Durability of solid oxide fuel cells using sulfur containing fuels

Anke Hagen, Jens Foldager Bregnballe Rasmussen, Karl Tor Sune Thydén

    Research output: Contribution to journalConference articleResearchpeer-review

    Abstract

    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
    Volume196
    Issue number17
    Pages (from-to)7271-7276
    ISSN0378-7753
    DOIs
    Publication statusPublished - 2011
    Event9th European Solid Oxide Fuel Cell Forum - Lucerne, Switzerland
    Duration: 29 Jun 20102 Jul 2010
    Conference number: 9
    http://www.efcf.com/past/

    Conference

    Conference9th European Solid Oxide Fuel Cell Forum
    Number9
    CountrySwitzerland
    CityLucerne
    Period29/06/201002/07/2010
    Internet address

    Keywords

    • Solid Oxide Fuel Cells

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