Evidence of surface-reaction rate limitations in SOFC composite cathodes

Rainer Küngas; Fred Bidrawn; Eyas Mahmoud; John M. Vohs; Raymond J. Gorte

doi:10.1016/j.ssi.2012.04.030

Evidence of surface-reaction rate limitations in SOFC composite cathodes

Rainer Küngas, Fred Bidrawn, Eyas Mahmoud, John M. Vohs, Raymond J. Gorte

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

41 Citations (Scopus)

Abstract

An analytical model has been developed and experimentally tested to determine the factors that lead to high overpotentials in composite solid oxide fuel cell (SOFC) cathodes. Results suggest that the performance of infiltrated, composite electrodes is limited by O ₂ adsorption and incorporation into the perovskite lattice. The impedance of cathodes prepared by infiltration of La _0.8Sr _0.2FeO ₃ (LSF) into porous yttria-stabilized zirconia (YSZ) depends strongly on the surface area of the perovskite phase and is independent of LSF film thickness. Model predictions about the effect of the microstructure and ionic conductivity of the porous electrolyte scaffold were also verified.

Original language	English
Pages (from-to)	146-150
Number of pages	5
Journal	Solid State Ionics
Volume	225
DOIs	https://doi.org/10.1016/j.ssi.2012.04.030
Publication status	Published - Oct 4 2012
Externally published	Yes

Keywords

Cathode
Infiltration
LSF
Modeling
Solid oxide fuel cells
YSZ

ASJC Scopus subject areas

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

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10.1016/j.ssi.2012.04.030

Cite this

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title = "Evidence of surface-reaction rate limitations in SOFC composite cathodes",

abstract = "An analytical model has been developed and experimentally tested to determine the factors that lead to high overpotentials in composite solid oxide fuel cell (SOFC) cathodes. Results suggest that the performance of infiltrated, composite electrodes is limited by O 2 adsorption and incorporation into the perovskite lattice. The impedance of cathodes prepared by infiltration of La 0.8Sr 0.2FeO 3 (LSF) into porous yttria-stabilized zirconia (YSZ) depends strongly on the surface area of the perovskite phase and is independent of LSF film thickness. Model predictions about the effect of the microstructure and ionic conductivity of the porous electrolyte scaffold were also verified.",

keywords = "Cathode, Infiltration, LSF, Modeling, Solid oxide fuel cells, YSZ",

author = "Rainer K{\"u}ngas and Fred Bidrawn and Eyas Mahmoud and Vohs, {John M.} and Gorte, {Raymond J.}",

note = "Funding Information: This work was funded by the U.S. Department of Energy's Hydrogen Fuel Initiative (grant DE-FG02-05ER15721 ).",

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doi = "10.1016/j.ssi.2012.04.030",

language = "English",

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journal = "Solid State Ionics",

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TY - JOUR

T1 - Evidence of surface-reaction rate limitations in SOFC composite cathodes

AU - Küngas, Rainer

AU - Bidrawn, Fred

AU - Mahmoud, Eyas

AU - Vohs, John M.

AU - Gorte, Raymond J.

N1 - Funding Information: This work was funded by the U.S. Department of Energy's Hydrogen Fuel Initiative (grant DE-FG02-05ER15721 ).

PY - 2012/10/4

Y1 - 2012/10/4

N2 - An analytical model has been developed and experimentally tested to determine the factors that lead to high overpotentials in composite solid oxide fuel cell (SOFC) cathodes. Results suggest that the performance of infiltrated, composite electrodes is limited by O 2 adsorption and incorporation into the perovskite lattice. The impedance of cathodes prepared by infiltration of La 0.8Sr 0.2FeO 3 (LSF) into porous yttria-stabilized zirconia (YSZ) depends strongly on the surface area of the perovskite phase and is independent of LSF film thickness. Model predictions about the effect of the microstructure and ionic conductivity of the porous electrolyte scaffold were also verified.

AB - An analytical model has been developed and experimentally tested to determine the factors that lead to high overpotentials in composite solid oxide fuel cell (SOFC) cathodes. Results suggest that the performance of infiltrated, composite electrodes is limited by O 2 adsorption and incorporation into the perovskite lattice. The impedance of cathodes prepared by infiltration of La 0.8Sr 0.2FeO 3 (LSF) into porous yttria-stabilized zirconia (YSZ) depends strongly on the surface area of the perovskite phase and is independent of LSF film thickness. Model predictions about the effect of the microstructure and ionic conductivity of the porous electrolyte scaffold were also verified.

KW - Cathode

KW - Infiltration

KW - LSF

KW - Modeling

KW - Solid oxide fuel cells

KW - YSZ

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DO - 10.1016/j.ssi.2012.04.030

M3 - Article

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VL - 225

SP - 146

EP - 150

JO - Solid State Ionics

JF - Solid State Ionics

ER -

Evidence of surface-reaction rate limitations in SOFC composite cathodes

Abstract

Keywords

ASJC Scopus subject areas

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