Chemical degradation of La1-xSrxMnO 3/Y2O3-stabilized ZrO2 composite cathodes in the presence of current collector pastes

Christopher Chervin, Robert S. Glass, Susan M. Kauzlarich

Research output: Contribution to journalArticle

43 Scopus citations

Abstract

The chemical reactivity of current collector pastes, utilized in electrode performance measurements, were investigated with respect to the solid oxide fuel cell composite cathode, (La85Sr15).98MnO 3/8 mol% Y2O3-stabilized ZrO2 (LSM/YSZ). Anode substrate single cells were prepared with Pt or Ag paste current collectors applied to the electrodes. Phase purity of the cathodes before and after sintering the current collectors were examined with powder X-ray diffraction (XRD) and the performance of the cells determined with current-potential measurements. XRD experiments provided evidence that Pt paste, containing a bismuth flux, reacted with the composite cathode at temperatures above 800°C leading to formation of the pyrochlore phase, La 2Zr2O7. Cathodes coated with Ag paste, which did not contain a bismuth flux, showed no sign of chemical degradation. Synthesized Bi-subnitrate and commercial Bi2O3 were shown to have similar chemical reactions with LSM/YSZ powders leading to pyrochlore phase formation. Current-potential experiments on single test cells demonstrated that samples prepared with paste containing bismuth flux had a decrease in initial performance.

Original languageEnglish (US)
Pages (from-to)17-23
Number of pages7
JournalSolid State Ionics
Volume176
Issue number1-2
DOIs
StatePublished - Jan 14 2005

Keywords

  • Bi subnitrate
  • Bismuth oxide
  • Cathode
  • Current collector
  • Fuel cell
  • LaSrMnO
  • LaZrO
  • Lanthanum zirconate
  • LSM
  • SOFC
  • YSZ
  • ZrO

ASJC Scopus subject areas

  • Electrochemistry
  • Physical and Theoretical Chemistry
  • Energy Engineering and Power Technology
  • Materials Chemistry
  • Condensed Matter Physics

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