Interactions of nickel/zirconia solid oxide fuel cell anodes with coal gas containing arsenic

C. A. Coyle, O. A. Marina, E. C. Thomsen, D. J. Edwards, C. D. Cramer, G. W. Coffey, L. R. Pederson

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The performance of anode-supported and electrolyte-supported solid oxide fuel cells was investigated in synthetic coal gas containing 0-10 ppm arsenic at 700-800 °C. Arsenic was found to interact strongly with nickel, resulting in the formation of nickel-arsenic solid solution, Ni5As2 and Ni11As8, depending on temperature, arsenic concentration, and reaction time. For anode-supported cells, loss of electrical connectivity in the anode support was the principal mode of degradation, as nickel was converted to nickel arsenide phases that migrated to the surface to form large grains. Cell failure occurred well before the entire anode was converted to nickel arsenide, and followed a reciprocal square root of arsenic partial pressure dependence that is consistent with a diffusion-based rate-limiting step. Failure occurred more quickly with electrolyte-supported cells, which have a substantially smaller nickel inventory. For these cells, time to failure varied linearly with the reciprocal arsenic concentration. Failure occurred when arsenic reached the anode/electrolyte interface, though agglomeration of nickel reaction products may have also contributed. Test performed with nickel/zirconia coupons showed that arsenic was essentially completely captured in a narrow band near the fuel gas inlet. Arsenic concentrations of ∼10 ppb or less are estimated to result in acceptable rates of fuel cell degradation.

Original languageEnglish
Pages (from-to)730-738
Number of pages9
JournalJournal of Power Sources
Volume193
Issue number2
DOIs
Publication statusPublished - 5 Sep 2009
Externally publishedYes

Fingerprint

cell anodes
Coal gas
Arsenic
solid oxide fuel cells
Solid oxide fuel cells (SOFC)
Nickel
zirconium oxides
arsenic
Zirconia
coal
Anodes
nickel
gases
interactions
anodes
Electrolytes
electrolytes
cells
degradation
zirconium oxide

Keywords

  • Anode
  • Arsenic
  • Coal gas
  • Degradation
  • Nickel
  • SOFC

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry

Cite this

Coyle, C. A., Marina, O. A., Thomsen, E. C., Edwards, D. J., Cramer, C. D., Coffey, G. W., & Pederson, L. R. (2009). Interactions of nickel/zirconia solid oxide fuel cell anodes with coal gas containing arsenic. Journal of Power Sources, 193(2), 730-738. https://doi.org/10.1016/j.jpowsour.2009.04.042

Interactions of nickel/zirconia solid oxide fuel cell anodes with coal gas containing arsenic. / Coyle, C. A.; Marina, O. A.; Thomsen, E. C.; Edwards, D. J.; Cramer, C. D.; Coffey, G. W.; Pederson, L. R.

In: Journal of Power Sources, Vol. 193, No. 2, 05.09.2009, p. 730-738.

Research output: Contribution to journalArticle

Coyle, CA, Marina, OA, Thomsen, EC, Edwards, DJ, Cramer, CD, Coffey, GW & Pederson, LR 2009, 'Interactions of nickel/zirconia solid oxide fuel cell anodes with coal gas containing arsenic', Journal of Power Sources, vol. 193, no. 2, pp. 730-738. https://doi.org/10.1016/j.jpowsour.2009.04.042
Coyle, C. A. ; Marina, O. A. ; Thomsen, E. C. ; Edwards, D. J. ; Cramer, C. D. ; Coffey, G. W. ; Pederson, L. R. / Interactions of nickel/zirconia solid oxide fuel cell anodes with coal gas containing arsenic. In: Journal of Power Sources. 2009 ; Vol. 193, No. 2. pp. 730-738.
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