Abstract
Magnesium underpotential deposition on gold electrodes from magnesium nitrate –ammonium nitrate melts has been investigated. Linear sweep voltammetry and potential step were used as electrochemical techniques. Scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and X-ray diffraction (XRD) were used for characterization of obtained electrode surfaces. It was observed that reduction processes of nitrate, nitrite and traces of water (when present), in the Mg underpotential range studied, proceeded simultaneously with magnesium underpotential deposition. There was no clear evidence of Mg/Au alloy formation induced by Mg UPD from the melt made from eutectic mixture [Mg(NO3)2·6H2O + NH4NO3·XH2O]. However, EDS and XRD analysis showed magnesium present in the gold substrate and four different Mg/Au alloys being formed as a result of magnesium underpotential deposition and interdiffusion between Mg deposit and Au substrate from the melt made of a nonaqueous [Mg(NO3)2 + NH4NO3] eutectic mixture at 460 K.
Highlights
For some time gold (Au) has roused interest in the field of solid state chemistry, materials science, optics, and organic light emitting diodes
Potentiodynamic polarization curves and cyclic voltammetry measurements performed on gold working electrode with magnesium reference and counter electrodes have shown that magnesium reversible potential in the used magnesium nitrate melts was stable
Magnesium was successfully electrodeposited onto a gold electrode from a nonaqueous magnesium/ammonium eutectic mixture, at potentials positive to 0.100 V and temperatures between
Summary
Gold (Au) has roused interest in the field of solid state chemistry, materials science, optics, and organic light emitting diodes. In the semiconductor industry, owing to its high thermal and electrical conductivities, good oxidation resistance, and good workability, gold is a popular material for wiring. In the effort to improve the bonding and strength of thinner wires, cost reduction is one of the many challenges [1,2]. There are gold-based catalysts, which, due to large-sized gold clusters made of closely packed gold atoms, represent a bridge between atomic state and bulk material. These have been developed [3,4] and increasingly used in many industries [5,6,7]. These gold-based metal catalyst are very active at low temperatures and are almost certainly more active than any other equivalent noble metal catalyst [5]
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