Effect of the electrode material on the oxygen reduction at the nonstoichiometric lanthanum fluoride/electrode interface |
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Authors: | M S Turaeva I A Pegova M M Urchukova I V Murin |
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Institution: | (1) Research Institute of Agrophysics, Russian Academy of Agricultural Sciences, Grazhdanskii pr. 14, St. Petersburg, 195220, Russia;(2) St. Petersburg State University, Universitetskii pr. 2, St. Petersburg, 198904, Russia |
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Abstract: | The voltammetry method with a linear potential scan is used for investigating the effect the electrode material (Ni, Co, electrodes on the basis of cobalt oxides modified with carbon) exerts on the reduction of gaseous oxygen at interfaces solid fluoride-conducting electrode LaF3:Eu2+/electrode, O2, and conjugated processes. Properties of the modified electrodes are characterized by the impedance spectroscopy, scanning electron microscopy, and x-ray photoelectron spectroscopy methods. The oxygen reaction is irreversible at the LaF3:Eu2+|Ni (or Co) interfaces. At the interface of LaF3:Eu2+ with modified electrodes Co (C n at %), where n = 5 and 9, mobile forms of oxygen are reversible and the reduction of gaseous and chemisorbed oxygen is controlled by diffusion with different effective kinetic parameters. |
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Keywords: | gaseous oxygen reduction nonstoichiometric fluoride modified electrode voltammetry |
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