The effect of cathodic current density on the microstructure of electrochemically produced nanostructured powders of NixMo1–x alloys

Ribić-Zelenović, Lenka; Spasojević, M.; Maricic, A.

doi:10.1016/j.matchemphys.2008.12.022

Cited by 15 publications

(14 citation statements)

References 22 publications

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“…Table indicates that when the current density increases, the average size of Cu 2 O crystallite declines. According to Çetinel and Ribic-Zelenovic et al, the increase in lattice strain and nucleation sites causes the decrease in the size of the crystallite. They pointed out that the increase in the current/voltage reduces the crucial radius of the nucleus and the number of atoms that make up the nucleus, leading to faster nucleation and the creation of smaller crystals. , …”

Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of Electrochemically Deposited Cu₂O/ZnO Heterojunctions on Porous Silicon

Çetinel

Utlu

2023

ACS Omega

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Cu2O/ZnO heterojunction was fabricated on porous silicon (PSi) by a two-step electrochemical deposition technique with changing current densities and deposition times, and then the PSi/Cu2O/ZnO nanostructure was systematically investigated. SEM investigation revealed that the morphologies of the ZnO nanostructures were significantly affected by the applied current density but not those of Cu2O nanostructures. It was observed that with the increase of current density from 0.1 to 0.9 mA/cm2, ZnO nanoparticles showed more intense deposition on the surface. In addition, when the deposition time increased from 10 to 80 min, at a constant current density, an intense ZnO accumulation occured on Cu2O structures. XRD analysis showed that both the polycrystallinity and the preferential orientation of ZnO nanostructures change with the deposition time. XRD analysis also revealed that Cu2O nanostructures are mostly in the polycrystalline structure. Several strong Cu2O peaks were observed for less deposition times, but those peaks diminish with increasing deposition time due to ZnO contents. According to XPS analysis, extending the deposition time from 10 to 80 min, the intensity of the Zn peaks increases, whereas the intensity of the Cu peaks decreases, which is verified by the XRD and SEM investigations. It was found from the I–V analysis that the PSi/Cu2O/ZnO samples exhibited rectifying junction and acted as a characteristical p-n heterojunction. Among the chosen experimental parameters, PSi/Cu2O/ZnO samples obtained at 0.5 mA current density and 80 min deposition times have the best junction quality and defect density.

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Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of Electrochemically Deposited Cu₂O/ZnO Heterojunctions on Porous Silicon

Çetinel

Utlu

2023

ACS Omega

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“…High quality alloys of these metals can be obtained by electrolytic deposition from environmentally friendly ammonium citrate baths. Through adjustment of the kinetic and operational parameters of electrolysis, Ni-Fe-W alloys having specific physicochemical properties can be generated [12,14,19,22,[26][27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Morphological, microstructural and magnetic characteristics of electrodeposited Ni-Fe-W-Cu alloy powders

et al. 2020

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Nanostructured Ni-FeW -Cu alloy powders were electrodeposited from an alkaline ammonium citrate solution on a titanium cathode. Powder particles were dendrite-and cauliflower-shaped. The dendritic particles had a high density of branches made up of interconnected globules. XRD analysis showed that the powder contained an amorphous matrix and FCC nanocrystals of the solid solution of Fe, W and Cu in Ni. As the deposition current density increased, the mean nanocrystal size decreased, and the mean value of internal microstrain and the total weight percent of Fe and Ni in the alloy increased. The powders deposited at higher current densities exhibited higher magnetization. During annealing at temperatures up to 460 °C, the powders underwent short-range ordering, which caused an increase in magnetization, whereas at temperatures above 460 °C, the magnetization decreased due to the formation of large FCC crystalline grains.

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“…Electrochemical methods result in alloys which differ in chemical composition, morphology, microstructure, and mechanical, electrical, magnetic, catalytic and corrosion properties from those obtained by other techniques. The properties of electrodeposited metals and alloys are dependent on the temperature, pH and composition of the solution, current density, cathode material and cathodic diffusion layer thickness [12,14,19,22,[26][27][28][29][30].Tungsten and molybdenum can be co-deposited from aqueous solutions with iron-group metals [12,[31][32][33]. The kinetics and mechanism of co-deposition of these metals have been analyzed in a number of studies [31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Effect of deposition current density and annealing temperature on the microstructure and magnetic properties of nanostructured Ni-Fe-W-Cu alloys

et al. 2019

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Ni-FeW -Cu alloy powders were obtained by electrodeposition from an ammonium citrate bath at current densities ranging between 70 and 600 mA cm-2. As the deposition current density increased, the contents of Fe and W in the alloy increased, and those of Ni and Cu decreased. The total cathodic polarization curve was recorded, and partial polarization curves for Ni, Fe and W deposition and hydrogen evolution were determined. The current efficiency of alloy deposition was measured. The powders contained an amorphous matrix and FCC nanocrystals of the solid solution of Fe, W and Cu in Ni. At high current densities, small-sized nanocrystals exhibiting high internal microstrain values were formed. Powder particles were dendrite-and cauliflower-shaped. The dendrites had a large number of secondary branches and higher-order branches containing interconnected globules. The density of branches was higher in particles formed at high current densities. The powders formed at high current densities exhibited higher magnetization. Annealing at temperatures up to 460 °C resulted in structural relaxation, accompanied by an increase in magnetization. At temperatures above 460 °C, amorphous matrix crystallization and FCC crystal growth took place, accompanied by a decrease in magnetization.

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The effect of cathodic current density on the microstructure of electrochemically produced nanostructured powders of NixMo1–x alloys

Cited by 15 publications

References 22 publications

Preparation and Characterization of Electrochemically Deposited Cu₂O/ZnO Heterojunctions on Porous Silicon

Preparation and Characterization of Electrochemically Deposited Cu₂O/ZnO Heterojunctions on Porous Silicon

Morphological, microstructural and magnetic characteristics of electrodeposited Ni-Fe-W-Cu alloy powders

Effect of deposition current density and annealing temperature on the microstructure and magnetic properties of nanostructured Ni-Fe-W-Cu alloys

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The effect of cathodic current density on the microstructure of electrochemically produced nanostructured powders of NixMo1–x alloys

Cited by 15 publications

References 22 publications

Preparation and Characterization of Electrochemically Deposited Cu2O/ZnO Heterojunctions on Porous Silicon

Preparation and Characterization of Electrochemically Deposited Cu2O/ZnO Heterojunctions on Porous Silicon

Morphological, microstructural and magnetic characteristics of electrodeposited Ni-Fe-W-Cu alloy powders

Effect of deposition current density and annealing temperature on the microstructure and magnetic properties of nanostructured Ni-Fe-W-Cu alloys

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Preparation and Characterization of Electrochemically Deposited Cu₂O/ZnO Heterojunctions on Porous Silicon

Preparation and Characterization of Electrochemically Deposited Cu₂O/ZnO Heterojunctions on Porous Silicon