Electrochemical performance of (La, Sr)(Co, Fe)O3–(Ce, Gd)O3 composite cathodes

E. Perry Murray, M. J. Sever, S. A. Barnett

Research output: Contribution to journalArticle

573 Scopus citations

Abstract

La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) and LSCF-Ce0.8Gd0.2O3 (GDC) composite cathodes on YSZ electrolytes were studied for potential applications in low-temperature solid oxide fuel cells (SOFCs). Impedance spectroscopy measurements were performed in oxygen partial pressures ranging from 10-3 to 1 atm over a temperature range from 500 to 750 °C. The LSCF electrodes yielded low-current interfacial resistance values that were a factor of 10 lower than for (La, Sr)MnO3 cathodes. The addition of 50 vol.% GDC to LSCF resulted in an additional factor of ≈10 decrease in the polarization resistance. Polarization resistance values for the LSCF-GDC cathodes were as low as 0.01 Ω cm2 at 750 °C and 0.33 Ω cm2 at 600 °C.

Original languageEnglish (US)
Pages (from-to)27-34
Number of pages8
JournalSolid State Ionics
Volume148
Issue number1-2
DOIs
StatePublished - May 1 2002

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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