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Stability and Functional Properties of Fluorite-Like Ce0.6 –xLa0.4PrxO2 – δ as Electrode Components for Solid Oxide Fuel Cells

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Abstract

In order to evaluate applicability of Ce0.6 –хLa0.4PrхO2 – δ (x = 0–0.2) fluorites for protective interlayers and electrode components for intermediate-temperature solid oxide fuel cells (SOFCs), their thermal expansion, chemical interaction with solid electrolyte material, tolerance towards reduction and electrochemical behavior were studied. The incorporation of praseodymium into Ce0.6La0.4O2 – δ was found to increase unit cell parameters and thermal expansion coefficients, from (13.2 ± 0.3) × 10–6 to (18.5 ± 0.8) × 10–6 К–1 at intermediate temperatures. Increasing total concentration of rare-earth cations in the fluorite-like cerium dioxide structure also correlates with decreasing thermodynamic stability under both oxidizing and reducing conditions. As a result, high-temperature chemical interaction between the Pr-doped materials and lanthanum gallate-based solid electrolyte becomes more intensive with respect to Ce0.6La0.4O2 – δ, whilst reduction of Pr-containing solid solution may leads to segregation of a secondary phase with the C-type structure. The combination of these factors deteriorates compatibility of the interlayers with other SOFC components. Consequently, the overpotentials of PrBaFe1.2Ni0.8O6 – δ cathodes in the electrochemical cells with (La0.9Sr0.1)0.98Ga0.8Mg0.2O3 – δ solid electrolyte were –42 and –143 mV in O2 atmosphere at the current density –58 mA/cm2 and 1073 K when the interlayers of Ce0.6La0.4O2 – δ or Ce0.5La0.4Pr0.1O2 – δ were used, respectively.

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Funding

This study was supported by the Russian Scientific Foundation (project no. 17-79-30071). The experimental setups used in this study were developed within the framework of the State Task for the Institute of Solid State Physics of the Russian Academy of Sciences.

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Authors and Affiliations

  1. Institute of Solid State Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia

    A. I. Ivanov, I. I. Zver’kova, E. V. Tsipis, S. I. Bredikhin & V. V. Kharton

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  1. A. I. Ivanov
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  2. I. I. Zver’kova
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  3. E. V. Tsipis
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  4. S. I. Bredikhin
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Correspondence to A. I. Ivanov.

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Translated by T. Safonova

Published on the basis of materials of the 5th All-Russia Conference “Fuel Cells and Power Plants Based on Them” (with international participation), Suzdal, 2018.

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Ivanov, A.I., Zver’kova, I.I., Tsipis, E.V. et al. Stability and Functional Properties of Fluorite-Like Ce0.6 –xLa0.4PrxO2 – δ as Electrode Components for Solid Oxide Fuel Cells. Russ J Electrochem 56, 139–146 (2020). https://doi.org/10.1134/S1023193520020056

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  • DOI: https://doi.org/10.1134/S1023193520020056

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