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Linear sweep voltammetry coupled to a quartz crystal microbalance for investigating the catalytic activity of the Mg (II) –water electrochemical system and managing the Mg oxy-hydroxide hydration state

Betelu, Stéphanie and Rodrigues, Romain and Seron, Alain and Chauvet, Fabien and Ignatiadis, Ioannis and Tzedakis, Théo Linear sweep voltammetry coupled to a quartz crystal microbalance for investigating the catalytic activity of the Mg (II) –water electrochemical system and managing the Mg oxy-hydroxide hydration state. (2017) Electrochemistry Communications, 84. 45-49. ISSN 1388-2481

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Official URL: https://doi.org/10.1016/j.elecom.2017.09.022

Abstract

This study provides an insight into the catalytic activity of the Mg(II)–water electrochemical system, from aqueous magnesium chloride hexa-hydrate to magnesium oxy-hydroxide electro-nucleation, growth and evolution, using Linear Sweep Voltammetry (LSV) coupled to a Quartz Crystal Microbalance (QCM) (−0.80>EV/SCE>−1.80). Interfacial phenomena occur at the gold resonator during cathodic polarization (−0.90>EV/SCE>−1.80).MgH2O62+→−0.90>EV/SCE>−1.25MgH2O4OH2→−1.25>EV/SCE>−1.50MgH2O2OH2→−1.50>EV/SCE>−1.70MgOH2 From −0.90V, reduction of the intramolecular water of the hexa-coordinated Mg(H2O)62+ cluster enhanced the cathodic current i°MgH2O62+/i°H2O. In the range −1.25>EV/SCE>−1.70, electrosynthesis of Mg(H2O)4(OH)2 and its simultaneous gradual dehydration to Mg(OH)2 take place. At lower potentials, experiments suggest intramolecular dehydroxylation of Mg(OH)2 to MgO. The applied potential thus allows fine control of the hydration state of the Mg oxy-hydroxide.

Item Type:Article
HAL Id:hal-01849560
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
French research institutions > Bureau de Recherches Géologiques et Minières - BRGM (FRANCE)
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Deposited By: Loetitia MOYA
Deposited On:08 Oct 2018 12:20

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