Investigation of cobalt deposition using the electrochemical quartz crystal microbalance

Matsushima, Jorge Tadao; Trivinho‐Strixino, Francisco; Pereira, Ernesto C.

doi:10.1016/j.electacta.2005.07.003

Cited by 88 publications

(62 citation statements)

References 30 publications

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“…A high overpotential for the reduction of Co has been documented by many groups. 4,12,14,[17][18][19]23,24,59 Upon anodic scanning, the Co is dissolved at a potential of −0.8 V, showing slightly irreversible reduction/oxidation of Co. It should also be noted that we observe no evidence for Co UPD on Au, as UPD peaks should appear at ∼−0.6 V.…”

Section: Resultsmentioning

confidence: 79%

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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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Section: Resultsmentioning

confidence: 79%

“…12 Experimental studies in sulfate and perchlorate supporting electrolyte, even in the presence of chloride, show no evidence for Co upd onto Au (111). [12][13][14]18,23 However, Co upd has been reported from 5 × 10…”

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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“…[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%

“…[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. [11][12][13][14][15][16][17][18][19][20][21] Perhaps the main advantage of using chloride plating baths rather than sulfate electrolytes is its higher electrical conductivity at lower overpotentials during Co electrodeposition.…”

Section: Introductionmentioning

confidence: 99%

“…[11][12][13][14][15][16][17][18][19][20][21] Most of these studies have been conducted from sulfate and chloride ammoniacal solutions. [11][12][13][14][15][16][17][18][19][20][21] Perhaps the main advantage of using chloride plating baths rather than sulfate electrolytes is its higher electrical conductivity at lower overpotentials during Co electrodeposition. 12 However, the stress added to the Co deposits when using chloride solutions is larger than that when using sulfate solutions.…”

Section: Introductionmentioning

confidence: 99%

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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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The Recovery of Cobalt from the Boleo Deposit Using Leach, SX and EW

Dreisinger

Glück²,

Lü

2012

Electrometallurgy 2012

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The Boleo project of Baja Mining (Vancouver) will process a mixed oxide-sulfide ore using an acid oxidation and reduction process in seawater to extract copper, zinc, cobalt and manganese. Copper will be extracted via SX-EW as copper cathode, zinc will be recovered as a zinc sulphate monohydrate crystal and cobalt will be produced as a cobalt cathode product after phosphinic acid extraction. Manganese may be recovered from the final solvent extraction raffinate by precipitation as manganese carbonate.The development of the cobalt recovery process (solvent extraction and electrowinning) will be discussed. The pilot plant solvent extraction circuit and subsequent bench and small pilot testing of cobalt electrowinning will be discussed. The Boleo project will produce approximately 1708 tonnes per annum of cobalt metal when fully commissioned.

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Investigation of cobalt deposition using the electrochemical quartz crystal microbalance

Cited by 88 publications

References 30 publications

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

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

Kinetical study about the cobalt electrodeposition onto polycrystalline platinum

The Recovery of Cobalt from the Boleo Deposit Using Leach, SX and EW

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