| 添加剂对离子液体中电沉积金属钴的影响 |
| Influence of Additive on Electrodeposition of Pure Cobalt from an Ionic Liquid |
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| 摘要: 在含有氯化钴的室温离子液体氯化1-甲基-3-乙基咪唑(EMIC)和乙二醇(EG)体系中，采用扫描电子显微镜(FE-SEM）、阴极极化曲线、循环伏安及X射线衍射等方法研究了添加剂对电沉积金属钴的影响。结果表明，在EMIC-EG-CoCl2熔盐中加入丁炔二醇能够有效地改善钴镀层的外观质量，丁炔二醇的加入量在0.3～0.7 g·L-1范围内，能够得到银灰色、具有金属光泽的良好镀层。从FE-SEM照片可以看出，在EMIC-EG-CoCl2熔盐中加入丁炔二醇后，使金属钴的结晶变得更加细致；阴极极化曲线表明，丁炔二醇的加入不仅增大了阴极极化，而且还消除了钴的欠电势沉积；循环伏安测试证明，添加剂的加入对阴极沉积过程有阻化作用；XRD分析证实，丁炔二醇的加入使金属钴的衍射峰变宽，晶粒尺寸为纳米级。 |
| 关键词: 钴 氯化1-甲基-3-乙基咪唑 离子液体 添加剂 电沉积 |
| 基金项目: |
| Abstract: In a 1-ethyl-3-methylimidazolium chloride(EMIC) ionic liquid and ethylene glycol(EG) containing CoCl2 , some analytic methods studied the influence of additive on electrodeposition of cobalt, such as field emission scanning electron microscope(FE-SEM), cathodic polarization curves, cyclic voltammograms, and X-ray diffraction. The results indicated that the electrodeposits appearance was improved remarkably with the addition of 2-Butyne-1.4-diol into EMIC-CoCl2-EG electrolyte, and smooth and silver gray electrodeposits with metallic luster can be obtained under the quantity range of 2-Butyne-1.4-diol was 0.3～0.7 g·L-1. FE-SEM images of electrodeposits showed that the crystals of metallic cobalt became finer after the addition of 2-Butyne-1.4-diol into EMIC-CoCl2-EG electrolyte. Cathodic polarization curves indicated that the addition of 2-Butyne-1.4-diol not only eliminated the underpotential deposition of cobalt but also increased the cathodic polarization. Cyclic voltammograms tests proved that the additive had inhibitive effects on the process of cathode deposition. X-ray diffraction(XRD) approved that the width of diffraction peaks for Co was increased and the size of crystallite grains was several nanometers, when 2-Butyne-1.4-diol was added into EMIC-CoCl2-EG electrolyte. |
| Keywords: cobalt 1-ethyl-3-methylimidazolium chloride ionic liquid additive electrodeposition |
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| 杨培霞,安茂忠,苏彩娜,王福平.添加剂对离子液体中电沉积金属钴的影响[J].无机化学学报,2009,25(1):112-116. |
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