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

  • electrodeposition behavior of Nickel in the water and air stable 1 ethyl 3 methylimidazolium dicyanamide room temperature ionic liquid
    Electrochimica Acta, 2008
    Co-Authors: Mingjay Deng, Wen I Sun, Poyu Chen, Jengkuei Chang, Wenta Tsai
    Abstract:

    Abstract The electrodeposition behavior of Nickel was investigated at glassy carbon and polycrystalline copper electrodes in the 1-ethyl-3-methylimidazolium dicyanamide (EMI-DCA) room-temperature ionic liquid. Amperometric titration experiments suggest that Ni(II) reacted with DCA − anions forming [Ni(DCA) 4 ] 2− complex anion, which could be reduced to Nickel metal via a single-step electron transfer process. However, the anodic dissolution of the Nickel Deposits was sluggish. The electrodeposition of Nickel proceeds via three-dimensional progressive nucleation with diffusion-controlled growth on both glassy and copper substrates. Scanning electron microscopy images of the Nickel Deposits indicated that the morphology of the Nickel electroDeposits is dependent on the deposition potential. Atomic force microscopy topography illustrated that the roughness of the Nickel-deposited surface increased with decreasing deposition potential. The crystalline nature of the Nickel Deposits was revealed by powder X-ray diffraction spectroscopy results which indicated that the grains size of the Nickel Deposits decreased with decreasing deposition potential.

  • 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, Wen I 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%.

Wenta Tsai - One of the best experts on this subject based on the ideXlab platform.

  • electrodeposition behavior of Nickel in the water and air stable 1 ethyl 3 methylimidazolium dicyanamide room temperature ionic liquid
    Electrochimica Acta, 2008
    Co-Authors: Mingjay Deng, Wen I Sun, Poyu Chen, Jengkuei Chang, Wenta Tsai
    Abstract:

    Abstract The electrodeposition behavior of Nickel was investigated at glassy carbon and polycrystalline copper electrodes in the 1-ethyl-3-methylimidazolium dicyanamide (EMI-DCA) room-temperature ionic liquid. Amperometric titration experiments suggest that Ni(II) reacted with DCA − anions forming [Ni(DCA) 4 ] 2− complex anion, which could be reduced to Nickel metal via a single-step electron transfer process. However, the anodic dissolution of the Nickel Deposits was sluggish. The electrodeposition of Nickel proceeds via three-dimensional progressive nucleation with diffusion-controlled growth on both glassy and copper substrates. Scanning electron microscopy images of the Nickel Deposits indicated that the morphology of the Nickel electroDeposits is dependent on the deposition potential. Atomic force microscopy topography illustrated that the roughness of the Nickel-deposited surface increased with decreasing deposition potential. The crystalline nature of the Nickel Deposits was revealed by powder X-ray diffraction spectroscopy results which indicated that the grains size of the Nickel Deposits decreased with decreasing deposition potential.

A B Darintseva - One of the best experts on this subject based on the ideXlab platform.

  • features of hydrogen evolution during electrodeposition of loose Deposits of copper Nickel and zinc
    Journal of Electroanalytical Chemistry, 2020
    Co-Authors: V S Nikitin, T N Ostanina, V M Rudoi, T S Kuloshvili, A B Darintseva
    Abstract:

    Abstract Features of hydrogen evolution during electrodeposition of dendritic copper, zinc and Nickel Deposits were studied in the present paper. Data on the changes in hydrogen current density and its differential current efficiency as well as porosity of copper, zinc and Nickel Deposits during electrolysis were obtained. It was shown that the potential during the formation of dendritic metal Deposits is determined by the kinetic parameters of hydrogen reduction. Experimental data (the change in the electrode potential during electrodeposition and volume of evolved hydrogen) and hydrogen evolution kinetic parameters allowed to calculate the surface area available for hydrogen evolution during electrodeposition of loose metals. It was found that surface area available for hydrogen evolution increases during electrodeposition of loose metal under galvanostatic conditions. Morphology of dendrite particles and deposit growth rate are determined by metal nature, but properties of loose Deposits (change in porosity along the deposit thickness) depend on the intensity of hydrogen evolution during electrolysis.

Shiping Gou - One of the best experts on this subject based on the ideXlab platform.

  • 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, Wen I 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%.

Qinglong Wu - One of the best experts on this subject based on the ideXlab platform.

  • the physical and electrochemical properties of electroless deposited Nickel phosphorus black coatings
    Surface & Coatings Technology, 2006
    Co-Authors: Ning Li, Jian Zheng, Deyu Li, Qinglong Wu
    Abstract:

    The manufacture of electroless black Nickel surfaces had been obtained, through etching electroless Nickel Deposits by oxidizing acid solution. The morphology, chemical composition and reflectance of pre-etch and post-etch coatings were compared to examine influence of phosphorus and sulfur content on preparation of black surfaces. The non-metallic elements content of electroless Nickel Deposits was greatly improved after black treatment. It indicated the etching treatment was a selective dissolving process. The Nickel atoms can be preferentially removed during the period. Optimum phosphorus content range to produce low reflectance black surface was proposed, after reflectance measurement of black surfaces. Additionally, the effect of co-deposited phosphorus and sulfur atoms on corrosion resistance of electroless Nickel Deposits was evaluated by electrochemical impedance spectroscopy (EIS). The fitting results indicated that corrosion resistance of high-phosphorus electroless Nickel Deposits will be significantly reduced after black treatment. However, that of low-phosphorus Deposits will be improved.