Effect of AO Segregation on Catalytical Activity of La0.7A0.3MnO3±δ (A = Ca, Sr, Ba) Regarding Oxygen Reduction Reaction
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Oxygen surface exchange kinetics of La0.7A0.3MnO3±δ has been studied by the isotope exchange method with gas phase equilibration using a static circulation experimental rig at the temperature of 850 °C and oxygen pressure of 1 kPa. Oxides of La0.7A0.3MnO3±δ with different dopant at one level of doping were considered. Rates of elementary acts of the oxygen exchange were found to change differently. So, the oxygen dissociative adsorption rate increased, the oxygen incorporation rate decreased, and the increase in the cation radius did not influence the interphase exchange rate. These trends are associated with the AO segregation processes at the surface and the appropriate mechanism of oxygen reduction is considered.
The oxygen dissociative adsorption rate increased, the incorporation rate decreased, and the increase in the cation radius did not influence the interphase exchange rate. These trends are associated with the AO segregation processes at the surface.
KeywordsCatalysis Oxygen reduction reaction Kinetics Cation segregation Manganite
The facilities of the shared access centers “Composition of Compounds” of IHTE UB RAS “Siberian Synchrotron and Terahertz Radiation Centre (SSTRC)” based on BINP SB RAS were used in this work. The work was done using Unique scientific setup “Isotopic exchange” of the Shared access center “Composition of Compounds”. The part of the work related to the measurements of spectra and the exposure of samples was performed using the infrastructure of the Shared-Use Center “Siberian Synchrotron and Terahertz Radiation Center (SSTRC)” based on VEPP-3/VEPP-4M/NovoFEL of BINP SB RAS. The isotope exchange study is supported by the grant of the Russian Science Foundation (Project Number 16-13-00053) and Scholarship of Russian President 2018–2020 СП-2316.2018.1 and President Grant МД-6758.2018.3. The educational activities of Ph.D. and master students involved into this work are supported by the Act 211 of the Government of the Russian Federation, Agreement No. 02.A03.21.0006.
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