Temperature effects on the kinetics of ferrocene and cobaltocenium in methyltriphenylphosphonium bromide based deep eutectic solvents

L. Bahadori, M. H. Chakrabarti, M. A. Hashim, N. S A Manan, F. S. Mjalli, I. M. AlNashef, N. P. Brandon

Research output: Contribution to journalArticle

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Abstract

The oxidation of ferrocene (Fc/Fc+) and reduction of cobaltocenium (Cc+/Cc) under different temperatures has been studied by cyclic voltammetry and double potential step chronoamperometry in deep eutectic solvents (DESs) consisting of methyltriphenylphosphonium bromide salt with tri-ethylene glycol, glycerol or ethylene glycol as hydrogen bond donors. The temperature dependence of the measured physical properties of DESs (such as viscosity and conductivity) is discussed in detail. The kinetics of the redox couples are studied using cyclic voltammetry, and the standard heterogeneous electron transfer rate constant, κ0 is found to be of the order of 10-5 to 10-4 cms-1 at different temperatures. The diffusion coefficient, D, of Fc and Cc+ is determined to lie between 8.28 × 10-10 to 6.65 × 10-9 cm2 s-1. These results show that both κ0 and D increase with temperature in the studied DESs. In addition, better kinetic parameters for the DES with ethylene glycol as hydrogen bond donor means that this could be evaluated favorably as both solvents and electrolytes for redox flow cells.

Original languageEnglish
Pages (from-to)H617-H624
JournalJournal of the Electrochemical Society
Volume162
Issue number9
DOIs
Publication statusPublished - Jun 18 2015

Fingerprint

Bromides
eutectics
Thermal effects
Eutectics
temperature effects
bromides
Ethylene Glycol
Ethylene glycol
Kinetics
kinetics
glycols
ethylene
Cyclic voltammetry
Hydrogen bonds
hydrogen bonds
Temperature
Chronoamperometry
glycerols
Glycerol
Kinetic parameters

ASJC Scopus subject areas

  • Electrochemistry
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics

Cite this

Temperature effects on the kinetics of ferrocene and cobaltocenium in methyltriphenylphosphonium bromide based deep eutectic solvents. / Bahadori, L.; Chakrabarti, M. H.; Hashim, M. A.; Manan, N. S A; Mjalli, F. S.; AlNashef, I. M.; Brandon, N. P.

In: Journal of the Electrochemical Society, Vol. 162, No. 9, 18.06.2015, p. H617-H624.

Research output: Contribution to journalArticle

Bahadori, L. ; Chakrabarti, M. H. ; Hashim, M. A. ; Manan, N. S A ; Mjalli, F. S. ; AlNashef, I. M. ; Brandon, N. P. / Temperature effects on the kinetics of ferrocene and cobaltocenium in methyltriphenylphosphonium bromide based deep eutectic solvents. In: Journal of the Electrochemical Society. 2015 ; Vol. 162, No. 9. pp. H617-H624.
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