Study of the BMIM-PF6: Acetonitrile binary mixture as a solvent for electrochemical studies involving CO2

► Acetonitrile + BMIM-PF6 was studied as a binary solvent system for CO2. ► Full range of binary mixtures (0-100% CH3CN) considered. ► Physical properties measured: density, viscosity, conductivity, CO2 solubility. ► Azobenzene used as a model to consider suitability as an electrochemical solvent. ► 15-20% (v/v) CH3CN in BMIM-PF6 is optimum range for CO2 solubility and electrochemistry.