Universal Journal of Chemistry Vol. 6(2), pp. 15 - 20
DOI: 10.13189/ujc.2018.060201
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Express-method for Estimation of Electrocatalytic Activity of Oxide Films toward Oxygen Transfer Reactions


Veronika Poltavets 1,*, Viktor F. Vargalyuk 2, Lyudmila Shevchenko 2
1 Research Laboratory of Geology Research Institute, Oles Honchar Dnipro National University, Dnipro, Ukraine
2 Chemical Department, Oles Honchar Dnipro National University, Dnipro, Ukraine

ABSTRACT

Oxidation catalysis of organic substances has attracted special attention in recent years due to of their high industrial significance in green and energy chemistry. The implementation of a transition metal-based catalyst in combination with oxygen is an alternative to the traditional procedures. This study justifies the application of amperometric response 'in situ' for estimation of the electrocatalytic activity of metal oxide films, which are known to be promising for oxygen transfer processes. The reaction of electrooxidation of Mn2+ ions may be termed as a 'marker' for oxygen transfer reactions due to its kinetic features, such as proportionality between the current density and the surface concentration of •OH-radicals. The relative parameter, kox, has been offered for estimation of the oxidizing capacity of an anode material toward oxygen transfer reaction in reference to platinum oxidizing capacity. kox value is automatically calculated exactly during electroplating of MnOx as a ratio of the current density of Mn2+ + 2H2O – 2e→MnO2+4H+ reaction on the tested surface to the current density of this reaction on Pt surface. The developed method was tested during the investigation of catalytic activity of MnOx films for electrooxidation of glucose. The parameter kox was calculated for other anode materials and was analyzed. The application of the new method allows estimating and comparing the catalytic performance toward oxygen transfer reactions of anode materials or of the same material in different modifications, such as nano particles, composites, different compositions etc. The pre-test reduces manifold the time spent for determination of oxidizing capacity of oxides.

KEYWORDS
Manganese Oxides, Electrocatalytic Oxidation, Oxygen Transfer Reactions

Cite this paper
Veronika Poltavets , Viktor F. Vargalyuk , Lyudmila Shevchenko (2018). Express-method for Estimation of Electrocatalytic Activity of Oxide Films toward Oxygen Transfer Reactions. Universal Journal of Chemistry, 6 , 15 - 20. doi: 10.13189/ujc.2018.060201.