Structure and Dynamics of the Interfacial Layers between Ionic Liquids and Metal Electrodes

离子液体(ILS)与电极材料之间的界面层的结构和动力学在电化学储能和转换以及电化学金属沉积等领域有着重要的应用。基于我们最近在这一领域的工作，我们计划研究IL/电极界面的新方面，并推进新的实验发展。一个重要的方面是零电荷电势(PZC)的确定。就基于IL的电解液而言，几乎没有任何系统的PZC研究。人们熟知的水溶液电化学方法将被测试、修改和改进。此外，我们还计划研究界面层对离子液体中简单氧化还原电偶电荷转移动力学的影响。当已知的二茂铁和钴基氧化还原对被给电子和吸电子基团取代时，可以在典型离子液体的大部分电化学窗口中测量到氧化还原动力学。在这个项目中，我们还将为特高压电化学奠定基础。为此，将采用蒸发技术在金属电极上沉积超纯IL膜。最后，我们计划研究溶解盐对IL/金属界面的影响，以及IL/碳界面的结构和动力学，后者与超级电容器的应用相关。

The structure and dynamics of the interfacial layer between ionic liquids (ILs) and electrode materials play an important role for many applications in the fields of electrochemical energy storage and conversion as well as electrochemical metal deposition. Based on our recent work in this field, we plan to study new aspects of the IL/electrode interface and to advance new experimental developments. One important aspect is the determination of the potential of zero charge (PZC). In the case of IL-based electrolytes, there are hardly any systematic PZC studies. Well-known methods from aqueous electrochemistry will be tested, modified and improved. Furthermore, we plan to study the influence of the interfacial layer on the charge transfer kinetics of simple redox couples in ILs. When well-known ferrocene- and cobaltocene-based redox couples are substituted with electron donating and electron withdrawing groups, redox kinetics in a large part of the electrochemical window of typical ILs can be measured. In this project, we will also set fundamentals for UHV electrochemistry. To this end, ultrapure IL films will be deposited on metal electrode by means of evaporation techniques. Finally, we plan to study the influence of dissolved salts on IL/metal interfaces as well as the structure and dynamics of IL/carbon interfaces, the latter being relevant for supercapacitor applications.