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Eu2SrCo1.5Fe0.5O7 a new promising Ruddlesden–Popper member as a cathode component for intermediate temperature solid oxide fuel cells

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Abstract

A new oxide of the Ruddlesden–Popper series in the (Eu,Sr)n+1(Co,Fe)nO3n+1 system has been isolated and structurally characterized. X-ray diffraction and electron microscopy show that polycrystalline Eu2SrCo1.5Fe0.5O7 constitutes the n = 2 member of a homologous series, the essential feature of which is the existence of two connected Co/Fe octahedral layers with a perovskite-like structure, linked by an EuO rock-salt like layer. Random distributions of 3d-metals in the perovskite blocks and interstitial and oxygen vacancies in the rock-salt layers (anti Frenkel defects) are observed by electron microscopy. Such facts are commonly associated with high electronic conduction and ionic conductivity. The electrochemical study shows that the area-specific resistance of this compound is 0.26 Ω cm2 at 700 °C in air, a value which is comparable to those of the best state-of-the-art Ruddlesden–Popper materials used as cathodes in intermediate temperature solid oxide fuel cells.

Graphical abstract: Eu2SrCo1.5Fe0.5O7 a new promising Ruddlesden–Popper member as a cathode component for intermediate temperature solid oxide fuel cells

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Publication details

The article was received on 22 Nov 2018, accepted on 01 Feb 2019 and first published on 04 Feb 2019


Article type: Paper
DOI: 10.1039/C8TA11254A
Citation: J. Mater. Chem. A, 2019, Advance Article

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    Eu2SrCo1.5Fe0.5O7 a new promising Ruddlesden–Popper member as a cathode component for intermediate temperature solid oxide fuel cells

    K. Boulahya, D. Muñoz-Gil, A. Gómez-Herrero, M. T. Azcondo and U. Amador, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C8TA11254A

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