GRIMAUD, Alexis; MAUVY, Fabrice; FOURCADE, Sébastien; ROCHERON, Laure; MARRONY, Mathieu; GRENIER, Jean-Claude

doi:10.1149/2.101205jes

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GRIMAUD, Alexis
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

MAUVY, Fabrice
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

FOURCADE, Sébastien
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal of The Electrochemical Society. 2012, vol. 159, n° 6, p. B683-B694

Electrochemical Society

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Four mixed ionic-electronic conducting (MIEC) perovskite-related oxides were studied as potential H+-SOFC cathode materials: La0.6Sr0.4Fe0.8Co0.2O3−, Ba0.5Sr0.5Co0.8Fe0.2O3−, PrBaCo2O5+ and Pr2NiO4+. Their hydration properties were measured by TGA: Ba0.5Sr0.5Co0.8Fe0.2O3− shows the largest water uptake. Their electrochemical performances were characterized using BaCe0.9Y0.1O3− as electrolyte; polarization resistances as low as 0.5 cm2 were found at 600°C, for PrBaCo2O5+ and Pr2NiO4+. The rate determining steps of the oxygen reduction reaction were determined on the basis of electrochemical studies performed as a function of pH2O, in air. Proton transfer and water release appear to be the rate determining steps for Ba0.5Sr0.5Co0.8Fe0.2O3−, PrBaCo2O5+ and Pr2NiO4+. No rate determining step involving proton was found for La0.6Sr0.4Fe0.8Co0.2O3−. On the basis of this study, one can suggest that Ba0.5Sr0.5Co0.8Fe0.2O3−, PrBaCo2O5+ and Pr2NiO4+ show some protonic conduction as well as oxide diffusivity and can be labeled Triple Conducting (e-/O2−/H+) Oxides, so-called TCO.< Réduire

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Chemical reactions

SOFC

Perovskite

Cathodes

Oxides

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Hydration properties and rate determining steps of the oxygen reduction reaction of perovskite-related oxides as H+-SOFC cathodes

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