Durability of a Segmented-in-Series Tubular SOFC with a (Ce, Sm)O 2 cathode interlayer: Influence of operating conditions

Yoshinori Kobayashi, Kazuo Tomida, Hiroshi Tsukuda, Yusuke Shiratori, Shunsuke Taniguchi, Kazunari Sasakid

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The influence of operating temperature and fuel/air utilization on long-term chemical stability and cell performance degradation is comprehensively investigated and reported for a segmented-in-series tubular solid oxide fuel cell (SOFC), with a (La0.5Sr0.25Ca0.25)MnO 3 (LSCM) cathode and a (Ce0.8Sm0.2)O 2 (SDC) cathode interlayer, under development for large-scale power plants combined with SOFCs. During three kinds of durability tests for 5000 hours, the average degradation rates of the cell-stacks were around zero, well meeting a tolerant cell voltage degradation rate target of 0.25% per 1000 hours, corresponding to the 10% cell voltage degradation for 40,000 hours. The electrochemical performance was stable at high operating temperature, although the porosity of the SDC cathode-interlayer decreased due to Mn and Ca diffusion from the LSCM cathode. On the other hand, the cell voltage noticeably decreased at lower operating temperature, below 800°C. Detailed observation of the microstructure and elemental distribution after durability testing revealed that a dense layer formed between the LSCM cathode and the SDC interlayer at low temperature, consisting of La, Ca, and Mn. The degradation in cell performance is attributed to the formation of this dense layer, preventing oxygen supply to the electrode reaction sites.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume161
Issue number3
DOIs
Publication statusPublished - Feb 14 2014

Fingerprint

solid oxide fuel cells
Solid oxide fuel cells (SOFC)
durability
interlayers
Durability
Cathodes
cathodes
Degradation
degradation
cells
operating temperature
Electric potential
electric potential
Oxygen supply
Temperature
Chemical stability
power plants
Power plants
Porosity
Microstructure

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

Durability of a Segmented-in-Series Tubular SOFC with a (Ce, Sm)O 2 cathode interlayer : Influence of operating conditions. / Kobayashi, Yoshinori; Tomida, Kazuo; Tsukuda, Hiroshi; Shiratori, Yusuke; Taniguchi, Shunsuke; Sasakid, Kazunari.

In: Journal of the Electrochemical Society, Vol. 161, No. 3, 14.02.2014.

Research output: Contribution to journalArticle

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