Evidence of surface-reaction rate limitations in SOFC composite cathodes

Rainer Küngas, Fred Bidrawn, Eyas Mahmoud, John M. Vohs, Raymond J. Gorte

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)

Abstract

An analytical model has been developed and experimentally tested to determine the factors that lead to high overpotentials in composite solid oxide fuel cell (SOFC) cathodes. Results suggest that the performance of infiltrated, composite electrodes is limited by O 2 adsorption and incorporation into the perovskite lattice. The impedance of cathodes prepared by infiltration of La 0.8Sr 0.2FeO 3 (LSF) into porous yttria-stabilized zirconia (YSZ) depends strongly on the surface area of the perovskite phase and is independent of LSF film thickness. Model predictions about the effect of the microstructure and ionic conductivity of the porous electrolyte scaffold were also verified.

Original languageEnglish
Pages (from-to)146-150
Number of pages5
JournalSolid State Ionics
Volume225
DOIs
Publication statusPublished - Oct 4 2012
Externally publishedYes

Keywords

  • Cathode
  • Infiltration
  • LSF
  • Modeling
  • Solid oxide fuel cells
  • YSZ

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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