Competence Center for Electrochemical Surface Technology GmbH

Wiener Neustadt, Austria

Competence Center for Electrochemical Surface Technology GmbH

Wiener Neustadt, Austria

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Whitehead A.H.,Competence Center for Electrochemical Surface Technology GmbH | Polzler M.,Competence Center for Electrochemical Surface Technology GmbH | Gollas B.,Competence Center for Electrochemical Surface Technology GmbH | Gollas B.,University of Graz
Journal of the Electrochemical Society | Year: 2010

Deep eutectic electrolytes have recently been considered as alternatives to classical room-temperature ionic liquids. This work is an initial study of the zinc deposition process from a basic choline chloride/ethylene glycol deep eutectic solvent containing ZnCl2 at 30°C. The system was examined by cyclic voltammetry at static and rotating glassy carbon disk electrodes and by potential step techniques. There was little deposition initially on sweeping or stepping the potential to -0.5 to -0.8 V vs Zn/Zn(II), but more rapid deposition was observed when the potential was subsequently raised to -0.4 to -0.2 V. The role of choline chloride was also studied by comparing with a choline-free electrolyte, which exhibited a more conventional voltammetric response. The formation of a dissolved, intermediate species Z on the cathodic sweep was proposed to account for the observed deposition behavior in the deep eutectic. Furthermore, an observation of the electrodeposition behavior with the addition of sodium ethoxide supports the suggestion that Z is a complex of Zn2+ and deprotonated components of the solvent. © 2010 The Electrochemical Society.


Vieira L.,Competence Center for Electrochemical Surface Technology GmbH | Vieira L.,University of Graz | Whitehead A.H.,Competence Center for Electrochemical Surface Technology GmbH | Gollasa B.,Competence Center for Electrochemical Surface Technology GmbH | Gollasa B.,University of Graz
Journal of the Electrochemical Society | Year: 2014

Deep eutectic electrolytes have been suggested as alternatives to classical room temperature ionic liquids and been used for the electrodeposition of metals. We have investigated the electrodeposition of zinc from a Lewis-Cbasic choline chloride/ethylene glycol deep eutectic solvent containing ZnCl 2. Raman spectroscopy confirmed the presence of the [ZnCl 4]2-C ion in the electrolyte that was examined by cyclic voltammetry at static and rotating glassy carbon disk electrodes. The formation of a dissolved, intermediate reducible zinc species Z during the cathodic sweep is proposed to account for the unusual zinc electrodeposition behavior observed in the deep eutectic electrolyte in agreement with the effect of rotation rate, cathodic switching potential and potential sweep rate on the deposition current in RDE voltammetry. The zinc electrodeposition behavior with sodium ethoxide added to the deep eutectic solvent supports the suggestion that Z is a complex of Zn2+ and deprotonated components of the solvent. The absence of a current plateau in RDE experiments with ethoxide containing electrolyte is thought to be the result of a potential dependent blocking of the reduction of Z by a layer adsorbed on the electrode. © 2013 The Electrochemical Society.


Vieira L.,Competence Center for Electrochemical Surface Technology GmbH | Whitehead A.H.,Competence Center for Electrochemical Surface Technology GmbH | Gollas B.,Competence Center for Electrochemical Surface Technology GmbH | Gollas B.,Graz University of Technology
ECS Transactions | Year: 2012

Deep eutectic electrolytes have been suggested as alternatives to classical room temperature ionic liquids and been used for the electrodeposition of metals. We have investigated the electrodeposition of zinc from a Lewis-basic choline chloride/ethylene glycol deep eutectic solvent containing ZnCl 2. The system was examined by cyclic voltammetry at static and rotating glassy carbon disc electrodes. The formation of a dissolved, intermediate species Z during the cathodic sweep is proposed to account for the observed deposition behaviour in the deep eutectic electrolyte in agreement with the effect of rotation rate on the deposition current in RDE voltammetry. The zinc electrodeposition behaviour with sodium ethoxide added to the deep eutectic solvent supports the suggestion that Z is a complex of Zn2+ and deprotonated components of the solvent. The absence of a plateau current in RDE experiments points to the potential dependent blocking of the reduction of Z by an adsorbed layer. © The Electrochemical Society.

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