Abstract
The mechanism of over-potential deposition of copper on commercial and lab-made gold micro- and nanoelectrodes has been experimentally analysed and compared to the available theoretical descriptions and experimental data. For a larger commercial microelectrode, the measured chronoamperometric transients exhibited a transitional behaviour between the response typical of large Au(111) electrode and the responses recorded for lab-made gold nanoelectrodes. The latter deviated from the theoretical mechanism of Correia, apart from the limiting parts of transients, which showed a partial agreement with the theory. The observed deviations indicate that the role of such parameters as electrode surface area, size, shape and morphology (e.g. defects) is crucial in metal nucleation mechanism at micro- and possibly nano-sized electrodes.
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