溶剂化离子液体电化学界面研究

溶剂化离子液体具有热稳定性好、不易燃及电导率高等优异的性能。作为超浓电解液，溶剂化离子液体中溶剂分子和离子的存在形式与常规电解液截然不同，从而导致特殊的电化学界面及氧化还原特性。然而，目前对溶剂化离子液体的电化学界面性质仍不清楚，阳离子、阴离子和配体及化学计量比如何影响界面结构及其电位依赖性等规律均缺乏认识。本项目拟选择系列溶剂化离子液体，结合光谱学、探针显微学和电化学方法获得的微观及宏观信息揭示相关规律。具体包括运用拉曼光谱认识阳离子、配体分子及阴离子之间的相互作用；利用原位原子力显微术从微观角度获得界面结构随电位的变化，及电解液分解所形成界面膜的厚度、模量和形貌等信息；并基于电化学技术探究溶剂化离子液体界面微分电容、氧化还原特性及所形成界面膜的性质。本研究有望揭示溶剂化离子液体这一特殊电解液中电极界面的基本规律，推动电化学界面基础理论发展，为溶剂化离子液体的应用提供实验依据和理论指导。

Solvate ionic liquids have the advantages of thermostability, inflammability and high conductivity. As a type of superconcentrated electrolyte, all solvent molecules in solvate ionic liquids are in solvating states, presenting quite different properties from those of conventional molecular solvents. However, the interfacial properties of solvate ionic liquids are still unclear, and the studies on how ligand, cation, anion and concentration affect the interfacial structure and property are still scarcely reported in literature. In this project, we plan to combine optical spectroscopy, probe microscopy and electrochemical methods for better understanding the complicated interfaces. Firstly, we will employ Raman spectroscopy to investigate interactions among cations, ligands and anions in bulk electrolyte; Secondly, atomic force microscopy will be used to obtain information on the interface and the formed interphase including the thickness, modulus and morphology; Thirdly, electrochemical methods will be used to obtain differential capacitance curves and the information on the formed interphase. It is expect that the interfacial structure and properties between electrodes and solvate ionic liquids will be revealed, which benefit the development of the fundamental theory of electrochemical interface and the application of solvate ionic liquids.