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Impedance spectra of a symmetrical cell with SOFC cathodes (LSM-YSZ/YSZ/LSM-YSZ) and an anode supported planar SOFC (Ni-YSZ/YSZ/LSM-YSZ) were collected at OCV at 650{degree sign}C in air (cathode) and humidified (4%) hydrogen (anode), over 155 hours. The impedance was affected by degradation over time in the same frequency range for both cells (~10 Hz), possibly indicating that the same physical process was affected in both types of cell. However, deconvolution of the impedance data was not straightforward. When n-values of the constant phase elements in the otherwise identical equivalent circuit for the full cell were changed slightly, very different results were obtained, showing the high sensitivity of the fitting procedure. Therefore, the equivalent circuit applied should be refined further, requiring comparison of impedance data of the cells at higher temperature (750, 850{degree sign}C).
Original languageEnglish
JournalE C S Transactions
Publication date2009
Volume25
Issue2
Pages489-498
ISSN1938-5862
DOIs
StatePublished

Conference

Conference216th ECS Meeting
Number216
CountryAustria
CityVienna
Period04/10/0909/10/09
Internet addresshttp://www.electrochem.org/meetings/biannual/216/216.htm

Bibliographical note

Copyright The Electrochemical Society, Inc. [2009]. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS).

CitationsWeb of Science® Times Cited: No match on DOI

Keywords

  • Solid Oxide Fuel Cells, Fuel Cells and hydrogen
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