Electrode kinetics of some iron complexes in an imide-type room-temperature ionic liquid

Naoki Tachikawa, Yasushi Katayama, Takashi Miura

Research output: Contribution to journalArticle

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Abstract

The electrode kinetics of [Fe (bpy)3] 3+ [Fe (bpy)3] 2+ (bpy=2, 2′ -bipyridine), [Fe (Cp)2] + [Fe (Cp)2] (Cp- =cyclopentadienyl), [FeCl4] - [FeCl4] 2- and [Fe (CN)6] 3- [Fe (CN)6] 4- on a platinum electrode was investigated over the temperature range from 25 to 60°C in a room-temperature ionic liquid, 1- n -butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide (BMPTFSI). The average activation energy for the diffusion coefficients of these complexes was ∼24 kJ mol-1, which was close to the activation energy for the viscosity of BMPTFSI. The diffusion coefficients of these complexes were found to be affected not only by the viscosity of BMPTFSI but also by the charge of the complexes. On the other hand, the heterogeneous rate constants of these redox reactions were estimated to be ∼ 10-4 cm s-1 by electrochemical impedance spectroscopy. The apparent heterogeneous rate constants of [Fe (bpy)3] 3+ [Fe (bpy)3] 2+, [Fe (Cp)2] + [Fe (Cp)2], and [Fe (CN)6] 3- [Fe (CN)6] 4- were smaller than those in other conventional solvents.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume154
Issue number11
DOIs
Publication statusPublished - 2007

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Imides
Ionic Liquids
imides
Ionic liquids
Rate constants
Iron
Activation energy
Viscosity
iron
Electrodes
Kinetics
electrodes
Redox reactions
kinetics
room temperature
diffusion coefficient
liquids
Electrochemical impedance spectroscopy
viscosity
activation energy

ASJC Scopus subject areas

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Electrode kinetics of some iron complexes in an imide-type room-temperature ionic liquid. / Tachikawa, Naoki; Katayama, Yasushi; Miura, Takashi.

In: Journal of the Electrochemical Society, Vol. 154, No. 11, 2007.

Research output: Contribution to journalArticle

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