1-Ethyl-3-Methylimidazolium Chloride

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I-wen Sun - One of the best experts on this subject based on the ideXlab platform.

  • Direct electrodeposition of FeCoZn wire arrays from a zinc Chloride-based ionic liquid
    Electrochemistry Communications, 2011
    Co-Authors: Jia-ming Yang, Yi-ting Hsieh, Ding-xuan Zhuang, I-wen Sun
    Abstract:

    Abstract The use of Zinc Chloride-1-Ethyl-3-Methylimidazolium Chloride ionic liquid enables facile template-free electrochemical fabrication of arrays of polycrystalline ternary FeCoZn nanowires with diameter of 100–200 nm by controlling the deposition potential. The nanowire arrays were characterized by scanning electron microscopy, powder X-ray diffraction and transmission electron microscopy.

  • Heat-treatment induced material property variations of Al-coated Mg alloy prepared in aluminum Chloride/1-Ethyl-3-Methylimidazolium Chloride ionic liquid
    Surface and Coatings Technology, 2010
    Co-Authors: Mu Huan Chuang, Jeng-kuei Chang, Wen Ta Tsai, Ming-jay Deng, Pin Ju Tsai, I-wen Sun
    Abstract:

    Abstract An Al coating film, electrodeposited on a Mg alloy from aluminum Chloride1-Ethyl-3-Methylimidazolium Chloride (AlCl 3 –EMIC) ionic liquid, effectively prevents the substrate from rapid corrosion in a hostile environment. The thickness of the Al film can be easily determined by controlling the total cathodic charge applied, because the current efficiency of the electrodeposition reaction is close to 100%. Heat treatment at 450 °C under an argon atmosphere for 10 min causes an inter-diffusion at the Al/Mg interface, optimizing the protective performance of the coating film. Prolonging heating leads to a Mg 17 Al 12 intermetallic phase and a Mg solid solution phase to be formed at the expense of the deposited Al film. This phase transformation gives rise to a degradation in the corrosion resistance of the Al-coated sample.

  • Corrosion behaviors of materials in aluminum Chloride1-Ethyl-3-Methylimidazolium Chloride ionic liquid
    Electrochemistry Communications, 2010
    Co-Authors: Chien-hsiung Tseng, Jeng-kuei Chang, Jhen-rong Chen, Wen Ta Tsai, Ming-jay Deng, I-wen Sun
    Abstract:

    Abstract The corrosion properties of carbon steel (CS), 304 stainless steel (304 SS), and pure titanium (Ti) are first studied in aluminum Chloride1-Ethyl-3-Methylimidazolium Chloride ionic liquid (IL). An active-to-passive transition behavior was clearly observed for CS. The 304 SS exhibited the best stability among the materials; no considerable corrosion was recognized even in this high-Chloride environment. In contrast, although Ti resists corrosion in ambient environments, it was not passivated in the IL and became severely corroded under an anodic applied potential. The material corrosion behaviors and mechanisms in the non-aqueous, low-oxygen, and high-halogen-containing IL are completely different from those in traditional aqueous solutions.

  • Electrodeposition behavior of nickel and nickel–zinc alloys from the zinc Chloride-1-Ethyl-3-Methylimidazolium Chloride low temperature molten salt
    Electrochimica Acta, 2008
    Co-Authors: Shiping Gou, I-wen Sun
    Abstract:

    Abstract The electrodeposition of nickel and nickel–zinc alloys was investigated at polycrystalline tungsten electrode in the zinc Chloride-1-Ethyl-3-Methylimidazolium Chloride molten salt. Although nickel(II) Chloride dissolved easily into the pure Chloride-rich 1-Ethyl-3-Methylimidazolium Chloride ionic melt, metallic nickel could not be obtained by electrochemical reduction of this solution. The addition of zinc Chloride to this solution shifted the reduction of nickel(II) to more positive potential making the electrodeposition of nickel possible. The electrodeposition of nickel, however, requires an overpotential driven nucleation process. Dense and compact nickel deposits with good adherence could be prepared by controlling the deposition potential. X-ray powder diffraction measurements indicated the presence of crystalline nickel deposits. Non-anomalous electrodeposition of nickel–zinc alloys was achieved through the underpotential deposition of zinc on the deposited nickel at a potential more negative than that of the deposition of nickel. X-ray powder diffraction and energy-dispersive spectrometry measurements of the electrodeposits indicated that the composition and the phase types of the nickel–zinc alloys are dependent on the deposition potential. For the Ni–Zn alloy deposits prepared by underpotential deposition of Zn on Ni, the Zn content in the Ni–Zn was always less than 50 atom%.

