MARIK, Sourav; NICOLLET, Clément; CHANNABASAPPA, Madhu; FOURCADE, Sébastien; WATTIAUX, Alain; DUTTINE, Mathieu; DECOURT, Rodolphe; BASSAT, Jean-Marc.; TOULEMONDE, Olivier

doi:10.1002/fuce.201600203

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MARIK, Sourav
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

NICOLLET, Clément
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

CHANNABASAPPA, Madhu
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Fuel Cells. 2017, vol. 17, n° 3, p. 353-358

Wiley-VCH Verlag

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Structure, electrical conductivity and electrochemical performance for a new oxygen deficient perovskite material with composition SrCo0.85Fe0.15O2.62 is explored here. It crystallizes in a " 314-type " oxygen-vacancy ordered structure (Space Group: I4/mmm) with 2ap × 2ap × 4ap unit cell, and contains alternate oxygen replete [Co2/Fe2-O] and oxygen deficient [Co1/Fe1-O] planes along c-direction. Room temperature Mössbauer spectroscopy and room temperature neutron powder diffraction confirm the presence of mixed valence states (3+ and 4+) for both Fe and Co. Polaronic behavior in the electrical conductivity is observed below 400 °C, and attributed to the presence of Co 4+ and Fe 3+ cations in the structure. The electrical conductivity at 600 °C is high enough (∼200 S cm −1) to act as a cathode material. At the same time, the polarization resistance measurements show an excellent value of 0.1 Ω cm 2 at 600 °C. These results suggest that at 600 °C, this material is a mixed oxide-ion and electronic conductor exhibiting excellent activity for the oxygen reduction reaction, making it a promising cathode material for an intermediate temperature solid oxide fuel cell.< Réduire

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SrCo0.85Fe0.15O2.62 -Oxygen deficient "314-type" perovskite; a highly efficient cathode for solid oxide fuel cells

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