The electrochemistry of Te(IV) chloride in basic aluminum chloride-1-methyl-3-ethylimidazolium chloride molten salt was investigated at a glassy carbon electrode at 30°C. Absorption spectroscopy and titration experiments suggest that tellurium(IV) chloride is complexed as [TeCl6]2- in these melts. [TeCl6]2- can be reduced to elemental tellurium via a four-electron process. The nucleation process for the electrodeposition of Te from reduction of [TeCl6]2- exhibits characteristics indicative of kinetic control. Elemental Te can be further reduced to a Te(-II) species which undergoes a reaction with Te(IV) to form Te. Elemental Te can also be electrodeposited from oxidation of Te(-II). This process proceeds via 3D progressive nucleation with diffusion-controlled growth. The average Stokes-Einstein products for [TeCl6]2- and Te(-II) species are 1.7 × 10-10 and 3.6 × 10-10 g cm s-2 K-1, respectively.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Surfaces, Coatings and Films
- Materials Chemistry