Morphology and composition of the Fe–Ni powders electrodeposited from citrate containing electrolytes

Maksimović³

et al. 2009

J Appl Electrochem

Self Cite

The electrodeposition of the Fe-Ni powders from citrate-ammonium chloride containing electrolytes for different Ni/Fe ions concentration ratios at pH 4.0 was investigated by the polarization measurements. The morphology, chemical composition, and phase composition of the obtained powders were investigated using SEM, EDS, and XRD analysis. EDS analysis of as-deposited alloy powders confirmed anomalous co-deposition of Fe and Ni. A common characteristic for all as-deposited powder samples was the presence of cone-shaped cavities and nodules on the big agglomerates of the order of 200-400 lm. After annealing in air at 400, 600, and 700°C for 3 h, all alloy powders oxidized forming NiO, NiFe 2 O 4 , and Fe 2 O 3 phases in different proportions depending on the original powder composition. The NiFe 2 O 4 phase was found to be dominant in the sample with the highest percentage of Fe after annealing at 600°C.

Section: Introductionmentioning

confidence: 99%

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

Lačnjevac

Maksimović³

et al. 2009

J Appl Electrochem

Self Cite

“…The intensity of Ni peaks (■) was found to decrease with increasing annealing temperature for Ni/Fe ratios 9/1, 3/1, and 1/1, with C, 600 C, and 700 C for 3 h (Reprinted from [62] with the permission of Springer-Verlag.) C, 600 C, and 700 C for 3 h (Reprinted from [62] with the permission of Springer-Verlag.…”

Section: Formation Of Nife 2 O 4 By the Oxidation Of Fe-ni Alloy Powdersmentioning

confidence: 94%

“…Among our recent papers [62,63] the electrodeposition of Fe-Ni alloy powders was the subject of only few papers. Zhelibo et al [64,65] suggested a method for producing very fine Fe-Ni alloy powder by electrolysis in a two-layer electrolytic bath, using a hydrocarbon solvent from an oil refining fraction as an upper organic layer with evaporation at 180 C, and subsequent reduction annealing in a hydrogen atmosphere.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Morphology, Chemical, and Phase Composition of Electrodeposited Co–Ni, Fe–Ni, and Mo–Ni–O Powders

Lačnjevac

Modern Aspects of Electrochemistry

2012

The alloy powders of the iron-group metals are of great interest for many industrial applications .Ultrafine Co-Ni powders showed significant promise for future development of hard materials [1,2], magnetic materials [3][4][5], commercial batteries [6], catalysts [7][8][9], catalyzing electroplates [10,11], hydrogen absorbing alloy anodes [12], and magnetoresistive sensors [13,14]. The powders for these applications were made by several different techniques such as mechanical alloying-ball milling [15,16], sonochemical synthesis [17][18][19], chemical reduction [13,14,[20][21][22][23], synthesis in microemulsion [24,25]

“…Ova vrednost j je, između ostalog, odabrana zbog poređenja rezultata sa drugim ispitivanjima elektrokatalitički aktivnih prevlaka [30,31,71]. Elektrodni potencijal, nakon određenog vremena, pri konstantnoj vrednosti gustine struje, postiže konstantnu vrednost, stoga je kao mera katalitičke aktivnosti ispitanih elektroda, odabrana vrednost potencijala elektrode u odnosu na potencijal referentne elektrode, nakon 1200 s na primenjenoj gustini struje elektrolize (E 300 ).…”

Section: Ni-w Katode Za Alkalnu Elektrolizuunclassified

New cathode materials for hydrogen evolution produced by electrochemical codeposition of Ni and Co with Mo and W - influence of microwave radiation on their physicochemical properties

Tasić¹