  • Electrodeposition of Al coating on Mg alloy from Al Chloride/1-Ethyl-3-Methylimidazolium Chloride ionic liquids with different Lewis acidity
    Transactions of the IMF, 2008
    Co-Authors: Jeng-kuei Chang, Ming-jay Deng, I-wen Sun, Szu-jung Pan, M. H. Chuang, Wen Ta Tsai
    Abstract:

    AbstractElectrodeposition of a metallic Al layer on a Mg alloy from a Lewis acidic Al Chloride1-Ethyl-3-Methylimidazolium Chloride (EMIC) ionic liquid has been carried out at room temperature. The effects of the AlCl3 to EMIC molar ratio, in the range from 50%–50% to 60%–40%, on the electrodeposition characteristics were investigated. Scanning electron microscopy, X-ray energy dispersive spectroscopy, and X-ray diffractometry were used to examine the surface morphology, the chemical composition, and the crystal structure of the deposited layers prepared in the ionic liquids with different AlCl3 to EMIC ratios. The improvement of corrosion resistance of a Mg alloy to the Al surface coating was also evaluated by means of various electrochemical methods. The electrochemical impedance spectroscopic data indicated that while a bare Mg alloy had a polarisation resistance of only 470 Ω cm2 in 3˙5 wt-% NaCl solution, the Al coated sample deposited in the ionic liquid with 60%AlCl3 showed a resistance as high as ...

Charles L Hussey - One of the best experts on this subject based on the ideXlab platform.

  • Electrodeposition of Selenium from the 1-Ethyl-3-Methylimidazolium Chloride-Tetrafluoroborate Room-Temperature Ionic Liquid
    ECS Transactions, 2019
    Co-Authors: Li-hsien Chou, I‐wen Sun, Charles L Hussey
    Abstract:

    Selenium is a useful material in the production of photovoltaic cells for converting light into electricity. Compound semiconductors containing selenium may also have various optoelectric applications. The electrodeposition of selenium in aqueous solutions has been studied extensively. Nevertheless, the electrodeposition of selenium in aqueous solutions is usually complicated. It was found that deposition of crystalline selenium requires elevated temperatures, which from a practical standpoint, is difficult to achieve in aqueous plating baths. Therefore, the use of ionic liquids, especially air and water-stable systems, for the electrodeposition of selenium is of great interest due to their extraordinary physical properties. However, information about the electrodeposition of selenium from ionic liquids is fairly limited. In view of this fact, direct electrodeposition of selenium was investigated in the 1-Ethyl-3-Methylimidazolium Chloride tetrafluoroborate ionic liquids at two temperatures: 30 and 90 C. Cyclic voltammograms of Se(IV) at a glassy carbon electrode (Fig. 1A) indicate that Se(IV) can be reduced to an unknown low oxidation state Se species that can be reduced further to Se(0). Bulk deposition of selenium was conducted using potentiostatic electrolysis at glass substrates coated with conductive indium-doped tin oxide (ITO). An X-ray diffraction pattern for an electrodeposited film is shown in Fig. 1B. The samples were also examined with scanning electron microscopy (SEM), and Fig. 1C shows a micrograph of a typical sample. It was also found that the morphology of the selenium deposits is affected by the applied deposition potential.

  • Rechargeable aluminum batteries utilizing a chloroaluminate inorganic ionic liquid electrolyte
    Chemical communications (Cambridge England), 2018
    Co-Authors: Chih-yao Chen, Tetsuya Tsuda, Susumu Kuwabata, Charles L Hussey
    Abstract:

    Rechargeable aluminum batteries composed of an aluminum anode, an expanded graphite cathode, and an inorganic chloroaluminate ionic liquid electrolyte show remarkably improved capacity, reversibility, and rate capability at 393 K compared to cells based on a common organic salt based ionic liquid, AlCl3–1-Ethyl-3-Methylimidazolium Chloride.

