Rate-Determining Steps of Oxygen Surface Exchange Kinetics on Sr2Fe1.5Mo0.5O6−δ

Autor: D.A. Osinkin, Andrey V. Fetisov, A. V. Khodimchuk, N. M. Porotnikova, Nina Bogdanovich, Maxim V. Ananyev
Rok vydání: 2020
Předmět:
X-ray photoelectron spectroscopy
DIFFUSION IN GASES
GAS ADSORPTION
Analytical chemistry
Sr2Fe1.5Mo0.5O6−δ
02 engineering and technology
OXYGEN SURFACE
lcsh:Technology
oxygen incorporation
EXCHANGE RATES
01 natural sciences
Oxygen
OXYGEN
oxygen adsorption
OXYGEN SURFACE KINETICS
chemistry.chemical_compound
OXYGEN DIFFUSION COEFFICIENT
oxygen surface kinetics
MANGANITES
Chemical composition
PHOTOELECTRON SPECTROSCOPY
021001 nanoscience & nanotechnology
Manganite
HETEROGENEOUS EXCHANGE RATE
X‐RAY PHOTOELECTRON SPECTROSCOPY
OXYGEN INCORPORATION
0210 nano-technology
oxygen diffusion coefficient
Control and Optimization
OXYGEN DIFFUSION COEFFICIENTS
heterogeneous exchange rate
OXYGEN ADSORPTION
SR2FE1.5MO0.5O6−Δ
Kinetics
Oxide
Energy Engineering and Power Technology
chemistry.chemical_element
010402 general chemistry
FINANCE
Electrical and Electronic Engineering
Engineering (miscellaneous)
KINETICS
lcsh:T
Renewable Energy
Sustainability and the Environment
Atmospheric temperature range
0104 chemical sciences
Cobaltite
chemistry
Energy (miscellaneous)
Zdroj: Energies
Volume 13
Issue 1
Energies, Vol 13, Iss 1, p 250 (2020)
ISSN: 1996-1073
DOI: 10.3390/en13010250
Popis: The oxygen surface kinetics of Sr2Fe1.5Mo0.5O6&minus
&delta
was determined using the 16O2/18O2 isotope exchange method with gas phase analysis at 600&ndash
800 °
C. The heterogeneous exchange rates (rH) and the oxygen diffusion coefficients (D) were calculated by processing the concentration dependences of the 18O fraction using Ezin&rsquo
s model. The rates of oxygen dissociative adsorption (ra) and incorporation (ri) were calculated based on a model using the three exchange type rates. It has been established that the rates ra and ri 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 Sr2Fe1.5Mo0.5O6&minus
is comparable to that of La0.6Sr0.4MnO3±
oxide. High values of the oxygen diffusion coefficient were found for Sr2Fe1.5Mo0.5O6&minus
The values were comparable to those of the double cobaltite praseodymium-barium and exceed by more than an order those of lanthanum-strontium manganite.
Databáze: OpenAIRE
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