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采用循环伏安、方波伏安和开路计时电位等电化学方法研究了Dy(III)离子在Li Cl-KCl共晶盐中的电化学行为及Dy-Ni合金形成的电化学机理.循环伏安和方波伏安法研究表明,Dy(III)离子的电化学还原过程为三个电子转移的一步反应.与惰性W电极相比,Dy(III)离子在Ni电极上的循环伏安曲线多出了三对氧化还原峰,是由于Dy与Ni形成了合金化合物,导致Dy(III)离子在活性Ni电极发生了欠电位沉积.采用X射线衍射(XRD)和扫描电子显微镜(SEM)附带能量散射谱(EDS)对恒电位(-1.6,-1.8和-2.0 V)电解制备的Dy-Ni合金进行分析,分别获得了DyNi_5,Dy_2Ni_7和DyNi_2金属间化合物.实验结果表明,通过控制电位进行恒电位电解可以有选择性地制备不同的金属间化合物.
The electrochemical behavior of Dy (III) ions in LiCl-KCl eutectic salts and the electrochemical mechanism of Dy-Ni alloy formation were investigated by cyclic voltammetry, square wave voltammetry and open-circuit chronopotentiometry. An and square wave voltammetry studies show that the electrochemical reduction of Dy (III) ions is one-step reaction of three electron transfer.Compared with the inert W electrode, the cyclic voltammetry of Dy (III) ions on the Ni electrode More than three pairs of redox peaks were obtained due to the formation of alloying compounds of Dy and Ni, which led to the underpotential deposition of Dy (III) ions on the active Ni electrode. XRD and SEM DyNi_5, Dy_2Ni_7 and DyNi_2 intermetallic compounds were obtained by energy dispersive spectroscopy (EDS) at potentials (-1.6, -1.8 and -2.0 V) respectively.The experimental results show that by controlling potential Potentiostatic electrolysis can selectively prepare different intermetallic compounds.