Additives-assisted electrodeposition of fine spherical copper powder from sulfuric acid solution

Lou, Wenbo; Cai, Weiquan; Li, Ping; Su, Junling; Zheng, Shili; Zhang, Yi; Jin, Wei

doi:10.1016/j.powtec.2017.12.060

Cited by 28 publications

(12 citation statements)

References 12 publications

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“…Walsh et al reported a rotating cylinder electrode reactor for the dilute 0.5 g/L precious palladium recovery from acidic solutions, in which 99% recovery ratio was achieved within 30 min treatment. Most recently, the emew system attracts increasing attention for the dilute metal electrodeposition, in which an IrO 2 –Ta 2 O 5 decorated titanium anode is in the center and low-cost stainless steel foil surrounds the tube. − Therefore, the aim of this investigation is to develop a selective and efficient electrochemical extraction of dilute copper and tellurium from harsh hydrochloric acid solutions. The electrodeposition behavior in acidic solutions is investigated by real-time synchrotron radiation X-ray imaging technique.…”

Section: Introductionmentioning

confidence: 99%

Selective and Efficient Electrochemical Recovery of Dilute Copper and Tellurium from Acidic Chloride Solutions

Jin

2018

ACS Sustainable Chem. Eng.

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Sustainable recovery of tellurium (Te) from large-scale wastewater is of great importance to offer stable supply of this strategic element. However, the concentration of tellurium is very low, and there is usually coexisting metallic ion of copper. In this study, a novel selective and efficient electrochemical extraction of Te and Cu from HCl solutions was first reported with stainless steel electrode. The interfacial growth behavior of electrodeposition was measured by the emerging in situ synchrotron radiation dynamic X-ray images. A turbulent reactor was employed for the stepwise electrodeposition, and nanometric powder was produced owing to the largely improved mass transport. High-purity 93.2% tellurium and 98.3% copper were selectively and efficiently recovered with the current efficiency of ∼85% and extraction ratio of ∼95%. This mass transport assisted method may be explored as a promising solution to overcome the limitation of present metal recycling and water purification.

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Section: Introductionmentioning

confidence: 99%

Selective and Efficient Electrochemical Recovery of Dilute Copper and Tellurium from Acidic Chloride Solutions

Jin

2018

ACS Sustainable Chem. Eng.

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“…28 Copper particles of spherical shape have been obtained by electrolysis processes only in the presence of additives, such as a combination of potassium ferrocyanide and 2,2′-dipyridine. 15 In this study, it was shown that it is possible to obtain spherical-shaped particles under controlled conditions of electrolysis from electrolytes without the addition of additives by regulation of the duration of the electrolysis time. Certainly, further investigations in this direction will be continued in the future.…”

Section: Resultsmentioning

confidence: 97%

“…Significant effects on the morphology of Cu powder particles can be achieved by the addition of specific substances, known as additives, to the electrolytes for Cu electrolysis. 11,14,15 The design of the experiments also plays an important role in the production of Cu powder by electrolysis. 1,16 From the other relevant parameters and factors of electrolysis affecting morphology of the particles, it is necessary to indicate temperature, circulation rate, type of working electrode, etc.…”

Section: Introductionmentioning

confidence: 99%

Overpotential controls a morphology of electrolytically produced copper dendritic forms

et al. 2019

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The morphologies of copper dendritic forms obtained in both potentiostatic and galvanostatic regimes of electrolysis with various amounts of the electricity were analyzed by the scanning electron microscopy (SEM) technique. Irrespective of amount of passed electricity, 3D (three dimensional) pine-like dendrites with sharp tips were formed in the potentiostatic regime of electrolysis. On the other hand, the amount of passed electricity had a strong effect on the shape of the 3D pine-like dendrites formed in the galvanostatic regime of electrolysis. Dendrites with sharp tips were formed with smaller amount of passed electricity, while dendrites with globular tips were formed with larger amounts. The change in the shape of the galvanostatically synthesized 3D pine-like dendrites was explained by comparison with copper deposits obtained potentiostatically at overpotentials that corresponded to the final overpotentials during galvanostatic regime of electrolysis for the analyzed amounts of electricity. Based on the similarity of the obtained morphologies at the macro level, it was concluded that the overpotential plays a crucial role in the formation of the electrolytically synthesized dendrites and that the controlled conditions of electrolysis could represent a suitable way for a synthesis of spherical Cu particles by electrolysis.

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“…The formation of globular particles, i.e., almost ideal spheres, is primarily a feature of some other methods of powder production, such as the ultrasonic spray pyrolysis [3] and the gas-atomizing process [49]. The spherical particles can be also produced by electrolysis in the presence of additional agents such as a combination of potassium ferrocyanide and 2,2 -dipyridine [50]. Without additives, the globules as a constitutive element of the 3D dendrites can be only obtained galvanostatically under the controlled conditions of electrolysis.…”

Section: Correlation Between Morphology and Crystal Structure Of The Powder Particlesmentioning

confidence: 99%

Correlation of Morphology and Crystal Structure of Metal Powders Produced by Electrolysis Processes

Nikolić

Maksimović

Avramović

2021

Metals

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In this review paper, morphologies of metal powders produced by the constant (potentiostatic and galvanostatic) regimes of electrolysis from aqueous electrolytes are correlated with their crystal structure at the semiquantitative level. The main parameters affecting the shape of powder particles are the exchange current density (rate of electrochemical process) and overpotential for hydrogen evolution reaction. Depending on them, various shapes of dendrites (the needles, the two-dimensional (2D) fern-like, and the three-dimensional (3D) pine-like dendrites), and the particles formed under vigorous hydrogen evolution (cauliflower-like and spongy-like particles) are produced by these regimes of electrolysis. By decreasing the exchange current density value, the crystal structure of the powder particles is changed from the strong (111) preferred orientation obtained for the needle-like (silver) and the 2D (lead) dendrites to the randomly orientated crystallites in particles with the spherical morphology (the 3D dendrites and the cauliflower-like and the spongy-like particles). The formation of metal powders by molten salt electrolysis and by electrolysis in deep eutectic solvents (DESs) and the crystallographic aspects of dendritic growth are also mentioned in this review.

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Additives-assisted electrodeposition of fine spherical copper powder from sulfuric acid solution

Cited by 28 publications

References 12 publications

Selective and Efficient Electrochemical Recovery of Dilute Copper and Tellurium from Acidic Chloride Solutions

Selective and Efficient Electrochemical Recovery of Dilute Copper and Tellurium from Acidic Chloride Solutions

Overpotential controls a morphology of electrolytically produced copper dendritic forms

Correlation of Morphology and Crystal Structure of Metal Powders Produced by Electrolysis Processes

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