Selenium electrochemistry in choline chloride–urea deep eutectic electrolyte

摘要: The electrochemical behaviour of selenium in the deep eutectic solvent made a 1:2 molar ratio choline chloride and urea (ChCl–U) has been investigated at polycrystalline gold electrode by voltammetry chronoamperometry. In order to favour deposition grey selenium, oxide was chosen as solution precursor temperature range from 70 110 °C selected. Cyclic voltammograms recorded chloride–urea liquid containing 10 mM SeO2 are strongly affected temperature. At °C, three main cathodic responses evidenced around −0.075, −0.2 −0.7 V. These peaks have attributed respectively underpotential (upd) Se, bulk Se stripping associated formation Se(−II). Potentiostatic current transients obtained indicative nucleation with diffusion-controlled growth mechanism for electrodeposition support upd layer preceding deposition. dissolution triggered double potential step perturbations could however not be interpreted on basis similar formalism.