In Situ Atomic Force Microscopic Studies of the Interfacial Multilayer Nanostructure of LiTFSI–[Py1, 4]TFSI on Au(111): Influence of Li+ Ion Concentration on the Au(111)/IL Interface
In Situ Atomic Force Microscopic Studies of the Interfacial Multilayer Nanostructure of LiTFSI–[Py1, 4]TFSI on Au(111): Influence of Li+ Ion Concentration on the Au(111)/IL Interface
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DOI：
10.1021/acs.jpcc.5b04562
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发表时间：
2015-07
影响因子：
3.7
通讯作者：
A. Lahiri;T. Carstens;R. Atkin;N. Borisenko;F. Endres
中科院分区：
文献类型：
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作者：
A. Lahiri;T. Carstens;R. Atkin;N. Borisenko;F. Endres
本文采用循环伏安法和原子力显微镜（AFM）研究了LiTFSI-[Py 1，4]TFSI与Au（111）的纳米级相互作用。拉曼光谱用于理解Li+离子与TFSI-离子的配位，并且显示随着[Py 1，4]TFSI中LiTFSI浓度的增加，Li+离子溶剂化结构显著改变。相应地，AFM中的力-距离曲线显示，在较低浓度的LiTFSI（0.1M）下获得多层结构。在增加的浓度LiTFSI（0.5和1 M），观察到的界面层的数量显着减少。随着电位的变化，发现界面层随破裂层所需的力的增加而变化。本研究清楚地表明，Li+离子改变了离子液体/Au（111）界面，并可以提供洞察离子液体基锂电池的界面过程。
In this paper, we present results on the nanoscale interactions of LiTFSI–[Py1, 4]TFSI with Au(111) using cyclic voltammetry and atomic force microscopy (AFM). Raman spectroscopy was used to understand the Li+ ion coordination with the TFSI– ion and showed that with increase in LiTFSI concentration in [Py1, 4]TFSI, the Li+ ion solvation structure significantly changes. Correspondingly, the force–distance profile in AFM revealed that at lower concentrations of LiTFSI (0.1 M) a multilayered structure is obtained. On increasing the concentration of LiTFSI (0.5 and 1 M), a significant decrease in the number of interfacial layers was observed. With change in the potential, the interfacial layers were found to vary with an increase in the force required to rupture the layers. The present study clearly shows that Li+ ions vary the ionic liquid/Au(111) interface and could provide insight into the interfacial processes in ionic liquid based lithium batteries.