Stability of La0.6Sr0.4Co0.2Fe0.8O3/Ce0.9Gd0.1O2 cathodes during sintering and solid oxide fuel cell operation

Ragnar Kiebach, Weiwei Zhang, Wei Zhang, Ming Chen, Kion Norrman, Hsiang-Jen Wang, Jacob R. Bowen, Rasmus Barfod, Peter Vang Hendriksen

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Abstract

Degradation phenomena of La0.58Sr0.4Co0.2Fe0.8O3/Ce0.9Gd0.1O2 (LSCF/CGO) cathodes were investigated via post-mortem analyses of an experimental solid oxide fuel cell (SOFC) stack tested at 700 °C for 2000 h using advanced electron microscopy (SEM-EDS, HR-TEM-EDS) and time-of-flight secondary ion mass spectrometry (TOF-SIMS). Similar studies were carried out on non-tested reference cells for comparison. The analysis focused on the LSCF/CGO cathode and the CGO barrier layer, as the cathode degradation can be a major contributor to the overall degradation in this type of SOFC. SEM-EDS and TOF-SIMS were used to investigate inter-diffusion across the barrier layer - electrolyte interface and the barrier layer - cathode interface. In addition, TOF-SIMS data were employed to investigate impurity distribution before and after testing. HR-TEM-EDS was used to investigate possible phase segregation in the LSCF and to look for reaction between the phases. The results show that phase separation and inter-diffusion across the cathode-barrier layer interface and the barrier layer-electrolyte interface happened mainly during sintering and cathode firing, and to a very little degree during the test period.
Original languageEnglish
JournalJournal of Power Sources
Volume283
Pages (from-to)151-161
ISSN0378-7753
DOIs
Publication statusPublished - 2015

Keywords

  • Cathode degradation
  • LSCF
  • SEM
  • SOFC
  • TEM
  • TOF-SIMS
  • Cathodes
  • Diffusion barriers
  • Electrodes
  • Electrolytes
  • Fuel cells
  • Mass spectrometry
  • Organic polymers
  • Phase separation
  • Scanning electron microscopy
  • Secondary ion mass spectrometry
  • Sintering
  • Solid oxide fuel cells (SOFC)
  • Transmission electron microscopy
  • Cathode degradations
  • Electrolyte interfaces
  • Impurity distribution
  • Phase segregations
  • Post mortem analysis
  • Time of flight secondary ion mass spectrometry
  • ToF SIMS
  • Solid electrolytes

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