Durability of solid oxide fuel cells using sulfur containing fuels

Publication: Research - peer-reviewConference article – Annual report year: 2011

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The usability of hydrogen and also carbon containing fuels is one of the important advantages of solid oxide fuel cells (SOFCs), which opens the possibility to use fuels derived from conventional sources such as natural gas and from renewable sources such as biogas. Impurities like sulfur compounds are critical in this respect. State-of-the-art Ni/YSZ SOFC anodes suffer from being rather sensitive towards sulfur impurities. In the current study, anode supported SOFCs with Ni/YSZ or Ni/ScYSZ anodes were exposed to H2S in the ppm range both for short periods of 24h and for a few hundred hours. In a fuel containing significant shares of methane, the reforming activities of the Ni/YSZ and Ni/ScYSZ anodes were severely poisoned already at low H2S concentrations of ∼2ppm H2S. The poisoning effect on the cell voltage was reversible only to a certain degree after exposure of 500h in the state-of-the-art cell, due to a loss of percolation of Ni particles in the Ni/YSZ anode layers closest to the electrolyte. Using SOFCs with Ni/ScYSZ anodes improved the H2S tolerance considerably, even at larger H2S concentrations of 10 and 20ppm over a few hundred hours.
Original languageEnglish
JournalJournal of Power Sources
Publication date2011
Volume196
Issue17
Pages7271-7276
ISSN0378-7753
DOIs
StatePublished

Conference

Conference9th European Solid Oxide Fuel Cell Forum
Number9
CountrySwitzerland
CityLucerne
Period29/06/1002/07/10
Internet addresshttp://www.efcf.com/past/
CitationsWeb of Science® Times Cited: 23

Keywords

  • Solid Oxide Fuel Cells
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