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Electroreduction of molecular oxygen on metal-ion exchanger nanocomposites
Abstract The dioxygen electroreduction reaction has been studied on nanosized metal (Cu0, Ag0)-ionexchange matrix (macroporous sulfonated cation-exchange resin KU-23, sulfonated cation-exchange membrane MK-40) electrode materials. An increase in the half-wave potential of oxygen electroreduction from ∼0.10 to 0.29 V on passing from the Na+-to the H+-form of the Me0-ion exchanger nanocomposite indicates the involvement of the H+-ion in the step of attachment of the first electron to the oxygen molecule O2. The reaction of oxygen on the copper-KU-23 nanocomposite is accompanied by the appearance of an additional wave in the polarization curve of oxygen electroreduction in a neutral medium, which is associated with stabilization of hydrogen peroxide, a reaction intermediate, on nanosized copper. In the region of limiting current potentials, the rate-determining step of the array of electrochemical, chemical, and external- and internal-diffusion processes occurring during the electroreduction of oxygen is the external diffusion of O2 molecules to the electrode surface.
Electroreduction of molecular oxygen on metal-ion exchanger nanocomposites
Abstract The dioxygen electroreduction reaction has been studied on nanosized metal (Cu0, Ag0)-ionexchange matrix (macroporous sulfonated cation-exchange resin KU-23, sulfonated cation-exchange membrane MK-40) electrode materials. An increase in the half-wave potential of oxygen electroreduction from ∼0.10 to 0.29 V on passing from the Na+-to the H+-form of the Me0-ion exchanger nanocomposite indicates the involvement of the H+-ion in the step of attachment of the first electron to the oxygen molecule O2. The reaction of oxygen on the copper-KU-23 nanocomposite is accompanied by the appearance of an additional wave in the polarization curve of oxygen electroreduction in a neutral medium, which is associated with stabilization of hydrogen peroxide, a reaction intermediate, on nanosized copper. In the region of limiting current potentials, the rate-determining step of the array of electrochemical, chemical, and external- and internal-diffusion processes occurring during the electroreduction of oxygen is the external diffusion of O2 molecules to the electrode surface.
Electroreduction of molecular oxygen on metal-ion exchanger nanocomposites
Chaika, M. Yu. (author) / Novikova, V. V. (author) / Polyanskii, L. N. (author) / Kravchenko, T. A. (author)
Petroleum Chemistry ; 51 ; 519-526
2011-11-27
8 pages
Article (Journal)
Electronic Resource
English
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