Nano-sized Pr0.8Sr0.2Co1-xFe xO3powders prepared by single-step combustion synthesis for solid oxide fuel cell cathodes

Edoardo Magnone*, Enrico Traversa, Masaru Miyayama

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Different sets of perovskite-type oxides of general formula Pr 0.8Sr 0.2Co 1-xFe xO 3-δ (x=0.0, 0.2, 0.5, 0.8 and 1.0) were successfully prepared by low-cost single-step combustion synthesis at low temperatures based on the auto-ignition reaction of a nitrate solution in the presence of citric acid. Thermogravimetric and differential thermal analysis was carried out on nitrate-citrate precursors to determine the perovskite-phase formation process. The results revealed that the nitrate-citrate precursor exhibited self-propagating combustion behavior. Pr 0.8Sr 0.2Co 1-x Fe xO 3-δ powders showed an orthorhombic single-phase, with their unit cell volume increasing as a function of the Fe content (x). Scanning electron microscopy observations showed that the prepared powders were nanocrystalline. The Pr 0.8Sr 0.2Co 1-xFe xO 3-δ powders were characterized as fuel cell electrodes on Ce 0.8Sm 0.2O 2-δ pellets in symmetri-cal cells, and the electrochemical properties of the elec-trode/electrolyte interfaces were investigated using electrochemical impedance spectroscopy (EIS) as a func-tion of the temperature, Fe content (x) and oxygen partial pressure.

Original languageEnglish (US)
Pages (from-to)122-135
Number of pages14
JournalJournal of Electroceramics
Volume24
Issue number2
DOIs
StatePublished - Apr 1 2010

Keywords

  • Combustion synthesis
  • Effect of fe content
  • Electrochemical characterization
  • Nanomaterials
  • Praseodymium

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Materials Chemistry
  • Electrical and Electronic Engineering

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