  • anodic dissolution of aluminum in the aluminum Chloride 1 ethyl 3 methylimidazolium Chloride ionic liquid
    Journal of The Electrochemical Society, 2016
    Co-Authors: Chen Wang, Adam A Creuziger, Gery R Stafford, Charles L Hussey
    Abstract:

    The anodic dissolution of aluminum metal was investigated in the Lewis acidic chloroaluminate ionic liquid, aluminum Chloride-1-Ethyl-3-Methylimidazolium Chloride. The investigation was conducted on aluminum rotating disk electrodes as a function of potential, ionic liquid composition, and temperature. Two different dissolution mechanisms were realized. At modest overpotentials, dissolution takes place under mixed kinetic-mass transport control. However, as the overpotential is increased to induce higher dissolution rates and/or the ionic liquid is made more acidic, the dissolution reaction transitions to a potential-independent passivation-like process ascribed to the formation of a porous solid layer of AlCl3(s). At a fixed temperature and composition, the limiting passivation current density displays Levich behavior and also scales linearly with the concentration of AlCl4- in the ionic liquid. The heterogeneous kinetics of the Al dissolution reaction were measured in the active dissolution potential regime. The exchange current densities were independent of the composition of the ionic liquid, and the anodic transfer coefficients were close to zero and seemed to be independent of the Al grain size.

  • Electrodeposition of aluminum–hafnium alloy from the Lewis acidic aluminum Chloride-1-Ethyl-3-Methylimidazolium Chloride molten salt
    Journal of Solid State Electrochemistry, 2012
    Co-Authors: Tetsuya Tsuda, Gery R Stafford, Susumu Kuwabata, Charles L Hussey
    Abstract:

    The electrochemistry of Hf(IV) and the electrodeposition of Al–Hf alloys were examined in the Lewis acidic 66.7–33.3 mol% aluminum Chloride-1-Ethyl-3-Methylimidazolium Chloride molten salt containing HfCl4. When cyclic staircase voltammetry was carried out at a platinum disk electrode in this melt, the deposition and stripping waves for Al shifted to negative and positive potentials, respectively, suggesting that aluminum stripping is more difficult due to the formation of Al–Hf alloys. Al–Hf alloy electrodeposits containing ~13 at.% Hf were obtained on Cu rotating wire and cylinder electrodes. The Hf content in the Al–Hf alloy deposits depended on the HfCl4 concentration in the melt, the electrodeposition temperature, and the applied current density. The deposits were composed of dense crystals and were completely Chloride-free. The Chloride-induced pitting corrosion potential of the resulting Al–Hf alloys was approximately +0.30 V against pure aluminum when the Hf content was above 10 at.%.

  • Electrodeposition of photocatalytic AlInSb semiconductor alloys in the Lewis acidic aluminum Chloride1-Ethyl-3-Methylimidazolium Chloride room-temperature ionic liquid
    Thin Solid Films, 2008
    Co-Authors: Tetsuya Tsuda, Charles L Hussey
    Abstract:

    Abstract The electrodeposition of AlIn, AlSb, and AlInSb alloys was examined at copper rotating wire electrodes in the Lewis acidic 66.7–33.3 mol.% (m/o) aluminum Chloride–1–ethyl–3–methylimidazolium Chloride room-temperature ionic liquid. The Sb content in the AlSb binary electrodeposits depended on the applied current density, but the In content in the AlIn alloys was quite low, ∼ 1 at.% (a/o), and independent of the current density. Variation of the partial current densities for the In and Sb during AlInSb deposition suggested that the deposition of a second phase rich in In and Sb, possibly InSb, occurs simultaneously at higher applied current densities. However, no X-ray diffraction patterns are apparent in these deposits other than that for face-centered cubic Al. Thus, the AlInSb deposit most likely consists of a non-equilibrium mixture of Al x In y Sb 100– x – y and amorphous or nanocrystalline InSb. The AlInSb alloy semiconductor deposits prepared during this investigation exhibited photocatalytic behavior and could catalyze the photodecomposition of water under illumination with visible light.

Zhen Yang - One of the best experts on this subject based on the ideXlab platform.

  • isobaric vapor liquid equilibrium of ethanenitrile water 1 2 ethanediol 1 ethyl 3 methylimidazolium Chloride
    Fluid Phase Equilibria, 2014
    Co-Authors: Huan Liu, Xianbao Cui, Ying Zhang, Tianyang Feng, Zhen Yang
    Abstract:

    Abstract The vapor–liquid equilibrium (VLE) data for the quaternary system ethanenitrile + water + 1,2-ethanediol + 1-Ethyl-3-Methylimidazolium Chloride ([EMIM]Cl) were measured at 102.5 kPa. The experimental VLE data were correlated with the nonrandom two liquid (NRTL) activity coefficient model, and the binary interaction parameters were obtained. The results show that the mixed entrainer of [EMIM]Cl and 1,2-ethanediol can eliminate the azeotropic point of ethanenitrile and water; the selectivity of [EMIM]Cl is higher than that of 1,2-ethanediol; the relative volatility of ethanenitrile to water increases with the increase of the mole fraction of mixed solvent (1,2-ethanediol + [EMIM]Cl) and the amount of [EMIM]Cl in mixed solvent, but there is no synergetic effect between 1,2-ethanediol and [EMIM]Cl. The main functions of 1,2-ethanediol are to dissolve ionic liquid and to reduce the viscosity of the entrainer.

