Electrodeposition of Aluminum from AlCl₃-1-Ethyl-3- Methylimidazolium Fluoride

摘要

The electrodeposition of aluminum was successfully achieved in AlCl 3 -1-ethyl-3-methylimidazoliumfluoride (EmimF) at a potential of –0.3V (vs. Al/Al 3+ ) and a temperature of 90 ℃. Cyclic voltammetry,chronopotentiometry and chronoamperometry were used to investigate the electrochemical behavior ofAl 2 Cl 7 - . Cyclic voltammetry and chronopotentiometry measurements indicate that the reduction ofAl 2 Cl 7 - to metallic Al in AlCl 3 -EmimF (molar ratio 2.7) is a one-step three-electron transfer andirreversible diffusion-controlled process. The chronoamperometry results show that the deposition ofaluminum on a Pt electrode involves instantaneous three-dimension nucleation. In addition, X-raydiffraction (XRD) analysis confirmed that the deposit is pure aluminum, while scanning electronmicroscope (SEM) images reveal that dense and compact deposits were obtained at a more negativepotential.