Nucleation and growth of cobalt onto different substrates

Mendoza-Huízar, Luis Humberto; Robles, Juvencio; Palomar-Pardavé, M.

doi:10.1016/s0022-0728(02)00659-9

Cited by 125 publications

(89 citation statements)

References 24 publications

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“…A value of n c = 0 indicates that each active site on the Pt electrode surface acts as a critical nucleus, while n c = 1 indicates that the critical nucleus is formed by one Co atom. 23,24,38 These results suggest different energetic zones on the polycrystalline surface, which is coincident with previous results. 16,39 Table 2 and Eq.…”

Section: Analysis Of the Kinetic Parameterssupporting

confidence: 92%

“…[1][2][3][4][5][6][7] Most CoL have been prepared employing molecular beam sputtering, 8 evaporation techniques, 9,10 and more recently, electrodeposition. [11][12][13][14][15][16][17][18][19][20][21] Although it is well known that electrodeposition contributes to achieving reliable and inexpensive methods to produce CoL on metallic substrates, [22][23][24][25] to the best of our knowledge, few studies have considered Co electrodeposition on Pt electrodes. [11][12][13][14][15][16][17][18][19][20][21] Most of these studies have been conducted from sulfate and chloride ammoniacal solutions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Kinetical study about the cobalt electrodeposition onto polycrystalline platinum

Ríos-Reyes¹,

Mendoza-Huízar²,

Reyes-Cruz³

et al. 2013

Quím. Nova

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Recebido em 2/10/12; aceito em 25/2/13; publicado na web em 24/5/13An electrochemical study of Co electrodeposition onto polycrystalline Pt from an aqueous solution containing 10 −2 M CoCl 2 + 1 M NH 4 CI (pH = 9.3) was conducted at overpotential conditions. The current density transients showed two maxima that corresponded to two nucleation and growth processes. The entire transient behavior was adequately predicted considering the contribution to the total current of four different processes: a Langmuir-type adsorption process, a diffusion-controlled twodimensional instantaneous nucleation, and two three-dimensional nucleation and growth processes.

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Section: Analysis Of the Kinetic Parameterssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Kinetical study about the cobalt electrodeposition onto polycrystalline platinum

Ríos-Reyes¹,

Mendoza-Huízar²,

Reyes-Cruz³

et al. 2013

Quím. Nova

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“…[4][5][6][7][8][9][10][11] These properties are largely dependent upon the structure and morphology of the electrodeposit, which in the case of cobalt can vary dramatically with overpotential, electrolyte pH, and the presence of strongly adsorbing anions. 2,[12][13][14][15][16] …”

mentioning

confidence: 99%

In Situ Stress Measurements during Cobalt Electrodeposition on (111)-Textured Au

Fayette

Bertocci

Stafford

2016

J. Electrochem. Soc.

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Cantilever curvature was used to examine stress generation during the electrodeposition of Co onto (111)-textured Au from 0.1 mol/L NaClO 4 + 0.001 mol/L Co(ClO 4 ) 2 (pH = 4.8) in films measuring less than 25 nm in thickness and at Co current efficiencies ranging from 65% to 90%. XRD analysis indicates that the Co is face-centered cubic and maintains the (111) texture of the Au substrate, suggesting epitaxial but not pseudomorphic growth on the Au. The stress-thickness product showed a −0.2 N/m compression in the first monolayer followed by increasing tensile stress as the film thickened. The initial compressive stress is most likely due to surface and interface stresses that dominate at submonolayer coverage. Steady state tensile stress, ranging from 0 to +450 MPa, developed in continuous Co films and showed a strong dependence on electrode potential. However, over this potential range there is no change in grain size or growth rate, factors typically associated with tensile stress. We attribute the tensile stress and its potential dependence to the formation of hydrogen stabilized vacancies, defects found to be quite stable in fcc Fe-group metals and alloys deposited under conditions of H + discharge. The use of electrodeposited Co-based materials has attracted much attention over the past several decades owing in part to their interesting magnetic 1-3 and catalytic properties. [4][5][6][7][8][9][10][11] These properties are largely dependent upon the structure and morphology of the electrodeposit, which in the case of cobalt can vary dramatically with overpotential, electrolyte pH, and the presence of strongly adsorbing anions. 2,[12][13][14][15][16]

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“…Thus, the application of this potential guarantees that the electrochemical signals recorded during the cathodic polarization are caused by the cobalt electroreduction on the electrode. 20 The potential step was imposed at different potentials detailed in this work. Microstructures of electrodeposits were examined by using atomic force microscopy (AFM), the images were obtained with a Jeol JSPM 4210 microscope.…”

Section: Methodsmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Mendoza-Huízar¹,

Ríos-Reyes²,

Rivera³

2010

Quím. Nova

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It was carried out an electrochemical study of the cobalt electrodeposition onto HOPG electrode from an aqueous solution containing 10 -2 M of CoSO 4 + 1M (NH 4 ) 2 SO 4 . Nucleation parameters such as nucleation rate, density of active nucleation sites, saturation nucleus and the rate constant of the proton reduction reaction (k PR ) were determined from potentiostatic studies. An increase in k PR values with the decrease in the applied potential suggested a competition between H + and Co 2+ by the active sites on the surface. The ∆G energy calculated for the formation of stable nucleus was 8.21x10-21 J/nuclei. The AFM study indicated the formation of small clusters of 50-400 nm in diameter and 2-120 nm in height.

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Nucleation and growth of cobalt onto different substrates

Cited by 125 publications

References 24 publications

Kinetical study about the cobalt electrodeposition onto polycrystalline platinum

Kinetical study about the cobalt electrodeposition onto polycrystalline platinum

In Situ Stress Measurements during Cobalt Electrodeposition on (111)-Textured Au

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

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