In situ scanning tunneling microscopy (STM), atomic force microscopy (AFM) and quartz crystal microbalance (EQCM) studies of the electrochemical deposition of tantalum in two different ionic liquids with the 1-butyl-1-methylpyrrolidinium cation
In situ scanning tunneling microscopy (STM), atomic force microscopy (AFM) and quartz crystal microbalance (EQCM) studies of the electrochemical deposition of tantalum in two different ionic liquids with the 1-butyl-1-methylpyrrolidinium cation
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DOI：
10.1016/j.electacta.2015.07.178
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发表时间：
2016-04-10
影响因子：
6.6
通讯作者：
Endres, Frank
中科院分区：
文献类型：
--
作者：
Carstens, Timo;Ispas, Adriana;Endres, Frank
0.1M TaF_5在两种疏水性离子液体中的电化学还原（1-丁基-1-甲基吡咯烷鎓三（五氟乙基）三氟磷酸盐（[Py-1，Py-4] FAP）和1-丁基-1-甲基吡咯烷鎓双（三氟甲磺酰基）酰胺使用三种原位技术探测（[Py-1，Py-4] TFSA）：扫描隧道显微镜（STM）、原子力显微镜（AFM）和电化学石英晶体微天平（EQCM）。这些技术表明，在类似的条件下，TaF 5在含有[TFSA]阴离子的液体中比在含有[FAP]阴离子的液体中更容易被还原。提高温度降低了离子液体的粘度和密度，这有利于TaF 5的电还原，特别是在[Py-1，Py-4] TFSA中。对于含有和不含有TaF 5的离子液体，STM观察到Au电极的人字形重建。扫描隧道显微镜（STM）和EQCM证实了[Py-1，Py-4] TFSA中Ta的沉积。通过从[TFSA]离子液体直接电镀获得内部捕获有离子液体的破裂层。在具有[FAP]阴离子的液体中不能获得含Ta的沉积物。(C)2015爱思唯尔有限公司版权所有。
The electrochemical reduction of 0.1 M TaF5 in two hydrophobic ionic liquids (1-butyl-1-methylpyrrolidinium tris(pentafluoroethyl) trifluorophosphate ([Py-1,Py-4] FAP) and 1-butyl-1-methylpyrrolidinium bis (trifluoromethylsulfonyl) amide ([Py-1,Py-4] TFSA) is probed using three in situ techniques: scanning tunneling microscopy (STM), atomic force microscopy (AFM), and electrochemical quartz crystal microbalance (EQCM). These techniques reveal that under similar conditions TaF5 is more easily reduced in the liquids with [TFSA] than [FAP] anions. Increasing the temperature reduced the viscosity and density of the ionic liquids which facilitates TaF5 electroreduction, in particular, in [Py-1,Py-4] TFSA. A herringbone reconstruction of the Au electrode was observed by STM for both ionic liquids with and without TaF5. Ta deposition was proved by STM and EQCM in [Py-1,Py-4] TFSA. Cracked layers, with ionic liquid trapped inside, were obtained by direct plating from the [TFSA] ionic liquid. No Ta containing deposits could be obtained in the liquid with the [FAP] anion. (C) 2015 Elsevier Ltd. All rights reserved.