کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6469489 | 1423973 | 2017 | 5 صفحه PDF | دانلود رایگان |
- Intramolecular water reduction of Mg(H2O)62Â +
- Electrogeneration of Mg(H2O)4(OH)2 ; ÎRG° = â 28 kJ/mol
- Gradual dehydration of Mg(H2O)4(OH)2 to Mg(OH)2
- Intramolecular dehydroxylation of Mg(OH)2 to MgO
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) (â 0.80 > EV/SCE > â 1.80).Interfacial phenomena occur at the gold resonator during cathodic polarization (â 0.90 > EV/SCE > â 1.80).MgH2O62+ââ0.90>EV/SCE>â1.25MgH2O4OH2ââ1.25>EV/SCE>â1.50MgH2O2OH2ââ1.50>EV/SCE>â1.70MgOH2From â 0.90 V, reduction of the intramolecular water of the hexa-coordinated Mg(H2O)62+ cluster enhanced the cathodic current i°MgH2O62+/i°H2O. In the range â 1.25 > EV/SCE > â 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.
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Journal: Electrochemistry Communications - Volume 84, November 2017, Pages 45-49