Mitigation of sulfur poisoning of Ni/Zirconia SOFC anodes by antimony and tin

Olga A. Marina, Christopher A. Coyle, Mark H. Engelhard, Larry R. Pederson

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Surface Sb/Ni and Sn/Ni alloys were found to efficiently minimize the negative effects of sulfur on the performance of Ni/zirconia anode-supported solid oxide fuel cells (SOFC). Prior to operating on fuel gas containing low concentrations of H2S, the nickel/ zirconia anodes were briefly exposed to antimony or tin vapor, which only slightly affected the SOFC performance. During the subsequent exposures to 1 and 5 parts per million H 2S, increases in anodic polarization losses were minimal compared to those observed for the standard nickel/zirconia anodes. Post-test x-ray photoelectron spectroscopy analyses showed that Sb and Sn tended to segregate to the surface of Ni particles, and further confirmed a significant reduction of adsorbed sulfur on the Ni surface in Ni-Sn and Ni-Sb samples compared to the Ni. The effect may be the result of weaker sulfur adsorption on bimetallic surfaces, adsorption site competition between sulfur and Sb or Sn on Ni, or other factors. The use of dilute binary alloys of Ni-Sb or Ni-Sn in the place of Ni, or brief exposure to Sb or Sn vapor, may be an effective means to counteract the effects of sulfur poisoning in SOFC anodes and Ni catalysts. Other advantages, including the suppression of coking, are also expected.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume158
Issue number4
DOIs
Publication statusPublished - 2011
Externally publishedYes

Fingerprint

cell anodes
Antimony
Tin
poisoning
solid oxide fuel cells
Solid oxide fuel cells (SOFC)
antimony
Sulfur
zirconium oxides
Zirconia
tin
Anodes
sulfur
anodes
Nickel
Vapors
nickel
Catalyst poisoning
vapors
Adsorption

ASJC Scopus subject areas

  • Electrochemistry
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics

Cite this

Mitigation of sulfur poisoning of Ni/Zirconia SOFC anodes by antimony and tin. / Marina, Olga A.; Coyle, Christopher A.; Engelhard, Mark H.; Pederson, Larry R.

In: Journal of the Electrochemical Society, Vol. 158, No. 4, 2011.

Research output: Contribution to journalArticle

Marina, Olga A. ; Coyle, Christopher A. ; Engelhard, Mark H. ; Pederson, Larry R. / Mitigation of sulfur poisoning of Ni/Zirconia SOFC anodes by antimony and tin. In: Journal of the Electrochemical Society. 2011 ; Vol. 158, No. 4.
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