Copper electrodeposition on glassy carbon and highly oriented pyrolytic graphite substrates from perchlorate solutions

Abstract

In present work, we analyzed the copper electrodeposition onto GCE (System I) and HOPGE (System II) from perchlorate solutions. The current density transients obtained from system I and II were well described through a kinetic mechanism that involves four different contributions: (a) a Langmuir type adsorption process, b) an electron transfer from Cu2+→Cu+, (c) a 3D nucleation limited by a mass transfer reaction and (d) a proton reduction process. It was observed that the values of the nucleation rate, the number of active nucleation sites were increased with the overpotential and they are bigger onto GCE in comparison with HOPGE

Tuning the copper Cluster´s size on HOPG by electrodeposition from perchlorate aqueous solutions. An AFM study

“…3 but at t > 30 s, have already been reported previously by our research group. 19 In the transients reported in Fig. 3, note that at shorter times than 0.5 s, there is a falling current transient, which may be associated with a process where the adsorption and the step Cu 2+ to Cu 1+ occurs simultaneously at the HOPG electrode surface.…”

“…This voltammogram is similar to those reported previously by our research group. 19 Note that at the direct scan, the copper reduction process starts at 0.020 V approximately. Copper reduction process involves two-steps, the first one is a slow step, related to the reduction of Cu 2+ to Cu 1+ (peak A), while the second one is a fast step related to Cu 1+ to Cu (peak B).…”

“…Currently the main methods to synthesize them include chemical reduction, [9][10][11][12] thermal decomposition, 13 polyol, 14,15 laser ablation, 16 in situ chemical synthetic route, 17 low energy cluster beam deposition technique 18 and electrodeposition. 4,[19][20][21][22] Specifically, electrodeposition is commonly used to synthesize nanoparticles because it is a relatively simple and low cost procedure in comparison with other techniques. 22 However, it is important to highlight that the physical and chemical properties exhibited by CuN are highly dependent on their size and morphology by which, one of the main difficulty during their synthesis is tailoring and fine--tuning the cluster's size and the properties of these for a given application.…”

“…This kind of electrolyte shows advantages because ClO 4 are weakly adsorbed on the electrode surface, which allows to study the nucleation process without a strong interference of anions adsorbed on the substrate. 19 Thus, in the present work we employed the potentiostatic technique to synthesize the copper clusters with different size, maintaining constant the composition of the plating bath and modifying exclusively the applied potential on the electrode surface. We carry out the morphological characterization of the CuN employing atomic force microscopy at different applied overpotentials.…”

Phospholipids improve selectivity and sensitivity of carbon electrodes: Determination of pesticide Paraquat

“…Electrochemical behavior of copper sulphate on the surface of GCE was described in literature . Cathodic peak, labeled I, was assigned to the reduction of cupric to cuprous ions, reaction (1).…”