Voltammetric response of water in deep eutectic solvent based on choline chloride and urea
Bučko, M. and Roy, S. and Valverde-Armas, P. and Onjia, A. and Bastos, A. C. and Bajat, J. B. (2018) Voltammetric response of water in deep eutectic solvent based on choline chloride and urea. Journal of the Electrochemical Society, 165 (16). H1059-H1065. ISSN 0013-4651 (https://doi.org/10.1149/2.0921816jes)
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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.
ORCID iDs
Bučko, M., Roy, S. ORCID: https://orcid.org/0000-0002-3399-035X, Valverde-Armas, P. ORCID: https://orcid.org/0000-0002-7211-1127, Onjia, A., Bastos, A. C. and Bajat, J. B.;-
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Item type: Article ID code: 66524 Dates: DateEvent20 December 2018Published13 December 2018Accepted26 November 2017SubmittedSubjects: Technology > Chemical engineering Department: Faculty of Engineering > Chemical and Process Engineering Depositing user: Pure Administrator Date deposited: 10 Jan 2019 12:55 Last modified: 31 Oct 2024 01:44 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/66524