Electrochemical determination of ferrocene diffusion coefficient in [C6MIM][PF6]-CO2 biphasic system

► Electroanalytical study is carried out in green media with x(CO2) = 0.7. ► Electroactive species concentration in the heavy phase depends on applied CO2 pressure. ► Increase in CO2 pressure up to optimum pressure enhances electron process. ► Decreased viscosity effect of CO2 solubilization favours ferrocene diffusion.