Structure and dynamics ofthe interfacial layer between ionic liquids and electrode materials

离子液体与不同电极材料界面层的结构和动力学在电化学储能和金属沉积等领域的应用中起着重要的作用。然而，到目前为止，无论是对该界面层的实验表征还是对其理论认识都没有达到令人满意的水平。在这个项目中，选择纯度最高的离子液体和选择的电极材料（Pt, Au）之间的界面层将使用不同的实验方法进行分析。首先，电化学阻抗谱方法将与STM和AFM方法相结合。以后还将使用MIES和SFG。目的是区分静电双层形成和吸附过程，后者诱导假电容电荷存储。详细分析了缓慢吸附过程对快速双层动力学的影响。最终，将获得有关温度和溶解锂盐影响的信息。该项目应该提供非常纯净和特性良好的离子液体的可靠数据，从而有助于进一步发展现有的双层/界面层理论。

The structure and dynamics of the interfacial layer between ionic liquids and varying electrode materials plays a major role for applications in the fields of electrochemical energy storage and metal deposition. However, until now neither the experimental characterisation of this interfacial layer nor its theoretical understanding has reached a satisfactory level. In this project, the interfacial layer between selected ionic liquids with highest purity and selected electrode materials (Pt, Au) will be analysed using different experimental methods. At first, the method of electrochemical impedance spectroscopy will be combined with STM and AFM methods. Later on, MIES and SFG will be used in addition. The aim is to distinguish between electrostatic double layer formation and adsorption processes, the latter inducing pseudocapacitive charge storage. The influence of slow adsorption processes on the faster double layer dynamics is to be analysed in detail. Eventually, information about the influence of temperature and dissolved lithium salts will be gained. The project ought to deliver reliable data on very pure and well characterised ionic liquids and thereby contribute to the further development of the existing double layer / interfacial layer theories.