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Novel ReBaCo1.5Mn0.5O5+δ (Re: La, Pr, Nd, Sm, Gd and Y) perovskite oxide: influence of manganese doping on crystal structure, oxygen nonstoichiometry, thermal expansion, transport properties, and application as cathode materials in Solid Oxide Fuel Cells

Abstract

In this work, a novel series of Mn-containing ReBaCo1.5Mn0.5O5+δ (Re: selected rare earth elements) perovskite-type oxides is studied, with systematic measurements of the physicochemical properties reported. Comparison with the very well-studied, parent ReBaCo2O5+δ allows to determine role of the introduced manganese concerning modification of the crystal structure at room temperature and its evolution at high temperatures, variation of the oxygen content, thermal stability of the materials, total electrical conductivity, as well as thermal and chemical expansion. Generally, presence of Mn cations does not affect tendency for the A-site cation ordering, results in an increased unit cell volume of the compounds, as well as causes an increase of the oxygen content. Reduced thermal expansion, together with high values of the electrical conductivity and suitable thermal stability make the compounds containing larger Re3+ cations attractive from a point of view of application as cathode materials in Solid Oxide Fuel Cells. Chemical compatibility studies reveal sufficient stability of the considered perovskites in relation to Ce0.8Gd0.2O2-δ solid electrolyte, while unexpected, increased reactivity towards La0.8Sr0.2Ga0.8Mg0.2O3-δ and La0.8Ce0.2O3-δ is also reported. Furthermore, electrochemical tests of the symmetric cells show strong dependence of the electrode’s polarization on the synthesis and sintering temperatures. For the selected and optimized NdBaCo1.5Mn0.5O5+δ layer, the cathodic polarization is 0.043 Ω cm2 at 900 °C.

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Publication details

The article was received on 16 Apr 2018, accepted on 03 Jun 2018 and first published on 04 Jun 2018


Article type: Paper
DOI: 10.1039/C8TA03479F
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Novel ReBaCo1.5Mn0.5O5+δ (Re: La, Pr, Nd, Sm, Gd and Y) perovskite oxide: influence of manganese doping on crystal structure, oxygen nonstoichiometry, thermal expansion, transport properties, and application as cathode materials in Solid Oxide Fuel Cells

    A. Olszewska, Z. Du, K. Świerczek, H. Zhao and B. Dabrowski, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA03479F

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