| 在LiCl-KCl共晶熔体中电化学制备钬镍金属间化合物 |
| The electrochemical formation of Ho-Ni intermetallic compounds in the LiCl-KCl eutectic melts |
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| 摘要: 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/AgCl)发生电化学还原,该还原过程为三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三对氧化还原峰,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三个不同的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：制备的三种合金分别是Ho2Ni17,HoNi5 和 HoNi2 三种合金化合物。 |
| 关键词: 电化学制备 钬-镍合金化合物 恒电位电解 镍电极 |
| 基金项目: 国家自然科学基金;高校基金;国家重点基础研究发展计划 |
| Abstract: The electrochemical behavior of Ho(III) in the LiCl-KCl eutectic melts and the alloying mechanism of Ho-Ni alloys were investigated by cyclic voltammetry, square wave voltammetry and open circuit chronopotentiometry. On a W electrode, the electroreduction of Ho(III) proceeds in a one-step process involving three electrons at -2.06 V (vs Ag/AgCl). Compared with the cyclic voltammograms on an inert W electrode, three reduction peaks are observed which indicates the under-potential deposition of Ho(III) on the reactive Ni electrode due to the formation of Ho–Ni intermetallic compounds. Three alloy samples were produced by potentiostatic electrolysis at various potentials and characterized by X-ray diffraction (XRD), scanning electron microscopy and energy dispersive spectrometer ((SEM-EDS), respectively. The results confirmed the three alloy samples are Ho2Ni17, HoNi5 and HoNi2 intermetallic compounds, respectively. |
| Keywords: Electrochemical formation Ho-Ni intermetallic compounds Potentionstatic electrolysis LiCl-KCl melts |
| 投稿时间：2014-06-30 修订日期：2014-10-08 |
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