Paper
Electrode Reaction and Mass-Transport Mechanisms Associated with the Iodide/Triiodide Couple in the Ionic Liquid 1-Ethyl-3-methylimidazolium Bis(trifluoromethanesulfonyl)imide
Published Sep 23, 2014 · Cameron L. Bentley, A. Bond, A. Hollenkamp
Journal of Physical Chemistry C
31
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Abstract
The oxidation and reduction processes associated with the iodide/triiodide (I–/I3–) couple have been investigated in the room temperature ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide using cyclic voltammetry, convolution voltammetry, and chronoamperometry. Analogous to the case in acetonitrile, two processes with a relative electron stoichiometry of 2:1 are observed at a platinum electrode and are assigned to the I–/I3– and I3–/I2 processes at lower and higher potentials, respectively. The electro-oxidation of I– has been simulated using a termolecular charge transfer mechanism: I2 + 2e– ⇌ I– + I– (E°, ks, α), I2 + I– ⇌ I3– (Keq, kf), where E°, ks, α, Keq, and kf are the standard potential, standard heterogeneous electron-transfer rate constant, charge transfer coefficient, equilibrium (stability) constant, and bimolecular (forward) rate constant, respectively. The stability constant of I3– in this ionic liquid (Keq = 2.3 × 106, estimated by simulation) is comparable to that...
The iodide/triiodide couple in the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide exhibits two processes with a 2:1 electron stoichiometry, suggesting potential applications in
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