3 in two imidazolium chloride ionic liquids, the 1-butyl-3-methylimidazolium (C 4mimCl) and the 1-ethyl-3-methylimidazolium (C 2mimCl), on a glassy carbon electrode]]>

摘要

AbstractThis work presents a comparative study of the electrochemical behaviour, on a glassy carbon electrode, of dissolved EuCl3in two chlorobasic ionic liquids, the 1-ethyl-3-methylimidazolium chloride, C2mimCl, and the 1-buthyl-3-methylimidazolium chloride, C4mimCl, over the temperature ranges 363–398K and 343–363K respectively. In both media, the electro-reduction of EuCl63?takes place via only one electrochemical step EuCl63?/EuCl64?. The electrochemical system EuCl64?/Eu(0) has not been observed within the electrochemical window of both ILs, due to the prior reduction of the respective imidazolium cation from the solvents, which inhibits the electro-extraction of Eu(0) from the media on the GC electrode.The paper describes how several electrochemical techniques (e.g. cyclic voltammetry (CV), convolutive potential sweep voltammetry (CPSV), steady state voltammetry (SSV), chronopotentiometry (CP) and chronoamperometry (CA)) have been used experimentally: i) verifying assumptions used in their theoretical analysis, and ii) ensuring reproducible conditions at the electrode/electrolyte interface, with the aim to obtain high-precision measurements of the diffusion coefficient of EuCl63?. In order to know if there are discrepancies between the obtained data, a two