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Voltammetric and spectroscopic study of ferrocene and hexacyanoferrate and the suitability of their redox couples as internal standards in ionic liquids

Abstract

Ionic liquids and deep eutectic solvents have great potential in metallurgical applications as specialised solvents. In order to design ionometallurgical electrowinning and electrorefining processes, it is essential to characterise electrochemical behaviour of metal complexes and compare potentials between relevant solvents. For such investigations, a universal reference redox couple would be desirable. In this study we investigate the speciation and electrochemical behaviour of ferrocene/ferrocenium and hexacyanoferrate(III/II) as possible reference couples for 15 different ionic media on platinum (Pt), glassy carbon (GC) and gold (Au) working electrodes. Amongst other parameters, formal electrode potentials, charge transfer coefficients, and rate constants were calculated. It was found that neither ferrocene nor hexacyanoferrate are universally suitable as redox standards in the liquids investigated. However, hexacyanoferrate exhibits clear advantages in most of the strongly coordinating ionic liquids studied here.

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Publication details

The article was received on 11 Aug 2017, accepted on 05 Sep 2017 and first published on 13 Sep 2017


Article type: Paper
DOI: 10.1039/C7CP05483A
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Voltammetric and spectroscopic study of ferrocene and hexacyanoferrate and the suitability of their redox couples as internal standards in ionic liquids

    N. Frenzel, J. Hartley and G. Frisch, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP05483A

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