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, Joo Ho Moon

Research output: Contribution to journalArticle

25 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

Fingerprint

Scandium
scandium
solid oxide fuel cells
Solid oxide fuel cells (SOFC)
zirconium oxides
Zirconia
Electrolytes
interlayers
Cathodes
cathodes
electrolytes
sintering
Sintering
Nanocrystalline powders
densification
Grain growth
Densification
Specific surface area
Powders
Temperature

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

Cite this

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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).",
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Interlayer-free nanostructured La0.58Sr0.4Co0.2 Fe0.8O3-δ cathode on scandium stabilized zirconia electrolyte for intermediate-temperature solid oxide fuel cells. / Lee, Seungho; Song, Hwa Seob; Hyun, Sang Hoon; Kim, Joosun; Moon, Joo Ho.

In: Journal of Power Sources, Vol. 187, No. 1, 01.02.2009, p. 74-79.

Research output: Contribution to journalArticle

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AB - 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).

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