Nonadditivity of faradaic currents and modification of double layer capacitance in the voltammetry of mixtures of ferrocene and ferrocenium salts in ionic liquids

Muhammad Shiddiky, Angel Torriero, Juan Reyna-Gonzalez, Alan Bond

Research output: Contribution to journalArticleResearchpeer-review

31 Citations (Scopus)

Abstract

Electrochemical studies on the Fc + e(-) reversible arrow Fc(+) (Fc = ferrocene) process have been undertaken via the oxidation of Fc and reduction of Fc. as the hexafluorophosphate (Pr-6(-)) or tetrafluoroborate (BF4-) salts and their mixtures in three ionic liquids (ILs) (1-butyl-methylpyrrolidinium bis[(trifluoromethyl)sulfonyl]imide, 1-butyl-3-methylimidazolium tetrafluoroborate, and 1-butyl-3-methylimidazolium hexafluorophosphate). Data obtained at macro- and microdisk electrodes using conventional dc and Fourier-transformed large-amplitude ac (FT-ac) voltammetry reveal that diffusion coefficients for Fc and Fc(+) differ significantly and are a function of the Fc and Fc(+) concentration, in contrast to findings in molecular solvents with 0.1 M added supporting electrolyte media.
Original languageEnglish
Pages (from-to)1680 - 1691
Number of pages12
JournalAnalytical Chemistry
Volume82
Issue number5
DOIs
Publication statusPublished - 2010

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