LI, Qiang; SUN, Liping; ZHAO, Hui; HUO, Lihua; GRENIER, Jean-Claude; BASSAT, Jean-Marc.; MAUVY, Fabrice

doi:10.1016/j.jpowsour.2013.03.010

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LI, Qiang
Key Laboratory of Functional Inorganic Material Chemistry [KLFIMC]

SUN, Liping
Key Laboratory of Functional Inorganic Material Chemistry [KLFIMC]

ZHAO, Hui
Key Laboratory of Functional Inorganic Material Chemistry [KLFIMC]

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Journal of Power Sources. 2013, vol. 238, p. 11-16

Elsevier

Résumé en anglais

Brownmillerite oxide Ca2Fe1.3Mn0.7O5+δ is synthesized and evaluated as a new cathode material for solid oxide fuel cells (SOFCs). The average thermal expansion coefficient (TEC) of Ca2Fe1.3Mn0.7O5+δ is 13.3 ± 0.2 × 10−6 K−1, close to that of the typical electrolyte materials. The lowest polarization resistance (Rp) (0.22 ± 0.02 Ω cm2 at 750 °C in air) and cathodic overpotential values are achieved when the material is sintered at 1000 °C on Ce0.9Gd0.1O1.95 (CGO) electrolyte. Two main oxygen reduction reaction (ORR) processes are identified. The rate limiting step for ORR is found to depend on the oxygen partial pressure. The excellent electrochemical performance indicates that Ca2Fe1.3Mn0.7O5+δ can be a promising cathode material for SOFCs.< Réduire

Mots clés en espagnol

Solid oxide fuel cells

Brownmillerite oxide

Cathode material

Electrode reaction

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Evaluation of brownmillerite oxide as cathode for solid oxide fuel cells

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