从复合离子液体中电沉积制备铱

来源期刊:中国有色金属学报(英文版)2015年第5期

论文作者:钱建刚 殷 英 李 鑫 李铁军

文章页码:1685 - 1691

关键词:复合离子液体;铱;N, N-二甲基乙酰胺;电沉积

Key words:composite ionic liquid; iridium; N, N-dimethylacetamide; electrodeposition

摘    要:为研究复合离子液体中电沉积制备Ir的工艺过程,探讨添加剂N, N-二甲基乙酰胺(DMAC)对BMIC-BMIBF4复合离子液体黏度、电导率及电化学稳定性的影响,分析IrCl3在该复合体系中的电化学行为,并在不同电位下恒电位电沉积Ir层。采用扫描电镜及X射线衍射仪对沉积层形貌及组成进行表征。结果表明:DMAC的加入使复合体系的黏度降低、电导率升高、电化学稳定性提高;金电极上的循环伏安测试表明,Ir3+通过一步还原反应生成单质Ir的过程是受扩散速率控制的不可逆过程,其平均转移系数为0.170,扩散系数为1.096×10-6 cm2/s;SEM显示,在还原峰电位处可以获得较为致密、平整的Ir层,而XRD谱表明Ir层为多晶结构。

Abstract: In order to study the electrodeposition process of iridium in composite ionic liquid, the effects of N, N-dimethylacetamide (DMAC) on the viscosity, conductivity and electrochemical stability of composite ionic liquid BMIC-BMIBF4, as well as the electrochemical behavior of IrCl3 in this system were studied. Iridium (Ir) coatings were deposited at different constant potentials and characterized by SEM and XRD. The results show that the addition of DMAC can evidently decrease the viscosity of the composite system, increase conductivity and improve electrochemical stability of the composite system. Cyclic voltammograms of a Au electrode illustrate that the process controlled by diffusion rate is irreversible with the average charge transfer coefficient of 0.170 and average diffusion coefficient of 1.096×10-6 cm2/s. In addition, SEM image shows that Ir film deposited at the reduction peak potential is dense and even, while XRD pattern shows that Ir deposit is polycrystalline structure.

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