Effects of Anions on the Electrodeposition of Cobalt on Pt(111) Electrode

Kuo, Yenchung; Liao, Wen Bo; Yau, Shuehlin

doi:10.1021/la503513s

Cited by 8 publications

(3 citation statements)

References 33 publications

(75 reference statements)

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“…2D growth is often desired in many applications for depositing a pin-hole free overlayer to cover the surface of electrodes. 2D growth has been also evidenced in the cases of Co/Au(111) 19,20 and Co/Pt(111) 21 or Fe/Au(111). 22 Among noble metals, Pd grows 2D on Au(111) [23][24][25][26] and on other substrates.…”

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confidence: 87%

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Influence of Potential on the Electrodeposition of Co on Au(111) by In Situ STM and Reflectivity Measurements

Nan

Damian

Maroun

et al. 2016

J. Electrochem. Soc.

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We study the influence of the deposition potential on the electrochemical growth of Co on Au(111) in the thickness range 0–8 atomic layers (ML). In-situ STM observations evidence two growth regimes which depend on the deposition potential: at potentials <−1.2 VMSE, Co grows 2D with the initial formation of biatomic islands which rapidly cover the entire Au surface, followed by layer-by-layer growth; at potentials >−1.20 VMSE, Co grows 3D with the formation of large multilayer islands with flat top. In situ fast STM imaging of the Co dissolution process evidences a remarkable thickness dependence of the dissolution potential. Complementary electrochemical and in situ optical reflectivity characterizations of Co dissolution as a function of the Co thickness suggest that the equilibrium potential Co/Co2+ on Au is shifted by ∼−30 mV with respect to that measured on Co. This value is discussed in terms of Co-substrate binding energy.

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confidence: 87%

“…43 Co electrochemical growth on Pt(111) was also studied using in situ STM. 21,[44][45][46] These studies reported 2D growth except in the presence of strongly adsorbing anions. 41 Here we present in-situ STM observations that evidence a strong potential dependent growth mode with a transition 3D → 2D growth.…”

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confidence: 99%

Influence of Potential on the Electrodeposition of Co on Au(111) by In Situ STM and Reflectivity Measurements

Nan

Damian

Maroun

et al. 2016

J. Electrochem. Soc.

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“…Probably, it is because chloride ions induces stress on the cobalt deposited, 31 and may interact strongly with Co adatoms yielding drastic changes on the deposit morphology. 32 Nevertheless, chloride electrolytes allow to get a higher electrical conductivity in the electrolyte, lower overpotential for cobalt deposition, and higher cathodic current efficiency.…”

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confidence: 99%

Electrodeposition of Cobalt Nanoclusters From Ammonical Chloride Solutions Onto Hopg Electrodes. A Kinetical and Morphological Study

Mendoza-Huízar

Ríos-Reyes

Rivera

2017

J. Chil. Chem. Soc.

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A kinetical study about the Co electrodeposition onto Highly Oriented Pyrolytic Graphite electrodes from an aqueous solution containing 0.01 M CoCl 2 + 1 M NH 4 CI (pH = 7) was conducted at overpotential conditions through potentiostatic studies. The entire chronoamperograms were adequately predicted, considering the contribution to the total current of three different processes: a Langmuir-type adsorption process, a three-dimensional nucleation and growth and a proton reduction process. In all cases, the nucleation rate and the number of active nucleation sites are potential dependent. The Atomic Force Microscopy study revealed the presence of homogeneous cobalt clusters of less of 100 nm in height and 50 nm in diameter at different potential values.Keywords: cobalt; nanoclusters; HOPG; kinetics; AFM; MFM. INTRODUCTIONMaterials based on cobalt have attracted a considerable attention due to their magnetic properties, which can be used in the production of sensors, heterogeneous catalysts, intercalation compounds for energy storage, magnetooptic recording media, among others.1-8 Specifically, the magnetic properties of isolated cobalt particles change considerably as their sizes enter the nanometer range because they exhibit a large magnetic coercivity, which may be employed to fabricate high density magnetic memory devices.9-15 Thus, it is not so strange that different methodologies are being developed to produce magnetic cobalt nanoclusters with controlled size and morphology. [16][17][18][19][20][21] Probably, high vacuum methods, 22 and thermal decomposition 23 have been the preferred techniques to prepare monodisperse magnetic cobalt clusters onto different substrates. But, recently, electrodeposition is being recognized as an useful technique to produce cobalt nanoparticles. Also, it is important to highlight that electrodeposition is a simple electrochemical technique, which can be implemented at room temperature under ambient conditions. Moreover, these features make electrodeposition a non-expensive technique easily scalable to the industrial level. However, a good knowledge of the kinetic parameters involved during the electrodeposition process is required to achieve a precise control of the cobalt nanoclusters synthesis. In this sense, sulfate solutions have been the preferred systems to electrodeposit cobalt nanoclusters, [24][25][26][27][28][29][30] Although chloride solutions are widely employed for studying the cobalt electrochemistry, these plating baths have been scarcely used to electrodeposit cobalt nanoclusters. Probably, it is because chloride ions induces stress on the cobalt deposited, 31 and may interact strongly with Co adatoms yielding drastic changes on the deposit morphology.32 Nevertheless, chloride electrolytes allow to get a higher electrical conductivity in the electrolyte, lower overpotential for cobalt deposition, and higher cathodic current efficiency.31. These features of chloride plating baths might diminish the cost related to the synthesis of cobalt nanoclusters by ...

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Materials Characterization Using Scanning Tunneling Microscopy: From Fundamentals to Advanced Applications

Debata

Das

Madhuri

et al. 2018

Handbook of Materials Characterization

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Effects of Anions on the Electrodeposition of Cobalt on Pt(111) Electrode

Cited by 8 publications

References 33 publications

Influence of Potential on the Electrodeposition of Co on Au(111) by In Situ STM and Reflectivity Measurements

Influence of Potential on the Electrodeposition of Co on Au(111) by In Situ STM and Reflectivity Measurements

Electrodeposition of Cobalt Nanoclusters From Ammonical Chloride Solutions Onto Hopg Electrodes. A Kinetical and Morphological Study

Materials Characterization Using Scanning Tunneling Microscopy: From Fundamentals to Advanced Applications

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