Electrochemical characterization of La0.6Ca0.4Fe0.8Ni0.2O3 cathode on Ce0.8Gd0.2O1.9 electrolyte for IT-SOFC

N. Ortiz-Vitoriano, C. Bernuy-Lopez, Anne Hauch, I. Ruiz de Larramendi, T. Rojo

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

For Solid Oxide Fuel Cells (SOFCs) to become an economically attractive energy conversion technology, suitable materials and structures which enable operation at lower temperatures, while retaining high cell performance, must be developed. Recently, the perovskitetype La0.6Ca0.4Fe0.8Ni0.2O3 oxide has shown potential as an intermediate temperature SOFC cathode. An equivalent circuit describing the cathode polarization resistances was constructed from analyzing impedance spectra recorded at different temperatures in oxygen. A competitive electrode polarization resistance is reported for this oxygen electrode using a Ce0.8Gd0.2O1.9 electrolyte, determined by impedance spectroscopy studies of symmetrical cells sintered at 800 _C and 1000 _C. Scanning electron microscopy (SEM) studies of the symmetrical cells revealed the absence of any reaction layer between cathode and electrolyte, and a porous electrode microstructure even when sintered at a temperature of only 800 _C. The performance of this cathode shows favorable oxygen reduction reaction (ORR) properties potentially making it an excellent choice for IT-SOFC application. © 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Original languageEnglish
JournalInternational Journal of Hydrogen Energy
Volume39
Pages (from-to)6675-6679
ISSN0360-3199
DOIs
Publication statusPublished - 2014

Keywords

  • Solid oxide fuel cell
  • Cathode
  • Perovskite
  • Mixed ionic electronic conductor
  • Electrochemical impedance spectroscopy
  • Microstructure

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