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

Naoki Tachikawa, Yasushi Katayama, Takashi Miura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The electrode kinetics of Fe(bpy)33+/Fe(bpy) 32+ (bpy = 2,2'-bipyridine), FeCp2 +/FFeCp2 (Cp- = cyclopentadienyl), FeCl 4-/FeCl42- and Fe(CN) 63-/Fe(CN)64- on a platinum electrode were investigated over the temperature range from 25 to 60°C in a room-temperature ionic liquid, 1-n-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide (BMFTFSI). The average activation energy for the diffusion coefficients of these complexes was ∼ 20 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) 33+/Fe(bpy)32+, FeCp 2+/FeCp2 and Fe(CN)6 3-/Fe(CN)64- were smaller than those in other conventional solvents. copyright The Electrochemical Society.

Original languageEnglish
Title of host publicationECS Transactions - 15th International Symposium on Molten Salts
Pages577-587
Number of pages11
Edition35
DOIs
Publication statusPublished - 2007 Dec 1
Event15th International Symposium on Molten Salts - 210th ECS Meeting - Cancun, Mexico
Duration: 2006 Oct 292006 Nov 3

Publication series

NameECS Transactions
Number35
Volume3
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

Other15th International Symposium on Molten Salts - 210th ECS Meeting
CountryMexico
CityCancun
Period06/10/2906/11/3

ASJC Scopus subject areas

  • Engineering(all)

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    Tachikawa, N., Katayama, Y., & Miura, T. (2007). Electrode kinetics of some iron complexes in an imide-type room-temperature ionic liquid. In ECS Transactions - 15th International Symposium on Molten Salts (35 ed., pp. 577-587). (ECS Transactions; Vol. 3, No. 35). https://doi.org/10.1149/1.2798699