Boron poisoning of (La, Sr)(Co, Fe)O3 cathodes of solid oxide fuel cells

Kongfa Chen, Junji Hyodo, Ling Zhao, Na Ai, Tatsumi Ishihara, San Ping Jiang

Research output: Contribution to journalArticle

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Abstract

Effect of volatile boron species on the properties of La 0.6Sr0.4Co0.2Fe0.8O3 (LSCF) cathode materials has been studied in detail by using porous electrode coatings and dense bar samples. Prior to the characterization, the LSCF samples were heat-treated at 800°C in air in the presence of borosilicate glass for 7 and 30 days. Heat-treatment in the presence of glass has a significant detrimental effect on the surface exchange rate, electrical properties, and electrochemical activity of the cathodes. Secondary ion mass spectroscopy (SIMS) detected the deposition of boron as well as sodium and potassium on the surface and in the bulk of the bar samples. The boron deposition results in significant microstructure and composition changes. Sr in the form of SrB2O 4 is enriched on the outmost surface of LSCF bar samples, leading to the Srdeficient in the adjacent layer in the bulk. The present study demonstrates the remarkable detrimental effect of volatile boron species on the microstructure and electrochemical activity degradation of the LSCF cathode materials of solid oxide fuel cells.

Original languageEnglish
Pages (from-to)1821-1830
Number of pages10
JournalECS Transactions
Volume57
Issue number1
DOIs
Publication statusPublished - Jan 1 2013

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Solid oxide fuel cells (SOFC)
Boron
Cathodes
Microstructure
Borosilicate glass
Potassium
Electric properties
Heat treatment
Sodium
Spectroscopy
Degradation
Glass
Coatings
Electrodes
Ions
Air
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Boron poisoning of (La, Sr)(Co, Fe)O3 cathodes of solid oxide fuel cells. / Chen, Kongfa; Hyodo, Junji; Zhao, Ling; Ai, Na; Ishihara, Tatsumi; Jiang, San Ping.

In: ECS Transactions, Vol. 57, No. 1, 01.01.2013, p. 1821-1830.

Research output: Contribution to journalArticle

Chen, Kongfa ; Hyodo, Junji ; Zhao, Ling ; Ai, Na ; Ishihara, Tatsumi ; Jiang, San Ping. / Boron poisoning of (La, Sr)(Co, Fe)O3 cathodes of solid oxide fuel cells. In: ECS Transactions. 2013 ; Vol. 57, No. 1. pp. 1821-1830.
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