Study of electrochemical redox of gold for refining in non-aqueous electrolyte

Lee, Jae-O; Park, Gwangwon; Park, Jesik; Cho, Young-Ju; Lee, Churl Kyoung

doi:10.1007/s12541-015-0159-1

Cited by 6 publications

(4 citation statements)

References 8 publications

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“…2 Fluorine-based RTILs are typically used for reducing the friction coefficient at a macroscale. 1,[3][4][5][6][7] These RTILs exhibit a low friction coefficient; however, they can cause severe corrosion in the sliding parts. 1 Therefore, the tribological performance of cyano-based RTILs has been investigated.…”

Section: In Addition the Interaction Of Water And [Emim][dcn] Was Evmentioning

confidence: 99%

“…They exhibit numerous remarkable physical and chemical properties such as low vapor pressure, high thermal stability, high ionic conductivity, flame resistance, and a wide electric potential window . Fluorine‐based RTILs are typically used for reducing the friction coefficient at a macro‐scale . These RTILs exhibit a low friction coefficient; however, they can cause severe corrosion in the sliding parts .…”

Section: Introductionmentioning

confidence: 99%

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Effect of water on the interfacial structures of room‐temperature ionic liquids

Kawada

Kodama

Sato

et al. 2018

Surface & Interface Analysis

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The interfacial structures of cyano‐based room‐temperature ionic liquids play a very important role in reducing friction. However, the presence of water impairs their tribological performance. The interfacial structures and friction forces of 1‐ethyl‐3‐methylimidazolium dicyanamide, [EMIM][DCN], and the effect of water on these structures and forces were investigated using atomic force microscopy. In addition, the interaction of water and [EMIM][DCN] was evaluated using Fourier‐transform infrared (FT‐IR) spectroscopy. Multiple repulsive layers were observed in the [EMIM][DCN] solution. This solution showed low friction force because these repulsive layers worked as protective layers against friction. On the other hand, the specific repulsive layer characteristics of [EMIM][DCN] could not be observed in a [EMIM][DCN] + 2 wt% H2O solution. FT‐IR results indicated that the layer structure of [EMIM][DCN] was disturbed by the addition of H2O. Therefore, the solution containing water exhibited a high friction force.

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Section: In Addition the Interaction Of Water And [Emim][dcn] Was Evmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of water on the interfacial structures of room‐temperature ionic liquids

Kawada

Kodama

Sato

et al. 2018

Surface & Interface Analysis

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“…Ionic liquids have received considerable attention as an alternative solvent for the electrochemical synthesis of metals because of their high thermal and chemical stability, relatively high ionic conductivity, and wide electrochemical window [19][20][21][22][23]. In addition, the ionic liquids are known to be eco-friendly solvents because they are reusable and do not generate volatile organic compounds [24,25].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Silver Nanoparticles using Pulse Electrolysis in 1-n-butyl-3-methylimidazolium Chloride Ionic Liquid

Jang¹,

Kim²,

Lee³

et al. 2023

J. Electrochem. Sci. Technol

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Ionic liquids are considered as a promising, alternative solvent for the electrochemical synthesis of metals because of their high thermal and chemical stability, relatively high ionic conductivity, and wide electrochemical window. In particular, their wide electrochemical window enables the electrodeposition of metals without any side reaction of electrolytes such as hydrogen evolution. The electrodeposition of silver is conducted in 1-n-butyl-3-methylimidazolium chloride ([C4mim]Cl) ionic liquid system with a silver source of AgCl. This study is the first attempt to electrodeposit silver nanoparticles without using co-solvents other than [C4mim]Cl. Pulse electrolysis is employed for the synthesis of silver nanoparticles by varying applied potentials from -3.0 V to -4.5 V (vs. Pt-quasi reference electrode) and pulse duration from 0.1 s to 0.7 s. Accordingly, the silver nanoparticles whose size ranges from 15 nm to ~100 nm are obtained. The successful preparation of silver nanoparticles is demonstrated regardless of the kinds of substrate including aluminum, stainless steel, and carbon paper in the pulse electrolysis. Finally, the antimicrobial property of electrodeposited silver nanoparticles is confirmed by an antimicrobial test using Staphylococcus aureus.

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“…Ionic liquids (ILs) are gradually receiving attention as an alternative solvent for electrochemical treatment of precious metals, due to their high thermal and chemical stabilities, low vapor pressures, relatively high ionic conductivities and wide electrochemical windows [14][15]. In addition, ILs have received considerable attention as eco-friendly solvents because they can be reused and do not generate volatile organic compounds and a side reaction such as H 2 evolution [16][17].…”

Section: Introductionmentioning

confidence: 99%

Rapid Synthesis of Gold Nano-Particles Using Pulse Waved Potential in a Non-Aqueous Electrolyte

Jang¹,

Lee²,

Lee³

2017

Archives of Metallurgy and Materials

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Rapid synthesis of gold nanoparticles (AuNPs) by pulsed electrodeposition was investigated in the non-aqueous electrolyte, 1-ethyl-3-methyl-imidazoliumbis(trifluoro-methanesulfonyl)imide ([EMIM]TFSI) with gold trichloride (AuCl 3 ). To aid the dissolution of AuCl 3 , 1-ethyl-3-methyl-imidazolium chloride ([EMIM]Cl) was used as a supporting electrolyte in [EMIM]TFSI. Cyclic voltammetry experiments revealed a cathodic reaction corresponding to the reduction of gold at −0.4 V vs. Pt-QRE. To confirm the electrodeposition process, potentiostatic electrodeposition of gold in the non-aqueous electrolyte was conducted at −0.4 V for 1 h at room temperature. To synthesize AuNPs, pulsed electrodeposition was conducted with controlled duty factor, pulse duration, and overpotential. The composition, particle-size distribution, and morphology of the AuNPs were confirmed by field-emission scanning electron microscopy (FE-SEM), energy-dispersive spectroscopy (EDS), and transmission electron microscopy (TEM). The electrodeposited AuNPs were uniformly distributed on the platinum electrode surface without any impurities arising from the non-aqueous electrolyte. The size distribution of AuNPs could be also controlled by the electrodeposition conditions.

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Study of electrochemical redox of gold for refining in non-aqueous electrolyte

Cited by 6 publications

References 8 publications

Effect of water on the interfacial structures of room‐temperature ionic liquids

Effect of water on the interfacial structures of room‐temperature ionic liquids

Synthesis of Silver Nanoparticles using Pulse Electrolysis in 1-n-butyl-3-methylimidazolium Chloride Ionic Liquid

Rapid Synthesis of Gold Nano-Particles Using Pulse Waved Potential in a Non-Aqueous Electrolyte

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