Rate-Determining Steps of Oxygen Surface Exchange Kinetics on Sr 2 Fe 1.5 Mo 0.5 O 6??

Denis A. Osinkin, Anna V. Khodimchuk, Natalia M. Porotnikova, Nina M. Bogdanovich, Andrey V. Fetisov and Maxim V. Ananyev
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Denis A. Osinkin: Institute of High-Temperature Electrochemistry UB RAS, Yekaterinburg 620137, Russia
Anna V. Khodimchuk: Institute of High-Temperature Electrochemistry UB RAS, Yekaterinburg 620137, Russia
Natalia M. Porotnikova: Institute of High-Temperature Electrochemistry UB RAS, Yekaterinburg 620137, Russia
Nina M. Bogdanovich: Institute of High-Temperature Electrochemistry UB RAS, Yekaterinburg 620137, Russia
Andrey V. Fetisov: Institute of Metallurgy UB RAS, Yekaterinburg 620016, Russia
Maxim V. Ananyev: Institute of High-Temperature Electrochemistry UB RAS, Yekaterinburg 620137, Russia

Energies, 2020, vol. 13, issue 1, 1-10

Abstract: The oxygen surface kinetics of Sr 2 Fe 1.5 Mo 0.5 O 6−δ was determined using the 16 O 2 / 18 O 2 isotope exchange method with gas phase analysis at 600–800 °C. The heterogeneous exchange rates ( r H ) and the oxygen diffusion coefficients ( D ) were calculated by processing the concentration dependences of the 18 O fraction using Ezin’s model. The rates of oxygen dissociative adsorption ( r a ) and incorporation ( r i ) were calculated based on a model using the three exchange type rates. It has been established that the rates r a and r i were comparable in this temperature range. Assumptions were made about the effect of the chemical composition of the surface on the rate of oxygen adsorption. It was found that the oxygen exchange coefficient ( k ) of Sr 2 Fe 1.5 Mo 0.5 O 6−δ is comparable to that of La 0.6 Sr 0.4 MnO 3±δ oxide. High values of the oxygen diffusion coefficient were found for Sr 2 Fe 1.5 Mo 0.5 O 6−δ . The values were comparable to those of the double cobaltite praseodymium-barium and exceed by more than an order those of lanthanum-strontium manganite.

Keywords: Sr 2 Fe 1.5 Mo 0.5 O 6??; oxygen surface kinetics; heterogeneous exchange rate; oxygen diffusion coefficient; oxygen adsorption; oxygen incorporation; X-ray photoelectron spectroscopy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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