Electrochemical kinetic study about cobalt electrodeposition onto GCE and HOPG substrates from sulfate sodium solutions

Cobalt electrodeposition onto highly oriented pyrolytic graphite (HOPG) electrode from ammonium sulfate solutions

“…31,32 The ∆G value obtained is lower than the values calculated for the electrocrystallization of Ni on carbon microelectrodes, 34 Cu on copper 35 and Co on carbon electrodes from sodium sulfate solutions. 12 Through the physical constants reported ( The results obtained for N s , are summarized on Table 2. Observe that the N s values increased with the applied potential.…”

“…Most of the Co electrodeposition studies have been performed onto carbon electrodes [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] and some others onto stainless steel, 18,19 gold, [20][21][22] nickel, 23 copper 24 and platinum 25 electrodes. Probably, carbon electrodes are the preferred substrates because they offer an inert surface in where it is possible to study the nucleation and growth process neglecting the metal-metal interaction.…”

“…However, Co electrodeposition onto highly oriented pyrolytic graphite (HOPG) surfaces has been scarcely investigated. [12][13][14][15] Recently, it has been analyzed the initial stages of the Co electrodeposition process onto HOPG electrodes from sodium and ammonium sulfate solutions employing atomic force microscopy. 15 In such work, it was investigated the cationic influence on the nucleation process of Co nano-size aggregates.…”

In-situ magnetization measurements and ex-situ morphological analysis of electrodeposited cobalt onto chemical vapor deposition graphene/SiO2/Si

“…Most studies about cobalt electrodeposition have been performed on a variety of substrates, such as carbon-based materials [1][2][3][4], gold [5,6], nickel [7], copper [8] and platinum [9], as working electrodes (WE). Carbonbased substrates have frequently been used as electrodes because they are inert surfaces that result in low hydrogen formation at high negative potential [10].…”

“…Cobalt electrodeposition on highly oriented pyrolytic graphite (HOPG) [1,4] and glassy carbon [2,11] substrates has been studied. Specifically, Grujicic and Pesic [2] published a study on cobalt nucleation mechanisms on a glassy carbon electrode starting from different ammonium sulphate aqueous solutions and using different techniques, such as cyclic voltammetry and chronoamperometry.…”