Electrochemical Activity of Metal-Ion Exchanger Nanocomposites

The electroreduction of oxygen on thin-film metal–polymer nanocomposites that differ in the metal (Ag, Cu, Pd), content, particle size of the metal component, and ionic form of the Lewatit K2620 matrix (H + , Na + ) was studied. The limiting oxygen diffusion current and effective number of electrons...

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Bibliographic Details
Published in:Russian journal of electrochemistry 2019-12, Vol.55 (12), p.1251-1257
Main Authors: Kravchenko, T. A., Vakhnin, D. D., Pridorogina, V. E., Shafrova, M. F.
Format: Article
Language:English
Subjects:
Chemical reduction
Chemistry
Chemistry and Materials Science
Constraining
Copper
Electrochemistry
Electrons
Electrowinning
Hydrogen evolution
Hydrogen peroxide
Ion exchangers
Nanocomposites
Nanoparticles
Oxidation
Oxygen
Palladium
Physical Chemistry
Polymer films
Reduction (metal working)
Silver
Thin films
Water chemistry
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Summary:The electroreduction of oxygen on thin-film metal–polymer nanocomposites that differ in the metal (Ag, Cu, Pd), content, particle size of the metal component, and ionic form of the Lewatit K2620 matrix (H + , Na + ) was studied. The limiting oxygen diffusion current and effective number of electrons involved in oxygen electroreduction were determined. The limiting current and the number of electrons increased with the content of metal nanoparticles and transition to larger nanoparticles. The oxygen electroreduction occurs by the four-electron mechanism, whereby the hydrogen peroxide intermediate product does not accumulate, and oxygen is reduced directly to water molecules. The electrochemical reduction of the metal oxidation products and hydrogen evolution can be observed depending on the ionic form of the matrix.
ISSN:1023-1935
1608-3342
DOI:10.1134/S1023193519120097