Oxygen surface exchange kinetics of Ba0.5Sr0.5Co0.8Fe0.2O3−δ

V.A. Eremin*, M.V. Ananyev, H.J.M. Bouwmeester, E.K. Kurumchin, Ch.-Y. Yoo

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

The mechanism of oxygen exchange between the gas phase and Ba0.5Sr0.5Co0.8Fe0.2O3−δoxide was evaluated by considering the inhomogeneity of the oxide surface. The applicability of existing models for the analysis of the oxygen exchange mechanism was considered. A new model with a dissociation step was suggested. The rate-determining steps of the oxygen exchange process were revealed under different experimental conditions. The change in the rate-determining step occurred at 600-650 °C. The probable cause was considered taking into account the parameter of nonequivalency of adsorption centers. A relationship between the oxygen isotope redistribution rates and the rates of the elementary steps in a “gas phase-solid oxide” system was revealed.

Original languageEnglish
Pages (from-to)10158-10169
Number of pages12
JournalPhysical chemistry chemical physics
Volume22
Issue number18
DOIs
Publication statusPublished - 14 May 2020

Keywords

  • n/a OA procedure

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