Electrochemical characteristics of cathodes in solid oxide fuel cells based on ceria electrolytes

M. Gödickemeier; K. Sasaki; L. J. Gauckler; I. Riess

doi:10.1149/1.1837653

Electrochemical characteristics of cathodes in solid oxide fuel cells based on ceria electrolytes

M. Gödickemeier, K. Sasaki, L. J. Gauckler, I. Riess

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114 Citations (Scopus)

Abstract

The ionic current-overpotential characteristics of cathodes on ceria-based electrolytes have been evaluated by galvanostatic current-interrupt measurements. The measurements were carried out on mixed conducting ceria electrolytes under fuel cell operating conditions. The effect on the oxygen reduction kinetics of the simultaneous transport of electrons and oxygen was investigated. As model substances for cathodes were La_0.8Sr_0.2MnO₃, La_0.84Sr0_.16CoO₃, Pt, Ag, and Au. Cathode reaction mechanisms as a function of the transport properties are discussed for the different cathode materials. Steady-state cathode overpotentials were interpreted using a Butler-Volmer-type equation to describe charge-transfer processes and to evaluate exchange current densities. At 700°C the exchange current density of the best cathode La_0.84Sr_0.16CoO₃ was 180 mA/cm² whereas the one for La_0.8Sr_0.2MnO₃ was only 30 mA/cm². In both cases we identified charge-transfer on the cathode material as the rate-limiting step.

Original language	English
Pages (from-to)	1635-1646
Number of pages	12
Journal	Journal of the Electrochemical Society
Volume	144
Issue number	5
DOIs	https://doi.org/10.1149/1.1837653
Publication status	Published - May 1997
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Surfaces, Coatings and Films
Electrochemistry
Materials Chemistry

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title = "Electrochemical characteristics of cathodes in solid oxide fuel cells based on ceria electrolytes",

abstract = "The ionic current-overpotential characteristics of cathodes on ceria-based electrolytes have been evaluated by galvanostatic current-interrupt measurements. The measurements were carried out on mixed conducting ceria electrolytes under fuel cell operating conditions. The effect on the oxygen reduction kinetics of the simultaneous transport of electrons and oxygen was investigated. As model substances for cathodes were La0.8Sr0.2MnO3, La0.84Sr0.16CoO3, Pt, Ag, and Au. Cathode reaction mechanisms as a function of the transport properties are discussed for the different cathode materials. Steady-state cathode overpotentials were interpreted using a Butler-Volmer-type equation to describe charge-transfer processes and to evaluate exchange current densities. At 700°C the exchange current density of the best cathode La0.84Sr0.16CoO3 was 180 mA/cm2 whereas the one for La0.8Sr0.2MnO3 was only 30 mA/cm2. In both cases we identified charge-transfer on the cathode material as the rate-limiting step.",

author = "M. G{\"o}dickemeier and K. Sasaki and Gauckler, {L. J.} and I. Riess",

year = "1997",

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AU - Gödickemeier, M.

AU - Sasaki, K.

AU - Gauckler, L. J.

AU - Riess, I.

PY - 1997/5

Y1 - 1997/5

N2 - The ionic current-overpotential characteristics of cathodes on ceria-based electrolytes have been evaluated by galvanostatic current-interrupt measurements. The measurements were carried out on mixed conducting ceria electrolytes under fuel cell operating conditions. The effect on the oxygen reduction kinetics of the simultaneous transport of electrons and oxygen was investigated. As model substances for cathodes were La0.8Sr0.2MnO3, La0.84Sr0.16CoO3, Pt, Ag, and Au. Cathode reaction mechanisms as a function of the transport properties are discussed for the different cathode materials. Steady-state cathode overpotentials were interpreted using a Butler-Volmer-type equation to describe charge-transfer processes and to evaluate exchange current densities. At 700°C the exchange current density of the best cathode La0.84Sr0.16CoO3 was 180 mA/cm2 whereas the one for La0.8Sr0.2MnO3 was only 30 mA/cm2. In both cases we identified charge-transfer on the cathode material as the rate-limiting step.

AB - The ionic current-overpotential characteristics of cathodes on ceria-based electrolytes have been evaluated by galvanostatic current-interrupt measurements. The measurements were carried out on mixed conducting ceria electrolytes under fuel cell operating conditions. The effect on the oxygen reduction kinetics of the simultaneous transport of electrons and oxygen was investigated. As model substances for cathodes were La0.8Sr0.2MnO3, La0.84Sr0.16CoO3, Pt, Ag, and Au. Cathode reaction mechanisms as a function of the transport properties are discussed for the different cathode materials. Steady-state cathode overpotentials were interpreted using a Butler-Volmer-type equation to describe charge-transfer processes and to evaluate exchange current densities. At 700°C the exchange current density of the best cathode La0.84Sr0.16CoO3 was 180 mA/cm2 whereas the one for La0.8Sr0.2MnO3 was only 30 mA/cm2. In both cases we identified charge-transfer on the cathode material as the rate-limiting step.

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Electrochemical characteristics of cathodes in solid oxide fuel cells based on ceria electrolytes

Abstract

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UN SDGs

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