Interlayer-free nanostructured La0.58Sr0.4Co0.2 Fe0.8O3-δ cathode on scandium stabilized zirconia electrolyte for intermediate-temperature solid oxide fuel cells

Seungho Lee, Hwa Seob Song, Sang Hoon Hyun, Joosun Kim, Jooho Moon

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

LSCF powders with a specific surface area of 25.2 m2 g-1 and an average particle size of 89 nm are synthesized by the polymerizable complex method. The use of nanocrystalline LSCF powders allows the fabrication of an interlayer-free nanoporous cathode on top of an ScSZ electrolyte at a low temperature at which non-electrocatalytic secondary phases cannot form. The electrochemical performance of the interlayer-free cathode depends largely on the sintering temperature. A cathode sintered at below 750 °C lacks sufficient mechanical adhesion to the electrolyte, while the electrode surfaces are locally densified when sintered at above 800 °C. Impedance spectroscopy combined with microstructural evidence reveals that the optimum sintering temperature for LSCF is 750 °C. This avoids excess densification and grain growth, and results in the lowest polarization resistance (0.048 Ω cm2 at 750 °C).

Original languageEnglish
Pages (from-to)74-79
Number of pages6
JournalJournal of Power Sources
Volume187
Issue number1
DOIs
Publication statusPublished - 2009 Feb 1

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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