Abstract
The electrochemical behavior of titanium-chloroaluminate anion species in Lewis acidic 1-butyl-3-methylimidazolium chloride (BMIC)-aluminum chloride (AlCl3) ionic liquid (IL) electrolyte with 0.667 AlCl3 mole fraction is investigated at 383K by cyclic voltammetry (CV), chronoamperometry (CA), and chronopotentiometry (CP). The effect of scan rate on peak potential and peak current, constant current density, constant applied potential, and the electrolyte temperature are discussed. The redox reaction of the Ti2+/Ti0 deposition from titanium hepta-chloroaluminate ([Ti(Al2Cl7)4]2−) anions is a reversible process with a 2-electron transfer while that of Al3+/Al0 deposition from hepta-chloroaluminate ([Al2Cl7]−) anions is quasi-reversible with 3-electron transfer. The cyclic voltammograms indicated that the reduction of [Al2Cl7]− and [Ti(Al2Cl7)4]2− species to corresponding Al and Ti forms is a diffusion-controlled phenomenon. The diffusion coefficients (D) of the anion-species in BMIC-AlCl3 IL determined at 383 K using CV and CP methods are 9.74 × 10−10 m2 s−1 and 6.36 × 10−10 m2 s−1, respectively.
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