Laleh Bahadori
University of Malaya, Malaysia
Title: Electrochemical characteristics and transport properties of non-aqueous all-vanadium redox cell in ammonium based deep eutectic solvents
Biography
Biography: Laleh Bahadori
Abstract
Three different deep eutectic solvents (DESs) synthesized from ammonium salts are employed as electrolytes for an H-type redox battery using vanadium acetylacetonate [V(acac)3] as the electro-active species. Preliminary investigation show that the highest solubility of [V(acac)3] is in a DES made from choline chloride and ethylene glycol (ethaline). Cyclic voltammetry indicate that ethaline is stable in an operating potential range of -1.8 to +1 V. The diffusion coefficients of V(acac)3 in the electrolyte has been estimated to 0.69 cm2s-1 at room temperature. Charge/discharge performance using the static H-type electrochemical cell gives coulombic efficiencies near 50%. In comparison to results obtained with acetonitrile as a solvent, the DES seems to show similar performance (despite being cycled at least 12 times). This is encouraging because DES is safer to work with and significantly more environment friendly than acetonitrile.