  • Isobaric vapor–liquid equilibrium of ethanenitrile + water + 1,2-ethanediol + 1-Ethyl-3-Methylimidazolium Chloride
    Fluid Phase Equilibria, 2014
    Co-Authors: Liu Huan, Xianbao Cui, Ying Zhang, Tianyang Feng, Zhen Yang
    Abstract:

    Abstract The vapor–liquid equilibrium (VLE) data for the quaternary system ethanenitrile + water + 1,2-ethanediol + 1-Ethyl-3-Methylimidazolium Chloride ([EMIM]Cl) were measured at 102.5 kPa. The experimental VLE data were correlated with the nonrandom two liquid (NRTL) activity coefficient model, and the binary interaction parameters were obtained. The results show that the mixed entrainer of [EMIM]Cl and 1,2-ethanediol can eliminate the azeotropic point of ethanenitrile and water; the selectivity of [EMIM]Cl is higher than that of 1,2-ethanediol; the relative volatility of ethanenitrile to water increases with the increase of the mole fraction of mixed solvent (1,2-ethanediol + [EMIM]Cl) and the amount of [EMIM]Cl in mixed solvent, but there is no synergetic effect between 1,2-ethanediol and [EMIM]Cl. The main functions of 1,2-ethanediol are to dissolve ionic liquid and to reduce the viscosity of the entrainer.

Tetsuya Tsuda - One of the best experts on this subject based on the ideXlab platform.

  • Rechargeable aluminum batteries utilizing a chloroaluminate inorganic ionic liquid electrolyte
    Chemical communications (Cambridge England), 2018
    Co-Authors: Chih-yao Chen, Tetsuya Tsuda, Susumu Kuwabata, Charles L Hussey
    Abstract:

    Rechargeable aluminum batteries composed of an aluminum anode, an expanded graphite cathode, and an inorganic chloroaluminate ionic liquid electrolyte show remarkably improved capacity, reversibility, and rate capability at 393 K compared to cells based on a common organic salt based ionic liquid, AlCl3–1-Ethyl-3-Methylimidazolium Chloride.

  • Electrodeposition of aluminum–hafnium alloy from the Lewis acidic aluminum Chloride-1-Ethyl-3-Methylimidazolium Chloride molten salt
    Journal of Solid State Electrochemistry, 2012
    Co-Authors: Tetsuya Tsuda, Gery R Stafford, Susumu Kuwabata, Charles L Hussey
    Abstract:

    The electrochemistry of Hf(IV) and the electrodeposition of Al–Hf alloys were examined in the Lewis acidic 66.7–33.3 mol% aluminum Chloride-1-Ethyl-3-Methylimidazolium Chloride molten salt containing HfCl4. When cyclic staircase voltammetry was carried out at a platinum disk electrode in this melt, the deposition and stripping waves for Al shifted to negative and positive potentials, respectively, suggesting that aluminum stripping is more difficult due to the formation of Al–Hf alloys. Al–Hf alloy electrodeposits containing ~13 at.% Hf were obtained on Cu rotating wire and cylinder electrodes. The Hf content in the Al–Hf alloy deposits depended on the HfCl4 concentration in the melt, the electrodeposition temperature, and the applied current density. The deposits were composed of dense crystals and were completely Chloride-free. The Chloride-induced pitting corrosion potential of the resulting Al–Hf alloys was approximately +0.30 V against pure aluminum when the Hf content was above 10 at.%.

