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

doi:10.1039/c9cp06650k

Oxygen surface exchange kinetics of Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−δ

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

^*Corresponding author for this work

Inorganic Membranes

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Abstract

The mechanism of oxygen exchange between the gas phase and Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−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 language	English
Pages (from-to)	10158-10169
Number of pages	12
Journal	Physical chemistry chemical physics
Volume	22
Issue number	18
DOIs	https://doi.org/10.1039/c9cp06650k
Publication status	Published - 14 May 2020

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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.",

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T1 - Oxygen surface exchange kinetics of Ba0.5Sr0.5Co0.8Fe0.2O3−δ

AU - Eremin, V.A.

AU - Ananyev, M.V.

AU - Bouwmeester, H.J.M.

AU - Kurumchin, E.K.

AU - Yoo, Ch.-Y.

PY - 2020/5/14

Y1 - 2020/5/14

N2 - 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.

AB - 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.

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JF - Physical chemistry chemical physics

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ER -

Oxygen surface exchange kinetics of Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−δ

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