe operating conditions

Publication: Research - peer-reviewConference article – Annual report year: 2006

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The performance and degradation of Solid Oxide Fuel Cells (SOFC) were studied under severe operating conditions. The cells studied were manufactured in a small series by ECN, in the framework of the EU funded CORE-SOFC project. The cells were of the anode-supported type with a double layer LSM cathode. They were operated at 750 °C or 850 °C in hydrogen with 5% or 50% water at current densities ranging from 0.25 A cm–2 to 1 A cm–2 for periods of 300 hours or more. The area specific cell resistance, corrected for fuel utilisation, ranged between 0.20 Ω cm2 and 0.34 Ω cm2 at 850 °C and 520 mV, and between 0.51 Ω cm2 and 0.92 Ω cm2 at 750 °C and 520 mV.

The degradation of cell performance was found to be low (ranging from 0 to 8%/1,000 hours) at regular operating conditions. Voltage degradation rates of 20 to 40%/1,000 hours were observed under severe operating conditions, depending on the test conditions.

Data analysis revealed a critical cell voltage of ca 750 mV, above which the degradation rates were trivial, but below which they were significant.

Some cells were also tested using a different procedure to that usually applied at Risø. This gave a different aging behaviour, indicating that the detailed test circumstances may be decisive to the outcome.

Original languageEnglish
JournalFuel Cells
Publication date2006
Volume6
Issue2
Pages130-136
ISSN1615-6846
DOIs
StatePublished

Conference

Conference6th European Solid Oxide Fuel Cell Forum
Number6
CountrySwitzerland
CityLucerne
Period28/06/0402/07/04
Internet addresshttp://www.efcf.com/past/
CitationsWeb of Science® Times Cited: 25

Keywords

  • Accelerated test, Anode, Cathode activation, Degradation, Impedance spectroscopy, SOFC
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