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Electrode kinetics at the Pt, O2|La0.9Sr0.1ScO3-δ interface

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Abstract

Most of the ceramic proton conductors reveal considerable hole conductivity in an oxidizing ambient. This results in a necessity of taking into account the nonfaradaic current when studying the electrode kinetics in electrochemical cells with high-temperature protonic electrolytes. The present paper is an attempt to elucidate the electrode kinetics of oxygen reaction at a Pt, O2|La0.9Sr0.1ScO3-δ (LSS10) interface. The polarization conductivity has been determined as a function of temperature (600–900 °C) and oxygen partial pressure (2.1 × 104 > pO2 > 1 Pa) by means of impedance spectroscopy using the elementary model in terms of an equivalent electrical circuit with the bypass resistance of hole transport in the electrolyte. Possible routes of oxygen reaction at the Pt, O2|La0.9Sr0.1ScO3-δ interface have been discussed, and diffusion of the electron holes in LSS10 was proposed as the rate-determining stage of the electrode process.

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Acknowledgements

Authors are grateful to A.Yu. Stroeva for providing the samples for the experiments and to V.P. Gorelov for his helpful comments during the work on this paper.

The study was financially supported by the grant of the Russian Science Foundation, project no. 16-13-00053, and by Act 211 Government of the Russian Federation (agreement no. 02.A03.21.0006) using facilities of shared access center “Composition of Compounds” of IHTE UB RAS.

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Authors and Affiliations

  1. Institute of High Temperature Electrochemistry, Ural Branch of Russian Academy of Sciences, Ekaterinburg, Russia, 620137

    E. P. Antonova & D. I. Bronin

  2. Ural Federal University, Ekaterinburg, Russia, 620002

    E. P. Antonova & D. I. Bronin

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  1. E. P. Antonova
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  2. D. I. Bronin
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Correspondence to E. P. Antonova.

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Antonova, E.P., Bronin, D.I. Electrode kinetics at the Pt, O2|La0.9Sr0.1ScO3-δ interface. J Solid State Electrochem 21, 2457–2462 (2017). https://doi.org/10.1007/s10008-017-3593-4

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  • DOI: https://doi.org/10.1007/s10008-017-3593-4

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