Effect of Humidity in Air on Performance and Long-Term Durability of SOFCs

Publication: Research - peer-reviewConference article – Annual report year: 2009

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Anode supported SOFCs based on Ni-YSZ anodes, YSZ electrolytes, and LSM-YSZ cathodes were studied with respect to durability in humid air (~4%) over typically 1500 hours. Operating temperature and current density were varied between 750 and 850 oC and 0.25-0.75 A/cm2, respectively. It was found that the introduction of humidity affected the cell voltage under polarization of the cell and that this effect was (at least partly) reversible upon switching off the humidity, probably related to a segregation of impurities towards the three phase boundary in the presence of humidity. Generally, the studied cells were successfully operated in humid air under technologically relevant conditions. Improvements at the cathode/electrolyte interface made it possible to obtain highly stable cells, which can be operated under high current density and at 750 oC in humid air - conditions that are known to cause significant cell voltage degradation in dry air.
Original languageEnglish
JournalE C S Transactions
Publication date2009
Volume25
Journal number2
Pages439-446
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).

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Keywords

  • Solid Oxide Fuel Cells, Fuel Cells and hydrogen
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