Four kinds of solvents, methylene chloride (CH Cl ), toluene (TOL), ethyl acetate (EtoAc), and dimethyl carbonate (DMC), were 2 2 added into the 1-butyl-3-methylimidazolium chloroaluminate ionic liquid ([BMIM]Cl/AlCl IL) to improve the property of the IL-based electrolyte for aluminum (Al) electrolysis. Solvation effects of these solvents on the physical properties, electrochemical properties, and electroactive ion of the [BMIM]Cl/AlCl IL-based electrolyte were investigated. It was found that the viscosity of the IL electrolyte decreased after adding CH Cl or TOL, and the conductivity increased while the change of the conductivity and 2 2 the viscosity moved in the opposite direction with the addition of EtoAc or DMC. The UV-Vis spectra showed that the electroactive Al ion continued existence after adding CH Cl or TOL, but there was solvation effect between TOL and 2 2 + + BMIM . On the other hand, both EtoAc and DMC had solvation effects with electroactive Al ion and BMIM . The results illustrated that solvation effect was the key effect on the reduction of Al on the cathode, and further influenced the morphology of the Al deposits. In addition, the concentration polarization reduced and the efficiency of electrolysis improved after adding CH Cl
Ionics – Springer Journals
Published: Jun 4, 2018
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