Influence of a silver salt on the nanostructure of a Au(111)/ionic liquid interface: an atomic force microscopy study and theoretical concepts.
Influence of a silver salt on the nanostructure of a Au(111)/ionic liquid interface: an atomic force microscopy study and theoretical concepts.
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DOI：
10.1039/c7cp08243f
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发表时间：
2018-02
期刊：
影响因子：
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通讯作者：
V. Hoffmann;G. Pulletikurthi;T. Carstens;A. Lahiri;A. Borodin;Max Schammer;Birger Horstmann;A. Latz;F. Endres
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文献类型：
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作者：
V. Hoffmann;G. Pulletikurthi;T. Carstens;A. Lahiri;A. Borodin;Max Schammer;Birger Horstmann;A. Latz;F. Endres
离子液体（ILs）在固体/电解质界面形成多层结构，溶质的加入可以改变这种结构。为此，我们利用原位原子力显微镜研究了1-丁基-1-甲基吡啶鎓二（三氟甲基磺酰基）酰胺（[py1,4]TFSA）中银的浓度对层状的影响。AFM研究表明，Au(111)/电解质界面确实取决于盐的浓度，其中典型的“IL”多层结构仅在相当低浓度的银盐（例如≤200 μM）中保留。然而，在200 μM AgTFSA/[py1,4]TFSA及以上，这种“IL”多层结构受到干扰/变化。在[py1,4]TFSA中，在500 μM AgTFSA中观察到简单的双层结构。此外，发现最内层的宽度依赖于浓度和施加的电极电位。我们的AFM结果表明，溶质浓度对电极/电解质界面的结构有强烈的影响，可以为电极/离子液体界面的电双层结构提供新的见解。我们还引入了半连续统理论来讨论双层结构。
Ionic liquids (ILs) form a multilayered structure at the solid/electrolyte interface, and the addition of solutes can alter it. For this purpose, we have investigated the influence of the silver bis(trifluoromethylsulfonyl)amide (AgTFSA) concentration in 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide ([Py1,4]TFSA) on the layering using in situ atomic force microscopy. AFM investigations revealed that the Au(111)/electrolyte interface indeed depends on the concentration of the salt where a typical " IL" multilayered structure is retained only at quite low concentrations of the silver salt (e.g. ≤200 μM). However, at 200 μM AgTFSA/[Py1,4]TFSA and above this "IL" multilayered structure is disturbed/varied. A simple double layer structure was observed at 500 μM AgTFSA in [Py1,4]TFSA. Furthermore, the widths of the innermost layers have been found to be dependent on the concentration and on the applied electrode potentials. Our AFM results show that the concentration of solutes strongly influences the structure of the electrode/electrolyte interface and can provide new insights into the electrical double layer structure of the electrode/ionic liquid interface. We also introduce a semi-continuum theory to discuss the double layer structure.