Anion effect on the redox properties of copper ions in ionic liquids and deep eutectic solvents

Abstract

It has long been claimed that the anion of the DES or IL is critical for controlling the redox properties of metal ions. In this study we investigate the effect...

Comparative Study of the Underpotential Deposition of Bi in an Aqueous Electrolyte and an Ionic Liquid

“…In [BMIM]­BF 4 , it was reported that the solubility of CuCl 2 ·2H 2 O is small, and the Cl – primarily coordinated the Cu 2+ cations using an X-ray adsorption spectroscopy measurement . For the electrodeposition of Cu 2+ in ILs, CVs were measured for a range of imidazolium-based ILs with various anions and different coordination strengths . CVs exhibit different redox properties depending on the anion species.…”

“…a range of imidazolium-based ILs with various anions and different coordination strengths 49. CVs exhibit different redox properties depending on the anion species.…”

A toolbox for improved recycling of critical metals and materials in low-carbon technologies

“…123 When using ionic uids to dissolve metal oxides, one of the critical parameters to metal solvation is the anionic component of the system. 124,125 However, the downsides to these systems is the high viscosity [126][127][128] and inevitably higher material costs relative to aqueous media. If ILs or DESs are to be used, care must be taken to ensure that the 'green' credentials are not overstated, and that the economic benets are maximised, either by a decrease in the energy needed for the process, reducing the amount of chemical additives required, or through the processing of small, concentrated amounts of high value materials.…”

Concentrated Ionic Fluids: Is There a Difference Between Chloride‐Based Brines and Deep Eutectic Solvents?

“…Ionic liquids (ILs) and deep eutectic solvents (DESs) are lauded as novel solvents for metal processing due to their low water content and the ability to control speciation. [1] Recent work has confirmed that metal speciation and electrochemistry is controlled by the solvent anion, [2] and that the presence of small amounts of water (<10 wt %) does not affect the species present. [ 3 , 4 , 5 ] The original definitions of ionic liquids and DESs[ 6 , 7 , 8 , 9 ] do not appear to be helpful and a recent overview suggested that there is a continuum spanning ionic liquids, protonic ionic liquids, DESs, salt hydrates and brines.…”