The role of anion additives in the electrodeposition of nickel–cobalt alloys from sulfamate electrolyte

Golodnitsky, Diana; Rosenberg, Yu.; Ulus, A.

doi:10.1016/s0013-4686(02)00135-4

Cited by 135 publications

(62 citation statements)

References 14 publications

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“…These high peaks suggest that the Ni-Co alloy deposits are considered crystalline in structure. In agreement with other research [33,37,[40][41][42], the obtained peaks indicated the deposition of a one-phase Ni-Co solid solution (α) with a face-centered cubic structure. According to the Ni-Co equilibrium phase diagram, the structure consists of the α phase, which is a substitutional solid solution of Ni and Co and the structure was face-centered cubic (fcc).…”

Section: Resultssupporting

confidence: 91%

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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Section: Resultssupporting

confidence: 91%

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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“…Micro-and nanoscale Ni Co alloy structures have been prepared by many methods, including electrochemical reduction [19,20], mechanical alloying [21], leaching techniques [22], sol gel routes [23], thermal decomposition of organometallic precursors [24], polyol reduction [25,26], and reduction of metal salts by other strong reducing agents [27,28]. Recently, several groups have reported the synthesis of one-dimensional Ni Co 304 Nano Res (2008) 1: 303 313 Nano Research nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

Magnetic field-induced solvothermal synthesis of one-dimensional assemblies of Ni-Co alloy microstructures

Lin

2008

Nano Res.

110

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One-dimensional magnetic Ni Co alloy microwires with different microstructures and differently shaped building blocks including spherical particles, multilayer stacked alloy plates, and alloy flowers, have been synthesized by an external magnetic field-assisted solvothermal reaction of mixtures of cobalt(II) chloride and nickel(II) chloride in 1, 2-propanediol with different NaOH concentrations. By adjusting the experimental parameters, such as precursor concentration and Ni/Co ratio, Ni Co alloy chains with uniform diameters in the range 500 nm to 1.3 μm and lengths ranging from several micrometers to hundreds of micrometers can be obtained. A mechanism of formation of the one-dimensional assemblies of magnetic Ni Co microparticles in a weak external magnetic fi eld is proposed.

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“…[14][15][16][17] Therefore, much effort has been made in preparation of CoNi alloys. Micro-and nanosized CoNi alloy particles were prepared by electrochemical reduction, [18][19][20] thermal decomposition of organometallic precursors, [21] sol-gel routes, [22] polyols of metal the structural information provided by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, selected-area electron diffraction and energydispersive X-ray analysis, a growth mechanism was tentatively proposed for the formation of chain- salts [23] and leaching technology. [24] Nanosized amorphous CoNi alloy powders were also obtained by sonochemical decomposition methods.…”

Section: Introductionmentioning

confidence: 99%

Surfactant‐Assisted Synthesis and Characterization of Novel Chain‐Like CoNi Alloy Assemblies

Zhu

Xiao

2007

Eur J Inorg Chem

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Novel chain-like CoNi alloy assemblies with a length of up to 6-7 µm were successfully prepared by a surfactant-assisted hydrothermal synthetic route at 100°C for 2 h. The individual submicrospheres built from smaller CoNi nanoparticles had a diameter of about 400-500 nm. These microspheres were then integrated to form the novel chain-like CoNi alloy assemblies. The effects of synthetic parameters such as surfactant and solvent on the formation and morphology of CoNi samples were investigated. The experimental results showed that N 2 H 4 ·H 2 O and CTA + play important roles in the formation of the novel chain-like CoNi alloy assemblies. Based on

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The role of anion additives in the electrodeposition of nickel–cobalt alloys from sulfamate electrolyte

Cited by 135 publications

References 14 publications

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

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

Magnetic field-induced solvothermal synthesis of one-dimensional assemblies of Ni-Co alloy microstructures

Surfactant‐Assisted Synthesis and Characterization of Novel Chain‐Like CoNi Alloy Assemblies

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