La-doped BaCoO3 as a cathode for intermediate temperature solid oxide fuel cells using a LaGaO3 base electrolyte

Tatsumi Ishihara, Satoko Fukui, Hiroyasu Nishiguchi, Yusaku Takita

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Abstract

Cathodic behavior of BaCoO3 doped with La was investigated in this study for an intermediate temperature solid oxide fuel cell (ITFC). Electrical conductivity of BaCoO3 increased monotonically with an increasing amount of La doped for the Ba site at 1073 K po(2) = 10-5 atm. Cathodic overpotential at 1073 K decreased with increasing La content and attained a minimum at X = 0.3-0.5 in Ba1-xLaxCoO3. Since the cathodic overpotential of Ba0.6La0.4CoO3 kept a small value at decreased temperature, Ba0.6La0.4CoO3 is the optimum composition for the cathode of an ITFC among BaCoO3-based oxides. When La0.8Sr0.2Ga0.8Mg0.15Co0.05 O3 was used for the electrolyte, the power density of the cell using Ba0.6La0.4CoO3 for the cathode at 1073 K attained a value of 550 mW/cm2, which is slightly higher than that using Sm0.5Sr0.5CoO3 for the cathode. In addition, a low cathodic overpotential of Ba0.6La0.4CoO3 was also maintained in air. 18O-16O exchange reaction was performed to estimate the surface activity for oxygen dissociation. It was found that BaCoO3 exhibits high activity for the oxygen exchange reaction. Therefore, superior cathode property was assigned to the high surface activity of BaCoO3.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume149
Issue number7
DOIs
Publication statusPublished - Jul 1 2002
Externally publishedYes

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solid oxide fuel cells
Solid oxide fuel cells (SOFC)
Electrolytes
Cathodes
cathodes
electrolytes
Oxygen
Temperature
temperature
oxygen
Oxides
radiant flux density
dissociation
electrical resistivity
oxides
air
estimates
Air
cells
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

La-doped BaCoO3 as a cathode for intermediate temperature solid oxide fuel cells using a LaGaO3 base electrolyte. / Ishihara, Tatsumi; Fukui, Satoko; Nishiguchi, Hiroyasu; Takita, Yusaku.

In: Journal of the Electrochemical Society, Vol. 149, No. 7, 01.07.2002.

Research output: Contribution to journalArticle

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