Abstract
The trends in adsorption and oxidation of oligoethylene glycols (OEG), namely, di-, tri-, and tetraethylene glycol, on a Pt/Pt electrode are studied. Using a combination of methods of open-circuit potential shifts at the adsorption of organic species and anodic voltammetric curves, it is established that the OEG adsorption on a Pt/Pt electrode is accompanied by hydrogenation, dehydrogenation, and partial destruction of molecules and also that the amount and composition of accumulated adsorbate depend on the initial adsorption potential and the polymer structure. The OEG oxidation on a platinum electrode is considerably hindered as compared with ethylene glycol. The reaction rate decreases with an increase in the OEG molecular mass and is largely limited by the adsorption of molecules on the electrode surface, which is evidenced by the weak dependence of the rate on the potential in the double layer region.
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