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Electrochemical Character and Odeposition of Er (Ⅲ)、Co (Ⅱ)、Ni(Ⅱ) in Dimethylformamide

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Tutor: WangJianChao
School: Qinghai Normal
Course: Inorganic Chemistry
Keywords: Codeposition,Cyclic voltammetry,Chronoamperometry,Chronocoulometry,Tafel curves
CLC: TB383.2
Type: Master's thesis
Year:  2010
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Abstract:
Rare earth alloy functional materials in high-tech industries of concern in recent years, the rapid growth of rare earth application in the field of magnetic materials, luminescent materials, hydrogen storage materials, catalytic materials. The rare earth alloy functional materials in the high-tech from the 1970s, has entered a stage of rapid development, and the rapid formation of high-tech industries, especially rare earth and iron group elements formed alloy material present study more. The rare earth alloy functional membrane material prepared by vacuum vapor deposition, cathode sputtering, ion plating, and other physical vapor deposition techniques, but these methods have the disadvantages of high cost and complex process. In contrast, the electrodeposition method, low cost, simple process and system alloy membrane morphology, physical properties, be a good method. Common electrodeposition method main rules of deposition, irregular codeposition, balance co-deposition, the co-deposition of an abnormality, the induction codeposition According to REE own nature, we used the induction of the deposition method, cobalt, nickel and iron group element induced rare earth elements in the formation of the rare earth and cobalt or rare earth nickel alloy membrane materials. Select the appropriate electrodeposition system is also the key to the preparation of a rare earth alloy film material, according to the nature of the rare earth itself, we choose an organic solvent N, N-dimethyl formamide (DMF) as the an electrodeposition system based solvent. First of DMF conductivity is measured using a conductivity meter, added to the DMF solvent the support electrolyte LiCIO 4 , with LK2005C electrochemical workstation to make the system of the cyclic voltammogram (CV) can be drawn by the FIG. DMF-LiClO electrochemical window 4 system. To DMF-LiClO 4 added NiCl 2 or CoCl 2 the dubbed the NiCl 2 -LiClO 4 -DMF or CoCl 2 -LiClO 4 -two system of DMF, by LK2005C electrochemical workstation to make the system cyclic voltammetry Figure single potential order the hop chronoamperometry FIG Chronocoulometry Figure, the Tafel curves derived according to FIG corresponding data, are respectively determined transfer coefficient α of the two systems, the diffusion coefficient D 0 , the current density j 0 , drawn according to the comparative analysis of the obtained coefficient of the degree of difficulty, electrodeposited electrodeposition reversibility. Select Er (NO 3 ) 3 -NiCl 2 -LiClO 4 -DMF and Er (NO 3 ) 3 -CoCl -LiClO 4 -DMF system as electrodeposition system by cyclic voltammetry system research to identify appropriate peak potential by inducing co-deposition of the alloy film preparation of rare earth and iron group elements, and by low vacuum scanning electron microscopy-X-ray energy dispersive spectroscopy it morphology of alloys of rare earth Er content.
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