The mechanism of electroreduction of nitrate ions on a hybrid electrode nanodispersed copper-MK-40 membrane |
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Authors: | M Yu Chaika E V Bulavina A S Solyanikova T A Kravchenko P V Seredin |
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Institution: | 1.Voronezh State University,Voronezh,Russia |
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Abstract: | Based on a MK-40 sulfocation-exchange membrane, a hybride electrode material containing nanodispersed copper is prepared.
The methods of scanning electron microscopy and X-ray diffraction (XRD) analysis reveal the formation of copper agglomerates
measuring 250–470 nm and consisting of individual particles of 20–30 nm. The procedure of multistage chemical deposition of
copper into the ion-exchange carrier makes it possible to obtain a continuous cluster of metal particles which determines
the electron conducting properties of the resulting hybrid material. The electrochemical activity of the nanocomposite electrode
is studied in the reaction of nitrate ion electroreduction. Nanodispersed copper deposited into the membrane is shown to intensify
the electroreduction of nitrate ions by a factor of 1.5–2 as compared with a compact copper electrode. The electroreduction
of nitrate ions on compact copper is shown to involve 6 electrons, whereas the electroreduction on the nanocomposite involves
8 electrons. The electroreduction products of nitrate ions are identified by the IR spectroscopy method. |
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