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Nanostructured catalysts for oxygen electroreduction based on bimetallic monoethanolamine complexes of Co(III) and Ni(II) |
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| Authors: | Yu Pirskyy N Murafa O M Korduban J ?ubrt |
| Affiliation: | 1. V.I. Vernadskii Institute of General and Inorganic Chemistry, National Academy of Sciences of Ukraine, Palladina Ave 32-34, Kiev 142, 03680, Ukraine 2. Institute of Inorganic Chemistry of the ASCR v.v.i., Husinec-?e? ?.p. 1001, 25068, ?e?, Czech Republic 3. G.V. Kurdyumov Institute of Metal Physics, National Academy of Sciences of Ukraine, Bul’var Akademika Vernads’kogo, 36, Kiev 142, 03680, Ukraine |
| Abstract: | Oxygen reduction electrocatalysts based on the monoethanolmine complexes {CoEtm]2(μ-Etm)4Ni(NO3)2} and {CoEtm]2(μ-Etm)4Ni(NO3)2} + activated carbon AG-3 have been obtained by high-temperature synthesis. The nature of active centers on the synthesized electrocatalysts was described. Using potentiostatic and cyclic potentiodynamic voltammetry, the kinetic characteristics of catalysts in the oxygen electroreduction reaction were determined. Thermal decomposition of the thermally unstable complexes was described and character of the active centers formed was discussed. The optimal synthesis temperature of electrocatalysts is 600 °C in an inert atmosphere. The calculated exchange current densities for the oxygen electroreduction reaction at the catalysts in 1 M KOH at 20 °C was j 0 = 1.01 × 10?3 A g?1–3.3 × 10?3 A g?1. The Tafel slopes of stationary polarization curves are 0.054–0.063 V for b 1 and 0.106–0.125 V for b 2 . The prepared electrocatalysts can be recommended only for electrochemical systems with alkaline electrolyte. |
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