(La,Sr)MnO3-(Ce,Gd)O2-x composite cathodes for solid oxide fuel cells

E. Perry Murray, S. A. Barnett*

*Corresponding author for this work

Research output: Contribution to journalArticle

363 Scopus citations

Abstract

Impedance spectroscopy was used to measure the oxygen reaction kinetics of composite cathodes consisting of La0.8Sr0.2MnO3 (LSM) and Ce0.8Gd0.2O2-x (GDC) on yttria-stabilized zirconia (YSZ) and GDC electrolytes. The LSM-GDC electrodes are analogous to the widely used LSM-YSZ cathodes but have potential advantages since LSM is non-reactive with GDC and the ionic conductivity of GDC is higher than that of YSZ. LSM-GDC cathodes with 0-60 wt.% GDC were characterized over a temperature range of 600-750°C at oxygen partial pressures between 10-3 and 1 atm. Using YSZ electrolytes, the low-current interfacial resistance was smallest for 50 wt.% GDC, where the value was 0.49 Ω cm2 at 750°C. This is two to three times lower than that for LSM-YSZ composite cathodes on YSZ with similar structure. The majority of the LSM-GDC cathodes appeared to be limited by adsorption, as well as oxygen ion transfer into the electrolyte.

Original languageEnglish (US)
Pages (from-to)265-273
Number of pages9
JournalSolid State Ionics
Volume143
Issue number3-4
DOIs
StatePublished - Jul 2 2001

Keywords

  • Composite cathodes
  • Impedance spectroscopy
  • Solid oxide fuel cells

ASJC Scopus subject areas

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

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