RDE VOLTAMMETRY AND IMPEDANCE SPECTROSCOPY STUDIES OF Sb, Te AND SbTe ELECTRODEPOSITION FROM CHOLINE CHLORIDE – UREA IONIC LIQUIDS

摘要

The paper presents the investigation of electrode processes during electrodeposition of antinomy, tellurium and antimony telluride on Pt and glassy carbon electrodes from ionic liquids containing a mixture of choline chloride with urea (1:2 mole ratio). SbCl3 and TeO2 in 2-5 millimolar concentration were introduced as precursors in the supporting electrolyte. Cyclic voltammetry, voltammetry with rotating disk electrode and electrochemical impedance spectroscopy techniques were used at 600C to evidence the deposition/dissolution processes on both Pt and glassy carbon electrodes. SbTe induced codeposition takes place on a Te layer which can partial or fully cover the electrode surface. Experimental data suggested that the electrodeposition of Sb and Te elements and SbTe compound are kinetically less favored if glassy carbon electrode is used instead of platinum.