Redox sorption of oxygen by Pd- and Cu-containing nanocomposites in the over-limiting current mode of electrochemical polarization
Abstract
Objectives: Palladium- and copper-containing nanocomposites have been synthesized with different capacities for a metal component chemically deposited in a macroporous sulfocation exchange matrix.
Experimental: It has been revealed that in the over-limiting mode of electrochemical polarization, the reduction of oxygen dissolved in water on a palladium-containing nanocomposite proceeds by a catalytic mechanism. In addition to the targeted O2 cathodic reduction process, adsorbed hydrogen is formed, which reacts catalytically with oxygen, which contributes to an additional decrease in O2 concentration. It was found that in the over-limiting polarization mode of the Pd-containing nanocomposite, the oxygen concentration decreases significantly compared to the limiting mode.
Conclusions: The specific amount of absorbed oxygen increases with a decrease in the content of the deposited metal, which is associated with the high adsorption capacity of atomic hydrogen by weakly associated palladium nanoparticles. When using copper instead of palladium, the effectiveness of water deoxygenation decreases.
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