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Ferrocene as a Reference Redox Couple for Aprotic Ionic Liquids
Author(s) -
Lewandowski Andrzej,
Waligora Lukasz,
Galinski Maciej
Publication year - 2009
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200904669
Subject(s) - ferrocene , ionic liquid , acetonitrile , electrochemistry , chemistry , ohmic contact , redox , diffusion , analytical chemistry (journal) , inorganic chemistry , electrode , anode , thermodynamics , organic chemistry , physics , catalysis
The electrochemical behavior of ferrocene has been studied in a number of room temperature ionic liquids. Diffusion‐controlled, well‐defined anodic and cathodic peaks were found for the Fc/Fc + (ferrocene/ferrocenium) oxidation/reduction on the gold electrode. Ohmic resistance R between working and auxiliary electrodes was deduced from impedance measurements. Cyclic voltammograms were corrected for the base line current as well as for the ohmic drop ( IR ). The formal potential 1/2( E pa + E pc ) for ferrocene reduction/oxidation in aprotic ionic liquids tested is within a relatively narrow range and may be approximated by the value of 0.527±0.018 V (against the cryptate Ag/Ag + 222 in acetonitrile reference). Ferrocene diffusion coefficients, calculated from the peak current dependence on the sweep rate, were of the order of 10 −7 cm 2 s −1 .