Morphological and magnetic properties of cobalt nanoclusters electrodeposited onto HOPG

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

“…This result may be due to the occupation of active sites by (NH 4 ) + ions adsorbed on the surface. 15 In the framework of the atomistic theory of electrolytic nucleation, it is possible to estimate the critical size of the Co nucleus (n c ) from the potential dependence of A through the following equation: 36 (13) where α Co is the transfer coefficient for Co reduction. The plots ln A vs η showed a linear tendency ( Figure 1S, supplementary material).…”

“…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.…”

“…[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. From the electrochemical results, it was observed that the kind of ion in solution influences the cluster formation energy as well as the growth rate as a function of the reduction potential.…”

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].…”