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High-temperature electrical conductivity and electrochemical activity in oxygen redox reaction of La-doped Sr2FeCo0.5Mo0.5O6-δ

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Abstract

High-temperature electrical conductivity and electrochemical activity in the oxygen redox reaction of Sr2FeCo0.5Mo0.5O6-δ (SFCM) and Sr1.6La0.4FeCo0.5Mo0.5O6-δ (LSFCM) at variable oxygen partial pressure have been studied. We have found that the partial replacement of Sr2+ by La3+ results in a substantial decrease in the total electrical conductivity due to a decrease in the hole charge carrier concentration. Detailed analysis of the high- and low-frequency parts of the impedance spectra at pO2 = 0.1–1 atm and 873–1173 K has revealed different rate-limiting steps in the oxygen redox reaction for SFCM and LSFCM resulted from different oxygen vacancy concentrations in these materials. For SFCM, the oxygen redox reaction is limited by the processes of adsorption and dissociation of oxygen molecules, while for LSFCM by the charge transfer occurring at the triple phase boundary.

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Funding

This work has been financially supported by RFBR project # 20–03-00432 and partially by the Interdisciplinary Scientific and Educational School of Moscow University “Future Planet: Global Environmental Changes.” N.V.L. is grateful for financial support the state task for IPCP RAS, state registration no. AAAA-A19-119061890019–5.

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Authors and Affiliations

  1. Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1, stroenie 3, 119992, Moscow, Russian Federation

    M. M. Abdullaev, S. Ya. Istomin & E. V. Antipov

  2. Institute of Problems of Chemical Physics, Russian Academy of Sciences, prosp. Akademika Semenova 1, 142432, Chernogolovka, Moscow Region, Russian Federation

    N. V. Lyskov

  3. HSE University, ul. Myasnitskaya 20, 101000, Moscow, Russian Federation

    N. V. Lyskov & S. Ya. Istomin

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  1. M. M. Abdullaev
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Correspondence to S. Ya. Istomin.

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Abdullaev, M.M., Lyskov, N.V., Istomin, S.Y. et al. High-temperature electrical conductivity and electrochemical activity in oxygen redox reaction of La-doped Sr2FeCo0.5Mo0.5O6-δ. J Solid State Electrochem 26, 2771–2779 (2022). https://doi.org/10.1007/s10008-022-05284-x

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