Voltammetric measurement in supercritical CO2 utilizing a water-in CO2 microemulsion

A novel method for voltammetric measurement in supercritical CO2 is describ ed. In this method a water-in-supercritical CO2 microemulsion is utilized t o raise the conductivity of the fluid phase. Well-defined voltammograms for the redox reactions of ferrocene and tetramethyl-p-phenylenediamine were o btained in supercritical CO2 in the presence of the microemulsion. The elec trolysis product is stabilized in the water core of the microemulsion. This implies a wide range of electrochemical synthesis involving ionic or radic al species in supercritical CO2 may be possible utilizing the microemulsion . The electrochemical results obtained from the water-in-supercritical CO2 microemulsion system are different from that obtained from a supercritical CO2-ethanol mixture system.