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Article Dans Une Revue ChemElectroChem Année : 2021

Charge Transfer Kinetics at Ag(111) Single Crystal Electrode/Ionic Liquid Interfaces: Dependence on the Cation Alkyl Side Chain Length

M. Li
  • Fonction : Auteur
S. Liu
  • Fonction : Auteur
L. Xie
  • Fonction : Auteur
J. Yan
  • Fonction : Auteur correspondant
Corinne Lagrost
B. Mao
  • Fonction : Auteur correspondant

Résumé

The influences of the electrode/ionic liquids interfaces on the charge transfer kinetics are addressed with the example of the oxidation of chromocene at a single crystal Ag(111) electrode. We considered three different imidazolium-based room temperature ionic liquids (RTILs) with alkyl chains of different lengths but with a common anion. The standard charge transfer rate constants k° are extracted from cyclic voltammograms (CVs) by analyzing the peak potential variations with the scan rate and/or performing semi-integral electroanalysis with a careful treatment of the ohmic drop. Linear variations between the logarithms of k° and the longitudinal relaxation times τL or the dynamic viscosity η of the ionic liquids are obtained. However, the amplitude of the decrease is much larger than it could be expected from the sole bulk properties of the ionic liquid indicating a strong effect of the interface on the kinetics. These observations agree with a well-organized electrode/RTIL interface that behaves as a sort of self-assembled monolayer that controls the charge transfer kinetics with an exponential tunneling coefficient β of 5.51 nm−1.
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Dates et versions

hal-03196124 , version 1 (16-04-2021)

Identifiants

Citer

M. Li, S. Liu, L. Xie, J. Yan, Corinne Lagrost, et al.. Charge Transfer Kinetics at Ag(111) Single Crystal Electrode/Ionic Liquid Interfaces: Dependence on the Cation Alkyl Side Chain Length. ChemElectroChem, 2021, 8 (5), pp.983-990. ⟨10.1002/celc.202100094⟩. ⟨hal-03196124⟩
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