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采用循环伏安、方波伏安和开路计时电位等方法研究了Ho(Ⅲ)离子在LiCl-KCl共晶熔体中的电化学行为及Ho-Ni合金化机理。在惰性W电极上,Ho(Ⅲ)离子在-2.06 V(vs Ag/Ag Cl)发生电化学还原,该还原过程为3个电子转移的一步反应。与惰性W电极上的循环伏安相比,Ho(Ⅲ)离子在活性Ni电极的循环伏安曲线上还出现了3对氧化还原峰,是Ho与Ni形成了金属间化合物,导致了Ho(Ⅲ)离子在活性Ni电极发生了欠电位沉积。在不同的电位进行恒电位电解制备的3个不同的Ho-Ni合金,采用X-射线衍射(XRD)和扫描电子显微镜-能谱仪(SEM-EDS)等测试手段进行表征,结果表明:制备的3种合金分别是Ho2Ni17,Ho Ni5和Ho Ni23种合金化合物。
The electrochemical behavior and Ho-Ni alloying mechanism of Ho (Ⅲ) ion in LiCl-KCl eutectic melt were investigated by cyclic voltammetry, square wave voltammetry and open-circuit chronopotentiometry. On inert W electrode, Ho (Ⅲ) ion is electrochemically reduced at -2.06 V (vs Ag / Ag Cl), which is one-step reaction of three electron transfer. Compared with the cyclic voltammetry at inert W electrode, there are also three pairs of redox peaks on the cyclic voltammogram of Ho (Ⅲ) ion on the active Ni electrode, which is due to the formation of intermetallic compounds between Ho and Ni, which leads to the formation of Ho ( Ⅲ) ions in the active Ni electrode under-potential deposition occurred. Three different Ho-Ni alloys prepared by potentiostatic electrolysis at different potentials were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM-EDS). The results showed that the preparation of Of the three alloys are Ho2Ni17, Ho Ni5 and Ho Ni23 alloy compounds.