Since 1982, when the room-temperature ionic liquids based on the 1-alkyl-3-methylimidazolium cation were reported to provide an attractive combination of an electrochemical solvent and electrolyte, new ionic liquids (ILs) containing a large variety of cations and anions have been synthesized with a wide range of chemically useful characteristics. In the past decade, electrochemical applications of these newly synthesized ILs have drastically increased. This chapter examines the current state of ionic liquid-based electrochemistry (voltammetry). Being composed of ions and possessing wide electrochemical windows, often in excess of 5 volts, it is not difficult to see why ILs are seen to represent potentially attractive media for use in electrochemical investigations. Initially, advantageous electrochemical properties of ILs are summarized, as are limitations encountered by the presence of impurities and difficulties related to their purification and recovery. Subsequently, the application of voltammetry, the use of IUPAC-recommended oxidation and reduction processes to provide potential reference scales and employment of adhered solid and microchemical approaches to the measurement of formal potentials and kinetics of coupled first order chemical reactions are discussed. Implications of high viscosities and a different form of double layer also are considered. Finally, an assessment is made of electrochemical application of ILs across various disciplines.
|Title of host publication||Electroanalytical Chemistry Research Trends|
|Publisher||Nova Science Publishers|
|Number of pages||63|
|Publication status||Published - 1 Dec 2008|