An attempt to produce NiFe2O4 powder from electrodeposited Fe–Ni alloy powders by subsequent recrystallization in air

Lačnjevac, U.Č.; Jović, B.M.; Maksimović, Vesna; Jović, V.D.

doi:10.1007/s10800-009-0047-4

Cited by 10 publications

(5 citation statements)

References 35 publications

(43 reference statements)

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“…The stripping of Ni takes place in a wide potential range because of the kinetic hindrance of Ni dissolution, and a similar behavior is observed for the Fe-Ni alloy. The polarization behavior of the Fe-Ni electrolyte is in accord with the literature data in the sense that the deposition regime of these metals cannot be separated when both metal ions are present [14,15,20,[32][33][34]41,47,48]. At potentials more negative than −1 V, a monotonous increase in cathodic current density is observed.…”

Section: Polarization Characteristics Of the Fe-ni Systemsupporting

confidence: 87%

Near-substrate composition depth profile of direct current-plated and pulse-plated Fe–Ni alloys

Neuróhr

Csík

Vad

et al. 2013

Electrochimica Acta

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a b s t r a c t Composition depth profiles of d.c.-plated and pulse-plated Fe-Ni alloys have been investigated with the reverse depth profile analysis method. When d.c. plating is applied, the mole fraction of iron near the substrate is higher than during steady-state deposition since iron is preferentially deposited beside nickel and the achievement of the steady-state deposition condition takes time. The steady-state composition was achieved typically after depositing a 90-nm-thick alloy layer. In the pulse-plating mode, samples with nearly uniform composition could be obtained at a duty cycle of 0.2 or smaller, and a continuous change in the composition profile could be seen as a function of the duty cycle above this value. A constant sample composition was achieved with pulse-plating in a wide peak current density interval. The composition depth profile was also measured for a wide range of Fe 2+ concentration. The different characteristics of the composition depth profile as a function of the deposition mode can be explained mostly in terms of mass transport effects. The elucidation of the results is fully in accord with the kinetic models of anomalous codeposition and with the assumption of the superposition of a stationary and a pulsating diffusion layer. The results achieved help to identify the conditions for the deposition of ultrathin magnetic samples with uniform composition along the growth direction.

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Section: Polarization Characteristics Of the Fe-ni Systemsupporting

confidence: 87%

Near-substrate composition depth profile of direct current-plated and pulse-plated Fe–Ni alloys

Neuróhr

Csík

Vad

et al. 2013

Electrochimica Acta

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“…[8,10] Electrodeposition, whereby ap otential is appliedt od rive redox reactions on electrodes, is as uitable alternative forg alvanic displacement. [12,14,15,27] UV/Vis spectroscopy,X -ray diffraction (XRD), and focusedi on beam scanninge lectron microscopy with energy dispersive X-ray spectroscopy (FIB-SEM-EDX) wereu sed to demonstrate the feasibility of this simple, one-step metallization of NiFe 2 O 4 throughe lectrodeposition, resultingi nn ovel NiÀMo/NiFe 2 O 4 photocathodesw ith a NiFe 2 O 4 photoabsorbing layer and as tabilizing andc atalytic NiÀMo layer. [17,18] For am etal layer to be formed, cathodic electrodeposition is required.…”

Section: Introductionmentioning

confidence: 99%

Cathodic Electrodeposition of Ni−Mo on Semiconducting NiFe₂O₄ for Photoelectrochemical Hydrogen Evolution in Alkaline Media

et al. 2018

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Photocathodes for hydrogen evolution from water were made by electrodeposition of Ni-Mo layers on NiFe O substrates, deposited by spin coating on F:SnO -glass. Analysis confirmed the formation of two separate layers, without significant reduction of NiFe O . Bare NiFe O was found to be unstable under alkaline conditions during (photo)electrochemistry. To improve the stability significantly, the deposition of a bifunctional Ni-Mo layer through a facile electrodeposition process was performed and the composite electrodes showed stable operation for at least 1 h. Moreover, photocurrents up to -2.1 mA cm at -0.3 V vs. RHE were obtained for Ni-Mo/NiFe O under ambient conditions, showing that the new combination functions as both a stabilizing and catalytic layer for the photoelectrochemical evolution of hydrogen. The photoelectrochemical response of these composite electrodes decreased with increasing NiFe O layer thickness. Transient absorption spectroscopy showed that the lifetime of excited states is short and on the ns timescale. An increase in lifetime was observed for NiFe O of large layer thickness, likely explained by decreasing the defect density in the primary layer(s), as a result of repetitive annealing at elevated temperature. The photoelectrochemical and transient absorption spectroscopy results indicated that a short charge carrier lifetime limits the performance of Ni-Mo/NiFe O photocathodes.

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“…As the calcination temperature is increased to 1200 • C (Fig. 2d), the crystalline primary particles are observed clearly in the agglomerated secondary particles whose sizes are about 70-100 nm [15].…”

Section: Characterizationmentioning

confidence: 94%

Effects of Calcination Temperature on the Structural and Magnetic Properties of NiFe₂O₄Nanoparticles

Zhang

Zheng

et al. 2015

Integrated Ferroelectrics

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NiFe 2 O 4 nanoparticles have been synthesized by water-in-oil microemulsion method. Effects of calcination temperature varying from 600 to 1200 • C on the structural and magnetic properties of NiFe 2 O 4 nanoparticles have been investigated. Studies carried out using XRD, SEM and VSM techniques. Results indicated that magnetic properties of NiFe 2 O 4 nanoparticles showed great dependence on the variation of the crystallinity and particle sizes caused by the calcination temperature. The crystallization, saturation magnetization Ms and remenant magnetization Mr increased as the calcination temperature increased. But the variation of coercivity Hc was not in accordance with that of Ms and Mr, indicating that Hc was not determined only by the crystallinity and size of NiFe 2 O 4 nanoparticles.

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An attempt to produce NiFe2O4 powder from electrodeposited Fe–Ni alloy powders by subsequent recrystallization in air

Cited by 10 publications

References 35 publications

Near-substrate composition depth profile of direct current-plated and pulse-plated Fe–Ni alloys

Near-substrate composition depth profile of direct current-plated and pulse-plated Fe–Ni alloys

Cathodic Electrodeposition of Ni−Mo on Semiconducting NiFe₂O₄ for Photoelectrochemical Hydrogen Evolution in Alkaline Media

Effects of Calcination Temperature on the Structural and Magnetic Properties of NiFe₂O₄Nanoparticles

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An attempt to produce NiFe2O4 powder from electrodeposited Fe–Ni alloy powders by subsequent recrystallization in air

Cited by 10 publications

References 35 publications

Near-substrate composition depth profile of direct current-plated and pulse-plated Fe–Ni alloys

Near-substrate composition depth profile of direct current-plated and pulse-plated Fe–Ni alloys

Cathodic Electrodeposition of Ni−Mo on Semiconducting NiFe2O4 for Photoelectrochemical Hydrogen Evolution in Alkaline Media

Effects of Calcination Temperature on the Structural and Magnetic Properties of NiFe2O4Nanoparticles

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Product

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Cathodic Electrodeposition of Ni−Mo on Semiconducting NiFe₂O₄ for Photoelectrochemical Hydrogen Evolution in Alkaline Media

Effects of Calcination Temperature on the Structural and Magnetic Properties of NiFe₂O₄Nanoparticles