Microstructure and mechanical properties of disperse Ni–Co alloys electrodeposited on Cu substrates

Rafailović, Lidija D.; Karnthaler, H. P.; Trišović, Tomislav; Minić, Duško

doi:10.1016/j.matchemphys.2009.11.029

Cited by 32 publications

(18 citation statements)

References 23 publications

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“…As can be clearly seen from Table 1, as the Co ion concentration within the electrolyte increases from 0.03 to 0.05 M, the Co content within the films increases from ∼39 to 65 at.%. These results are in good agreement with the studies performed by different researchers [2,10,18,19]. It is also observed that the chemical composition of the films is different from that within the electrolyte composition.…”

Section: Resultssupporting

confidence: 92%

“…The values of the Co ion percentages within the electrolytes are found to be smaller than that of the Co percentages within the films for all conditions, which implies that the anomalous codeposition behavior occurs irrespective of electrolyte concentration under these experimental conditions. It is well known that the deposition of a less noble metal, i.e., Co, is more favored compared to that of a more noble metal, i.e., Ni, within the electrolyte solutions containing Ni and Co ions [19]. XRD patterns of the electrodeposited Ni-Co thin films prepared from the electrolytes with low and high Co ion concentrations are given in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Differences Observed in the Phase Structure, Grain Size–Shape, and Coercivity Field of Electrochemically Deposited Ni–Co Thin Films with Different Co Contents

Saraç

Baykul

Uguz

2015

J Supercond Nov Magn

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Nanostructured Ni-Co thin films were produced using galvanostatic electrodeposition on indium tin oxide (ITO)-coated glass substrates from an aqueous electrolyte solution without stirring at ambient temperature. Different compositions of the films were achieved depending on the Co ion concentration within the electrolyte. From the compositional analysis performed using energy dispersive X-ray (EDX) spectroscopy, the anomalous codeposition was found for all films and an increase in the Co content of the films was observed with increasing Co ion concentration within the electrolyte. The X-ray diffraction (XRD) analyses revealed that the phase structure of the electrodeposited Ni-Co thin films changes from single face-centered cubic (FCC) to a mixture of FCC and hexagonal closepacked (HCP) with the Co content within the films. It was also observed that the mean crystallite size estimated by applying the Scherrer method gradually decreases as the Co content within the films increases. The scanning electron microscopy (SEM) employed for the surface morphology showed that the size and shape of the grains formed on the film surface are strongly dependent on Co content within the films. Magnetic measurements performed by vibrating sample magnetometer (VSM) revealed that the films with different Co contents exhibit different magnetic properties;

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Differences Observed in the Phase Structure, Grain Size–Shape, and Coercivity Field of Electrochemically Deposited Ni–Co Thin Films with Different Co Contents

Saraç

Baykul

Uguz

2015

J Supercond Nov Magn

View full text Add to dashboard Cite

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“…Electrodeposition of Ni and Co ions is an anomalous type that the less noble metal (cobalt) deposits preferentially and the Co ratio Co/(Ni + Co) in the deposits is higher than that of the solution [14,16,18,21,32]. Nevertheless, reports on influences of suspended particles on the anomalous electrodeposition of Ni and Co are scarce.…”

Section: Introductionmentioning

confidence: 99%

The kinetics of Ni–Co/SiC composite coatings electrodeposition

Bahadormanesh

Dolati

2010

Journal of Alloys and Compounds

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“…According to Rafailović et al [39], an increase in the current density leads to an increase in the overpotential which is combined by an increase in the activation of the electrode reaction. This leads to a higher nickel content in the Ni-Co deposits.…”

Section: Resultsmentioning

confidence: 99%

“…A higher overpotential is needed for a higher current density. An increase in the overpotential leads to an increase in the nucleation rate and hence a reduction in the crystalline size [39,45]. Figure 7 displays the polarization of the steel substrate and the deposited nanocrystalline Ni-Co alloys at different current densities and times.…”

Section: Resultsmentioning

confidence: 99%

Morphology and Electrochemical Characterization of Electrodeposited Nanocrystalline Ni-Co Electrodes for Methanol Fuel Cells

Abdel-Karim

Ramadan

El‐Raghy

2018

Journal of Nanomaterials

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An electrocatalytic electrode surface was developed for alcoholic fuel cell by electrodeposition of Ni-Co alloy on a 301 stainless steel substrate. Material characterization by EDX and XRD confirmed deposition of Ni-Co alloy on stainless steel surfaces with a cobalt content of 15-35%. SEM showed nodular and/or angular particles with some subparticles embedded within the coarse nodules. Increasing the deposition current density as well as deposition time leads to deposition of Ni-Co alloys characterized by coarse angular morphology with lower cobalt content. The electrocatalytic activity of the coated electrodes was characterized by potentiodynamic polarization test, electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV) tests in anodic solution for electrochemical oxidation of methanol. Polarization study showed very much higher current density for the coated electrode compared to bare stainless steel. According to the EIS test in 1 M methyl alcohol acidic solution, it was found that polarization resistance of the coated sample was much lower compared to the bare substrate. The electrical equivalent circuit at the metal solution interface was found to be matching Randle with Warburg resistance. The results of the CV test showed higher peaks for alcohol oxidation and oxygen reduction compared to the bare substrate. The alloy coating with increased effective surface area leads to enhancement in the electrocatalytic activity of the electrodes. The alloys deposited at current densities of 50 and 80 mA/cm 2 for 30 minutes (15-16% Co) had higher catalytic activity of the Ni-Co nanocrystalline deposits for methanol oxidation for direct methanol fuel cells, than those under other deposition conditions.

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Microstructure and mechanical properties of disperse Ni–Co alloys electrodeposited on Cu substrates

Cited by 32 publications

References 23 publications

Differences Observed in the Phase Structure, Grain Size–Shape, and Coercivity Field of Electrochemically Deposited Ni–Co Thin Films with Different Co Contents

Differences Observed in the Phase Structure, Grain Size–Shape, and Coercivity Field of Electrochemically Deposited Ni–Co Thin Films with Different Co Contents

The kinetics of Ni–Co/SiC composite coatings electrodeposition

Morphology and Electrochemical Characterization of Electrodeposited Nanocrystalline Ni-Co Electrodes for Methanol Fuel Cells

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