DOI: https://doi.org/10.15421/081910

THE SYNTHESIS AND ELECTROCATALYTIC ACTIVITY OF PbO2-POLYELECTROLYTE AND PbO2-SURFACTANT COMPOSITE COATINGS

Tatiana V. Luk’yanenko, Alexander B. Velichenko, Olesia B. Shmychkova, Carolina V. Yanova, Natalia I. Krivonosova

Abstract


The regularities of deposition of PbO2-polyelectrolyte and PbO2-surfactant composite coatings have been investigated. On CV several characteristic areas can be distinguished: at the anode region of CV at potentials higher than 1.4 V, an anode current is growing exponentially due to the simultaneous reactions of Pb(II) oxidation and oxygen evolution. At the cathodic branch of CV, a current maximum is observed at potentials of 1.0–1.2 V, corresponding to the reaction of the reduction of lead dioxide. When polyaminoguanidine hydrochloride is present in the electrolyte, the electrodeposition of lead dioxide is inhibited. In the presence of anionic polymer additive Nafion® in the electrolyte, one can see an increase in the peak of cathodic reduction of lead dioxide, which indicates an increase in the formation rate of PbO2. The addition to the deposition electrolyte of anionic surfactants leads to a slight inhibition of the process of deposition of PbO2. As one can see from the experimental data, the adsorption of anionic surfactants is satisfactorily described by the Langmuir isotherm. Values of the limiting adsorption and the adsorption equilibrium constant were calculated. According to the results obtained, anionic surfactants, cationic polyelectrolyte polyaminoguanidine hydrochloride and anionic polyelectrolyte Nafion® can be used as additives to the electrolyte during lead dioxide deposition. It has been established, that they included into the growing deposit, forming composite coatings with different composition and various electrocatalytic activity in oxygen evolution reaction. The content of organic compound in the oxide can vary from 2 to 16 w.%, forming a composite coating surfactant–oxide and polyelectrolyte–oxide. The oxygen evolution overpotential decreases in the line C4F9SO3K> C12H25O4SNa> C16H29O6SNa. It should be noted that the adsorption energy on PbO2 increases in the same line.


Keywords


polyelectrolyte; surfactant; lead dioxide; nitrate electrolyte; oxygen evolution reaction

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