  • Electrodeposition of photocatalytic AlInSb semiconductor alloys in the Lewis acidic aluminum Chloride1-Ethyl-3-Methylimidazolium Chloride room-temperature ionic liquid
    Thin Solid Films, 2008
    Co-Authors: Tetsuya Tsuda, Charles L Hussey
    Abstract:

    Abstract The electrodeposition of AlIn, AlSb, and AlInSb alloys was examined at copper rotating wire electrodes in the Lewis acidic 66.7–33.3 mol.% (m/o) aluminum Chloride–1–ethyl–3–methylimidazolium Chloride room-temperature ionic liquid. The Sb content in the AlSb binary electrodeposits depended on the applied current density, but the In content in the AlIn alloys was quite low, ∼ 1 at.% (a/o), and independent of the current density. Variation of the partial current densities for the In and Sb during AlInSb deposition suggested that the deposition of a second phase rich in In and Sb, possibly InSb, occurs simultaneously at higher applied current densities. However, no X-ray diffraction patterns are apparent in these deposits other than that for face-centered cubic Al. Thus, the AlInSb deposit most likely consists of a non-equilibrium mixture of Al x In y Sb 100– x – y and amorphous or nanocrystalline InSb. The AlInSb alloy semiconductor deposits prepared during this investigation exhibited photocatalytic behavior and could catalyze the photodecomposition of water under illumination with visible light.

  • Electrochemistry in ultrahigh vacuum: underpotential deposition of Al on polycrystalline W and Au from room temperature AlCl(3)/1-Ethyl-3-Methylimidazolium Chloride melts.
    The journal of physical chemistry. B, 2005
    Co-Authors: Matthew Gerard Johnston, Tetsuya Tsuda, Charles L Hussey, Jae-joon Lee, Gary S. Chottiner, Barry Miller, Daniel A. Scherson
    Abstract:

    The voltammetric characteristics of polycrystalline Au and W electrodes cleaned (thermal annealing at 1100 K) and characterized (Auger electron spectroscopy) in ultrahigh vacuum (UHV) have been examined in ultrapure AlCl 3 /1-Ethyl-3-Methylimidazolium Chloride (EtMeImCl) melts in UHV. These experiments were performed using a custom-designed transfer system that allows for the all-Al electrochemical cell to be filled with EtMeImCl in an auxiliary UHV chamber and later transferred under UHV to the main UHV chamber that houses the Auger electron spectrometer. The results obtained for the underpotential (UPD) and bulk deposition of Al on Au were found to be very similar to those reported in the literature for measurements carried out under 1 atm of an inert gas in a glovebox. For the far more reactive W surfaces, voltammetric features ascribed to the stripping of underpotential-deposited Al could be observed following a single scan from 1.0 V vs Al 3 + /Al to a potential negative enough for bulk deposition of Al to ensue. This behavior is unlike that reported in the literature for experiments performed in a glovebox, which required either extensive potential cycling in the Al bulk deposition and stripping region or excursions to potentials positive enough for chlorine evolution to ensue for Al UPD features to be clearly discerned. These observations open new prospects for fundamental electrochemical studies of well-characterized, highly reactive metals, including single crystals, in a variety of low vapor pressure ionic liquids.

  • Electrodeposition of Al-Mo Alloys from the Lewis Acidic Aluminum Chloride-1-Ethyl-3-Methylimidazolium Chloride Molten Salt
    Journal of The Electrochemical Society, 2004
    Co-Authors: Tetsuya Tsuda, Charles L Hussey, Gery R Stafford
    Abstract:

    The electrochemistry of Zr(IV) and Zr(II) and the electrodeposition of Al-Zr alloys were examined in the Lewis acidic 66.7-33.3 mol % aluminum Chloride-1-Ethyl-3-Methylimidazolium Chloride molten salt at 353 K. The electrochemical reduction of Zr(lV) to Zr(II) is complicated by the precipitation of ZrCl 3 ; however, solutions of Zr(II) can be prepared by reducing Zr(IV) with Al wire. Al-Zr alloys can be electrodeposited from plating baths containing either Zr(IV) or Zr(II), but for a given concentration and current density, baths containing Zr(IV) lead to Al-Zr alloys with the higher Zr content. This result was traced to the diminutive concentration-dependent diffusion coefficient for Zr(II). It was possible to prepare Al-Zr alloys containing up to ∼17% atomic fraction (atom %) Zr. The structure of these deposits depended on the Zr content. Alloys containing less than 5 atom % Zr could be indexed to a disordered face-centered cubic structure similar to pure Al, whereas alloys containing ∼17 atom % Zr were completely amorphous (metallic glass). The Chloride pitting potentials of alloys with more than 8 atom % Zr were approximately +0.3 V relative to pure Al.

Robert A. Osteryoung - One of the best experts on this subject based on the ideXlab platform.