Cation-ordered perovskite-type anode and cathode materials for solid oxide fuel cells

Kun Zheng, Konrad Świerczek, Joanna Bratek, Alicja Klimkowicz

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

In this work selected cation-ordered perovskite-type anode and cathode materials were investigated in terms of their possible application in intermediate temperature solid oxide fuel cells (IT-SOFC). Their phase composition, oxygen content, chemical diffusion coefficient of oxygen D and surface exchange coefficient K, chemical stability in relation to ceria electrolyte, and stability of the anode material in reducing atmosphere were studied. It was found that Sr0.5Ba1.5CoMoO 6 - δ anode material exhibits Fm-3m symmetry with B-site rock salt-type cation ordering, while YBaCo2O5 + δ cathode material possesses P4/mmm space group with A-site layered-type cation ordering. In the case of SmBa0.5Sr0.5Co 1.5Fe0.5O5 + δ compound, partial (> 70 wt.%) A-site layer-type ordering was observed. Electrical conductivity σ of Sr0.5Ba1.5CoMoO6 - δ anode material is much lower (< 0.1 S·cm- 1), as compared to the studied cathode materials, for which σ > 100 S·cm- 1 in 600-800 °C temperature range was measured. However, in reducing conditions, conductivity of Sr0.5Ba1.5CoMoO6 - δ is significantly enhanced (~ 0.5 S·cm- 1). Chemical stability studies at 1000°C revealed that YBaCo2O5 + δ reacts with Ce0.8Gd0.2O1.9, while SmBa 0.5Sr0.5Co1.5Fe0.5O 5 + δ remains stable. In the case of Sr0.5Ba 1.5CoMoO6 - δ compound, long time annealing in reducing atmosphere of 5 vol.% H2 in Ar at 800°C caused decomposition of the material. Despite poor stability of the anode material in reducing conditions, relatively good performance of constructed H2 | Sr0.5Ba1.5CoMoO6 - δ | Ce 0.8Gd0.2O1.9 | SmBa0.5Sr 0.5Co1.5Fe0.5O5 + δ IT-SOFCs was recorded.

Original languageEnglish
Pages (from-to)354-358
Number of pages5
JournalSolid State Ionics
Volume262
DOIs
Publication statusPublished - 2014 Sep 1
Externally publishedYes

Fingerprint

solid oxide fuel cells
Solid oxide fuel cells (SOFC)
Perovskite
Cations
Anodes
Cathodes
anodes
cathodes
Positive ions
cations
Chemical stability
atmospheres
halites
oxygen
Oxygen
Cerium compounds
diffusion coefficient
perovskite
electrolytes
Phase composition

Keywords

  • Cation ordering
  • Double perovskite
  • Mixed ionic-electronic conductivity
  • Oxygen diffusion
  • Oxygen nonstoichiometry
  • SOFC

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Cation-ordered perovskite-type anode and cathode materials for solid oxide fuel cells. / Zheng, Kun; Świerczek, Konrad; Bratek, Joanna; Klimkowicz, Alicja.

In: Solid State Ionics, Vol. 262, 01.09.2014, p. 354-358.

Research output: Contribution to journalArticle

Zheng, Kun ; Świerczek, Konrad ; Bratek, Joanna ; Klimkowicz, Alicja. / Cation-ordered perovskite-type anode and cathode materials for solid oxide fuel cells. In: Solid State Ionics. 2014 ; Vol. 262. pp. 354-358.
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KW - Oxygen diffusion

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