Voltammetric response of water in deep eutectic solvent based on choline chloride and urea

M. Bučko, S. Roy, P. Valverde-Armas, A. Onjia, A. C. Bastos, J. B. Bajat

Research output: Contribution to journalArticle

Abstract

This work investigates the electrochemical role of water in the research of deep eutectic solvent (DES) based on urea and choline chloride. The motivation comes from the growing use of this DES, and on reports where a characteristic voltammetric cathodic pre-wave is observed. However, there has been no direct study to verify if such interpretation of the pre-wave is appropriate. In this regard, cyclic voltammetry has been used in this paper to interrogate the reactions inducing the appearance of the pre-wave. These experiments have been carried out using reline (the eutectic mixture of urea and choline chloride) melts containing different amounts of water, compounds which can be incorporated as impurities from air, or as decomposition products of reline. The analyses showed that a pre-wave in voltammograms in reline originates from water electroreduction accompanied with a subsequent choline hydroxide formation. In this sense, reline behaves like a typical mixture of organic solvent + alkali cation salt + water. The voltammetric signal depends on water content in reline. Importantly, this offers a possibility for in-situ electrochemical determination of water content in reline, provided that a calibration curve is constructed.
LanguageEnglish
PagesH1059-H1065
Number of pages7
JournalJournal of the Electrochemical Society
Volume165
Issue number16
DOIs
Publication statusPublished - 20 Dec 2018

Fingerprint

choline
Choline
ureas
Urea
eutectics
Eutectics
chlorides
Water
Water content
water
moisture content
Saline water
Alkalies
Organic solvents
Cyclic voltammetry
hydroxides
Cations
alkalies
Positive ions
Calibration

Keywords

  • electrochemical engineering
  • deep eutectic solvent
  • voltammetric signal

Cite this

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title = "Voltammetric response of water in deep eutectic solvent based on choline chloride and urea",
abstract = "This work investigates the electrochemical role of water in the research of deep eutectic solvent (DES) based on urea and choline chloride. The motivation comes from the growing use of this DES, and on reports where a characteristic voltammetric cathodic pre-wave is observed. However, there has been no direct study to verify if such interpretation of the pre-wave is appropriate. In this regard, cyclic voltammetry has been used in this paper to interrogate the reactions inducing the appearance of the pre-wave. These experiments have been carried out using reline (the eutectic mixture of urea and choline chloride) melts containing different amounts of water, compounds which can be incorporated as impurities from air, or as decomposition products of reline. The analyses showed that a pre-wave in voltammograms in reline originates from water electroreduction accompanied with a subsequent choline hydroxide formation. In this sense, reline behaves like a typical mixture of organic solvent + alkali cation salt + water. The voltammetric signal depends on water content in reline. Importantly, this offers a possibility for in-situ electrochemical determination of water content in reline, provided that a calibration curve is constructed.",
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Voltammetric response of water in deep eutectic solvent based on choline chloride and urea. / Bučko, M.; Roy, S.; Valverde-Armas, P.; Onjia, A.; Bastos, A. C.; Bajat, J. B.

In: Journal of the Electrochemical Society, Vol. 165, No. 16, 20.12.2018, p. H1059-H1065.

Research output: Contribution to journalArticle

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