The electrical properties of doped SrCeO3 and BaCeO3 were studied as a function of temperature, and oxygen and water vapor partial pressure using electrochemical impedance spectroscopy. Rare-earth elements, such as Yb, Eu, and Sm, were used as cation dopants because of their multivalent oxidation state, low third ionization potential, and comparable ionic radius with cerium. Higher conductivity values were recorded doping SrCeO3 and BaCeO3 oxides with Yb. Partial conductivities and transport numbers were calculated from the conductivity measurements at different oxygen partial pressures using an established defect model. In an oxidizing condition, electron-hole conduction was dominant at high temperatures and decreased with decreasing the temperature and increasing the water vapor content in the gas atmosphere. BaCe0.9Yb0.1O3-delta presented the highest conductivity among the tested samples both in dry and wet oxygen atmospheres. Moreover, BaCe0.9Yb0.1O3-delta showed a mixed conduction of ions and holes at temperatures above 600 degrees C, suggesting that this perovskite-type oxide could be a possible cathode material in a solid oxide fuel cell (SOFC) based on a proton conductor electrolyte.

Fabbri, E., Oh, T.K., Licoccia, S., Traversa, E., & Wachsman, E.D. (2009). Mixed protonic/electronic conductor cathodes for intermediate temperature SOFCs based on proton conducting electrolytes. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 156(1), B38-B45 [10.1149/1.3005781].

Mixed protonic/electronic conductor cathodes for intermediate temperature SOFCs based on proton conducting electrolytes

LICOCCIA, SILVIA;TRAVERSA, ENRICO;
2009

Abstract

The electrical properties of doped SrCeO3 and BaCeO3 were studied as a function of temperature, and oxygen and water vapor partial pressure using electrochemical impedance spectroscopy. Rare-earth elements, such as Yb, Eu, and Sm, were used as cation dopants because of their multivalent oxidation state, low third ionization potential, and comparable ionic radius with cerium. Higher conductivity values were recorded doping SrCeO3 and BaCeO3 oxides with Yb. Partial conductivities and transport numbers were calculated from the conductivity measurements at different oxygen partial pressures using an established defect model. In an oxidizing condition, electron-hole conduction was dominant at high temperatures and decreased with decreasing the temperature and increasing the water vapor content in the gas atmosphere. BaCe0.9Yb0.1O3-delta presented the highest conductivity among the tested samples both in dry and wet oxygen atmospheres. Moreover, BaCe0.9Yb0.1O3-delta showed a mixed conduction of ions and holes at temperatures above 600 degrees C, suggesting that this perovskite-type oxide could be a possible cathode material in a solid oxide fuel cell (SOFC) based on a proton conductor electrolyte.
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore CHIM/07 - Fondamenti Chimici delle Tecnologie
Settore ING-IND/22 - Scienza e Tecnologia dei Materiali
English
Con Impact Factor ISI
Barium; Cathodes; Cerium; Doping (additives); Earth atmosphere; Electric batteries; Electric properties; Electrochemical corrosion; Electrochemical impedance spectroscopy; Electrolytes; Electron tubes; Europium; Fuel cells; Heat conduction; Ionization of gases; Ionization of liquids; Ionization potential; Metallic glass; Oxide minerals; Oxygen; Ozone water treatment; Perovskite; Protons; Rare earth elements; Solid oxide fuel cells (SOFC); Vapors; Water content; Water vapor; Ytterbium; Cathode materials; Cation dopants; Conductivity measurements; Defect models; Dry and wets; Electrical properties; Electrochemical impedances; Gas atmospheres; High temperatures; Hole conductions; Intermediate temperatures; Ionic radiuses; Mixed conductions; Oxidation states; Oxidizing conditions; Oxygen partial pressures; Partial conductivities; Proton conducting; Proton conductors; Transport numbers; Vapor partial pressures; Atmospheric temperature
Fabbri, E., Oh, T.K., Licoccia, S., Traversa, E., & Wachsman, E.D. (2009). Mixed protonic/electronic conductor cathodes for intermediate temperature SOFCs based on proton conducting electrolytes. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 156(1), B38-B45 [10.1149/1.3005781].
Fabbri, E; Oh, T; Licoccia, S; Traversa, E; Wachsman, E
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/25636
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