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.
Highlights
Oxidation reactions play an important role in chemical industrial processes
Experimental amperometric response curves could be divided into three regions: (I and III) the first and third region is monotone-decreasing relations, following equation for the electrode process controlled by linear diffusion [21] (Fig.2); (II) at the second region the increase of the curve was observed; Figure 3
The reaction of electrooxidation of Mn2+ ions in this context may be termed as a “marker” for oxygen transfer reactions
Summary
Oxidation reactions play an important role in chemical industrial processes. the processes, involving traditional mostly toxic oxidant and by-products, cause high levels of environmental pollution. The implementation of a transition metal-based catalyst in combination with oxygen is an alternative to the traditional procedures [1,2,3,4,5,6]. Such systems are an essential condition for implementation of sustainable green chemical processes. The development of these systems is a driving force for fabrication of novel and efficient catalytic materials. It is important to understand the properties of transition metal oxides and to improve catalytic activity, basing on their features
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