VOLTAMETRIC BEHAVIOR OF PLATINIZED TITANIUM ELECTRODES
DOI:
https://doi.org/10.15421/081912Keywords:
platinized titanium, composites, inversion voltammetry, potentiostat, Mott–Schottky approachAbstract
A method for the combined synthesis of dimensionally stable anodes with an active TixOy/Pt layer on metal substrates is proposed, which consists of electrolytically depositing a thin layer of platinum on the substrate followed by termal treatment in air, which allows one to control the composition and properties of obtained materials. The platinum content decreases from surface to substrate with an increase in the ratio of metallic titanium and TiO2. It has been determined that coatings with a platinum content of up to 8 mg cm-2 are represented by titanium almost completely coated with platinum with faults and troughs. Termal treatment leads to significant changes in the surface morphology, because of distribution of Pt over the surface and in the bulk due to diffusion and sintering, as well as an increase in the degree of crystallinity. It has been shown that semiconductor properties of composite TixOy/Pt electrodes on a titanium substrate are due to the formation of titanium dioxide, which is an n-type semiconductor. It has been established that with increasing of platinum coating thickness and temperature of treatment, the potential of flat zones and the number of carriers also increase. Anomalously high values of the slopes of the polarization curves are explained by to the presence of a space charge zone in the semiconductor. The data obtained indicate the possibility of using the reduction peak of oxygen-containing platinum compounds on the inversion voltammogram as a correlation parameter for predicting the electrocatalytic activity of termally treated Ti/Pt electrodes in oxygen transfer reactions.
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