Improvement in stability of La0.4Ba0.6CoO3 cathode by combination with La0.6Sr0.4Co 0.2Fe0.8O3 for intermediate temperature-solid oxide fuel cells

Jing Xie, Young Wan Ju, Takaaki Sakai, Tatsumi Ishihara

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Improvement in long-term stability and cathodic activity of La 0.4Ba0.6CoO3 (BLC) was studied by mixing with La0.6Sr0.4Co0.2Fe0.8O3 (LSCF). LSCF exhibits good long-term stability; however, surface activity is not high like Co-based perovskite. On the other hand, the cathodic activity of BLC is high; however, long-term stability was not so good and large degradation at initial period is observed. Combination of the two oxides shows small overpotential as well as improved long-term stability. Effects of BLC/LSCF ratio on stability and overpotential were studied and it was found that BLC-LSCF (7:3) showed the most stable and small cathodic overpotential among the examined compositions. Although the power density was still slightly decreased over 24 h at 0.5 V terminal voltage, the maximum powder density of the cell using BLC-LSCF composite oxides for cathode shows 2.5 times larger than that of the cell using LSCF cathode and 1.06 times larger than that of BLC. Degradation rate is smaller than 4 % from 5 to 24 h on this BLC-LSCF cathode at current density as high as 682 mA/cm2 after 24 h operation.

Original languageEnglish
Pages (from-to)2251-2258
Number of pages8
JournalJournal of Solid State Electrochemistry
Volume17
Issue number8
DOIs
Publication statusPublished - Aug 1 2013

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solid oxide fuel cells
Solid oxide fuel cells (SOFC)
Cathodes
cathodes
Oxides
Temperature
temperature
degradation
Degradation
oxides
cells
Powders
Perovskite
radiant flux density
Current density
current density
composite materials
Composite materials
Electric potential
electric potential

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry
  • Electrical and Electronic Engineering

Cite this

Improvement in stability of La0.4Ba0.6CoO3 cathode by combination with La0.6Sr0.4Co 0.2Fe0.8O3 for intermediate temperature-solid oxide fuel cells. / Xie, Jing; Ju, Young Wan; Sakai, Takaaki; Ishihara, Tatsumi.

In: Journal of Solid State Electrochemistry, Vol. 17, No. 8, 01.08.2013, p. 2251-2258.

Research output: Contribution to journalArticle

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abstract = "Improvement in long-term stability and cathodic activity of La 0.4Ba0.6CoO3 (BLC) was studied by mixing with La0.6Sr0.4Co0.2Fe0.8O3 (LSCF). LSCF exhibits good long-term stability; however, surface activity is not high like Co-based perovskite. On the other hand, the cathodic activity of BLC is high; however, long-term stability was not so good and large degradation at initial period is observed. Combination of the two oxides shows small overpotential as well as improved long-term stability. Effects of BLC/LSCF ratio on stability and overpotential were studied and it was found that BLC-LSCF (7:3) showed the most stable and small cathodic overpotential among the examined compositions. Although the power density was still slightly decreased over 24 h at 0.5 V terminal voltage, the maximum powder density of the cell using BLC-LSCF composite oxides for cathode shows 2.5 times larger than that of the cell using LSCF cathode and 1.06 times larger than that of BLC. Degradation rate is smaller than 4 {\%} from 5 to 24 h on this BLC-LSCF cathode at current density as high as 682 mA/cm2 after 24 h operation.",
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