Operation of ceria-electrolyte solid oxide fuel cells on iso-octane-air fuel mixtures

Zhongliang Zhan, Scott A Barnett*

*Corresponding author for this work

Research output: Contribution to journalArticle

45 Scopus citations

Abstract

Reduced-temperature solid oxide fuel cells (SOFCs) - with thin Ce0.85Sm0.15O1.925 (SDC) electrolytes, thick Ni-SDC anode supports, and composite cathodes containing La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) and SDC - were fabricated and tested with iso-octane/air fuel mixtures. An additional supported catalyst layer, placed between the fuel stream and the anode, was needed to obtain a stable output power density (e.g. 0.6 W cm-2 at 590 °C) without anode coking. The Ru-CeO2 catalyst produced CO2 and H2 at temperatures <350 °C, while H2 and CO became predominant above 500 °C. Power densities were substantially less than for the same cells with H2 fuel (e.g. 1.0 W cm-2 at 600 °C), due to the dilute (≈20%) hydrogen in the fuel mixture produced by iso-octane partial oxidation. Electrochemical impedance analysis showed a main arc that represented ≈60% of the total resistance, and that increased substantially upon switching from hydrogen to iso-octane/air.

Original languageEnglish (US)
Pages (from-to)422-429
Number of pages8
JournalJournal of Power Sources
Volume157
Issue number1
DOIs
StatePublished - Jun 19 2006

Keywords

  • Catalyst
  • Hydrocarbons
  • Partial oxidation
  • Solid oxide fuel cells
  • iso-Octane

ASJC Scopus subject areas

  • Electrochemistry
  • Fuel Technology
  • Materials Chemistry
  • Energy (miscellaneous)

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