Phase stability of Sm 0.5 Sr 0.5 CoO 3 cathodes for on-planar type, single-chamber, solid oxide fuel cells

Hwa Seob Song, Ji Hyun Min, Joosun Kim, Joo Ho Moon

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The stability of Sm 0.5 Sr 0.5 CoO 3 (SSC) under reduction conditions is investigated to determine whether it can be used as a cathode material in on-planar type, single-chamber, solid oxide fuel cells. The techniques of X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy are used to reveal the reduction mechanism of SSC. Impedance spectroscopy analysis also provides a better understanding of the influence of decomposed SSC phases on cathode performance. Decomposition of SSC occurs on the surface by the formation of dot-shaped SrO, Co(OH) 2 and CoO on top of the reduced SSC layer at 250 °C in 4% H 2 O-96% H 2 . The SSC perovskite structure is destroyed at 350 °C in pure hydrogen. There is a catastrophic microstructural change in which SSC is completely decomposed to SrO and CoO that cover the surface of Sm 2 O 3 .

Original languageEnglish
Pages (from-to)269-274
Number of pages6
JournalJournal of Power Sources
Volume191
Issue number2
DOIs
Publication statusPublished - 2009 Jun 15

Fingerprint

Phase stability
solid oxide fuel cells
Solid oxide fuel cells (SOFC)
Cathodes
chambers
cathodes
Perovskite
Hydrogen
x rays
X ray photoelectron spectroscopy
photoelectron spectroscopy
Spectroscopy
impedance
Decomposition
decomposition
X ray diffraction
Scanning electron microscopy
scanning electron microscopy
hydrogen
diffraction

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 = "The stability of Sm 0.5 Sr 0.5 CoO 3 (SSC) under reduction conditions is investigated to determine whether it can be used as a cathode material in on-planar type, single-chamber, solid oxide fuel cells. The techniques of X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy are used to reveal the reduction mechanism of SSC. Impedance spectroscopy analysis also provides a better understanding of the influence of decomposed SSC phases on cathode performance. Decomposition of SSC occurs on the surface by the formation of dot-shaped SrO, Co(OH) 2 and CoO on top of the reduced SSC layer at 250 °C in 4{\%} H 2 O-96{\%} H 2 . The SSC perovskite structure is destroyed at 350 °C in pure hydrogen. There is a catastrophic microstructural change in which SSC is completely decomposed to SrO and CoO that cover the surface of Sm 2 O 3 .",
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Phase stability of Sm 0.5 Sr 0.5 CoO 3 cathodes for on-planar type, single-chamber, solid oxide fuel cells . / Song, Hwa Seob; Min, Ji Hyun; Kim, Joosun; Moon, Joo Ho.

In: Journal of Power Sources, Vol. 191, No. 2, 15.06.2009, p. 269-274.

Research output: Contribution to journalArticle

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AU - Song, Hwa Seob

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AB - The stability of Sm 0.5 Sr 0.5 CoO 3 (SSC) under reduction conditions is investigated to determine whether it can be used as a cathode material in on-planar type, single-chamber, solid oxide fuel cells. The techniques of X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy are used to reveal the reduction mechanism of SSC. Impedance spectroscopy analysis also provides a better understanding of the influence of decomposed SSC phases on cathode performance. Decomposition of SSC occurs on the surface by the formation of dot-shaped SrO, Co(OH) 2 and CoO on top of the reduced SSC layer at 250 °C in 4% H 2 O-96% H 2 . The SSC perovskite structure is destroyed at 350 °C in pure hydrogen. There is a catastrophic microstructural change in which SSC is completely decomposed to SrO and CoO that cover the surface of Sm 2 O 3 .

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