Ferrocene as a Reference Redox Couple for Aprotic Ionic Liquids | Zendy

Lewandowski Andrzej | Zendy; Waligora Lukasz | Zendy; Galinski Maciej | Zendy

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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 .

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