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

Cite this

@article{6807fd9afa544014b7acbd5a139059f5,
title = "Stability of La0.6Sr0.4Co0.2Fe0.8O3/Ce0.9Gd0.1O2 cathodes during sintering and solid oxide fuel cell operation",
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.",
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",
author = "Ragnar Kiebach and Weiwei Zhang and Wei Zhang and Ming Chen and Kion Norrman and Hsiang-Jen Wang and Bowen, {Jacob R.} and Rasmus Barfod and Hendriksen, {Peter Vang}",
year = "2015",
doi = "10.1016/j.jpowsour.2015.02.064",
language = "English",
volume = "283",
pages = "151--161",
journal = "Journal of Power Sources",
issn = "0378-7753",
publisher = "Elsevier",

}

Stability of La0.6Sr0.4Co0.2Fe0.8O3/Ce0.9Gd0.1O2 cathodes during sintering and solid oxide fuel cell operation. / Kiebach, Ragnar; Zhang, Weiwei; Zhang, Wei; Chen, Ming; Norrman, Kion; Wang, Hsiang-Jen; Bowen, Jacob R.; Barfod, Rasmus; Hendriksen, Peter Vang.

In: Journal of Power Sources, Vol. 283, 2015, p. 151-161.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Stability of La0.6Sr0.4Co0.2Fe0.8O3/Ce0.9Gd0.1O2 cathodes during sintering and solid oxide fuel cell operation

AU - Kiebach, Ragnar

AU - Zhang, Weiwei

AU - Zhang, Wei

AU - Chen, Ming

AU - Norrman, Kion

AU - Wang, Hsiang-Jen

AU - Bowen, Jacob R.

AU - Barfod, Rasmus

AU - Hendriksen, Peter Vang

PY - 2015

Y1 - 2015

N2 - 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.

AB - 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.

KW - Cathode degradation

KW - LSCF

KW - SEM

KW - SOFC

KW - TEM

KW - TOF-SIMS

KW - Cathodes

KW - Diffusion barriers

KW - Electrodes

KW - Electrolytes

KW - Fuel cells

KW - Mass spectrometry

KW - Organic polymers

KW - Phase separation

KW - Scanning electron microscopy

KW - Secondary ion mass spectrometry

KW - Sintering

KW - Solid oxide fuel cells (SOFC)

KW - Transmission electron microscopy

KW - Cathode degradations

KW - Electrolyte interfaces

KW - Impurity distribution

KW - Phase segregations

KW - Post mortem analysis

KW - Time of flight secondary ion mass spectrometry

KW - ToF SIMS

KW - Solid electrolytes

U2 - 10.1016/j.jpowsour.2015.02.064

DO - 10.1016/j.jpowsour.2015.02.064

M3 - Journal article

VL - 283

SP - 151

EP - 161

JO - Journal of Power Sources

JF - Journal of Power Sources

SN - 0378-7753

ER -