Time-dependent performance changes in LSCF-infiltrated SOFC cathodes: The role of nano-particle coarsening

Megna Shah; Peter W. Voorhees; Scott A. Barnett

doi:10.1016/j.ssi.2011.02.003

Time-dependent performance changes in LSCF-infiltrated SOFC cathodes: The role of nano-particle coarsening

Megna Shah, Peter W. Voorhees, Scott A. Barnett

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

119 Scopus citations

Abstract

Symmetric solid oxide cells with Gd doped ceria (GDC) electrolytes and La_0.6Sr_0.4Co_0.2Fe_0.8O _{3 -δ} (LSCF)-infiltrated-GDC cathodes were maintained in air with no current at temperatures from 650 to 850 °C. Comparison of SEM images before and after aging showed inhomogeneous coarsening of LSCF nano-particles in the cathodes. The polarization resistance, measured periodically at 600 °C using electrochemical impedance spectroscopy, increased at a higher rate with increasing aging temperature. The resistance variation was fit using a model that relates resistance to time-dependent LSCF surface area, based on surface diffusion limited coarsening. Good agreement with the experimental data is obtained for a limited range of fitting parameters. The model predicts that the cathode resistance should increase from ~ 0.2 to 0.28-0.35 Ω cm ², if maintained at the operating temperature of 600 °C for 40,000 h.

Original language	English (US)
Pages (from-to)	64-67
Number of pages	4
Journal	Solid State Ionics
Volume	187
Issue number	1
DOIs	https://doi.org/10.1016/j.ssi.2011.02.003
State	Published - Apr 8 2011

Keywords

Cathode
Coarsening
Degradation
Infiltration
SOFC
Stability

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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title = "Time-dependent performance changes in LSCF-infiltrated SOFC cathodes: The role of nano-particle coarsening",

abstract = "Symmetric solid oxide cells with Gd doped ceria (GDC) electrolytes and La0.6Sr0.4Co0.2Fe0.8O 3 -δ (LSCF)-infiltrated-GDC cathodes were maintained in air with no current at temperatures from 650 to 850 °C. Comparison of SEM images before and after aging showed inhomogeneous coarsening of LSCF nano-particles in the cathodes. The polarization resistance, measured periodically at 600 °C using electrochemical impedance spectroscopy, increased at a higher rate with increasing aging temperature. The resistance variation was fit using a model that relates resistance to time-dependent LSCF surface area, based on surface diffusion limited coarsening. Good agreement with the experimental data is obtained for a limited range of fitting parameters. The model predicts that the cathode resistance should increase from ~ 0.2 to 0.28-0.35 Ω cm 2, if maintained at the operating temperature of 600 °C for 40,000 h.",

keywords = "Cathode, Coarsening, Degradation, Infiltration, SOFC, Stability",

author = "Megna Shah and Voorhees, {Peter W.} and Barnett, {Scott A.}",

note = "Funding Information: The authors gratefully acknowledge the financial support of the Department of Energy , (Award No. DE-FG02-05ER46255 ).",

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doi = "10.1016/j.ssi.2011.02.003",

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AU - Shah, Megna

AU - Voorhees, Peter W.

AU - Barnett, Scott A.

N1 - Funding Information: The authors gratefully acknowledge the financial support of the Department of Energy , (Award No. DE-FG02-05ER46255 ).

PY - 2011/4/8

Y1 - 2011/4/8

N2 - Symmetric solid oxide cells with Gd doped ceria (GDC) electrolytes and La0.6Sr0.4Co0.2Fe0.8O 3 -δ (LSCF)-infiltrated-GDC cathodes were maintained in air with no current at temperatures from 650 to 850 °C. Comparison of SEM images before and after aging showed inhomogeneous coarsening of LSCF nano-particles in the cathodes. The polarization resistance, measured periodically at 600 °C using electrochemical impedance spectroscopy, increased at a higher rate with increasing aging temperature. The resistance variation was fit using a model that relates resistance to time-dependent LSCF surface area, based on surface diffusion limited coarsening. Good agreement with the experimental data is obtained for a limited range of fitting parameters. The model predicts that the cathode resistance should increase from ~ 0.2 to 0.28-0.35 Ω cm 2, if maintained at the operating temperature of 600 °C for 40,000 h.

AB - Symmetric solid oxide cells with Gd doped ceria (GDC) electrolytes and La0.6Sr0.4Co0.2Fe0.8O 3 -δ (LSCF)-infiltrated-GDC cathodes were maintained in air with no current at temperatures from 650 to 850 °C. Comparison of SEM images before and after aging showed inhomogeneous coarsening of LSCF nano-particles in the cathodes. The polarization resistance, measured periodically at 600 °C using electrochemical impedance spectroscopy, increased at a higher rate with increasing aging temperature. The resistance variation was fit using a model that relates resistance to time-dependent LSCF surface area, based on surface diffusion limited coarsening. Good agreement with the experimental data is obtained for a limited range of fitting parameters. The model predicts that the cathode resistance should increase from ~ 0.2 to 0.28-0.35 Ω cm 2, if maintained at the operating temperature of 600 °C for 40,000 h.

KW - Cathode

KW - Coarsening

KW - Degradation

KW - Infiltration

KW - SOFC

KW - Stability

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Time-dependent performance changes in LSCF-infiltrated SOFC cathodes: The role of nano-particle coarsening

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Keywords

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