Institute of Experimental and Applied Physics, Kiel University, Olshausenstrasse 40, 24098 Kiel (Germany).
Angew Chem Int Ed Engl. 2015 May 11;54(20):6062-6. doi: 10.1002/anie.201501715. Epub 2015 Apr 27.
Room-temperature ionic liquids are of great current interest for electrochemical applications in material and energy science. Essential for understanding the electrochemical reactivity of these systems are detailed data on the structure and dynamics of the interfaces between these compounds and metal electrodes, which distinctly differ from those in traditional electrolytes. In situ studies are presented of Au(111) electrodes in 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([BMP][TFSA]) by high-speed scanning tunneling microscopy (video-STM). [BMP][TFSA] is one of the best-understood air and water stable ionic liquids. The measurements provide direct insights into the potential-dependent molecular arrangement and surface dynamics of adsorbed BMP cations in the innermost layer on the negatively charged Au electrode surface. In particular, two distinct subsequent transitions in the adlayer structure and lateral mobility are observed with decreasing potential.
室温离子液体在材料和能源科学中的电化学应用中具有重要的当前意义。要理解这些系统的电化学反应性，就需要详细了解这些化合物与金属电极之间界面的结构和动力学数据，这些数据与传统电解质明显不同。通过高速扫描隧道显微镜（video-STM）对 1-丁基-1-甲基吡咯烷双（三氟甲基磺酰基）亚胺（[BMP][TFSA]）中的 Au(111)电极进行了原位研究。[BMP][TFSA]是研究最透彻的空气稳定和水稳定离子液体之一。这些测量提供了直接的见解，了解吸附在带负电荷的 Au 电极表面最内层中的BMP阳离子在电势依赖性下的分子排列和表面动力学。特别是，随着电势的降低，观察到吸附层结构和横向迁移率的两个明显的后续转变。
