Cyclic voltammetry room-temperature ionic liquids

Oliveri et al. (2009) presented the development of an artificial tongue based on cyclic voltammetry at Pt microdisk electrodes for the classification of olive oils according to their geographical origin the measurements are made directly in the oil samples, previously mixed with a proper quantity of a RTIL (room temperature ionic liquid). The pattern recognition techniques applied were PCA for data exploration and fc-NN for classification, validating the results by means of a cross-validation procedure with five cancellation groups. 

D. Hardacre, C. Seddon, K. R. Compton, R. G. Voltammetry of oxygen in the room-temperature ionic liquids l-ethyl-3-methylimida-zolium bis(triflyl)imide and HexEt3N+ TfiN one-electron reduction to form superoxide. Steady-state and transient behavior in the same cyclic voltammogram resulting from widely different diffusion coefficients of oxygen and superoxide. J. Phys. Chem. A 2003,... 

Occasionally also the use of so-caUed pseudo reference electrodes has been reported (see Chap. 14). Such pseudo reference electrodes became popular in polarography but especially in cyclic voltammetry, employing three electrode arrangements. They consist of a silver or platinum wire or activated carlxMi dipping into the electrolyte. They substitute for a reference electrode. Such electrodes were reported to exhibit very stable potentials. The ease of such an arrangement was also used in electrochemical studies in (room temperature) ionic liquids. It must be pointed out that electrode potentials versus such electrodes are meaningless as such arrangements do not constitute thermodynamic values. 

Cyclic voltammetry of nickel(II) salen was carried out at a glassy carbon electrode in [BMIM][BF4]. Nickel(II) salen exhibited one-electron, quasi-reversible reduction to nickel(I) salen, and the latter species served as a catalyst for cleavage of carbon-halogen bonds in iodoethane and 1,1,2-trichlorotrifluoroethane (Freon 113) [9]. It is notable that the diffusion coefficient for nickel(II) salen in the ionic liquid at room temperature is more than 500 times... 

Since the electron donating feature of an oxygen atom in a methoxyethyl group weakens the cation s positive charge, the electrostatic binding between the ammonium cation and anion weakens, and an ionic liquid forms. The limiting reduction and oxidation potentials (Ered and Eoxd) on platinum of the ionic liquids were measured by cyclic voltammetry at room temperature as shown in Fig. 3. 

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