High-resolution and operando analysis for understanding surface and interface processes

Abstract

Function and properties of electrified interfaces are controlled by a complex and concerted competition of specific and unspecific interaction of reactive surfaces with ions and water in an electrolyte. For instance, the local interface structure determines transition state barriers for electrocatalytic reactions and controls electron transfer from a surface toward a solution species, or vice versa. Further, properties such a lubrication and friction are controlled by molecular interfacial structures. Atomic force microscopy techniques provide an unprecedented resolution of complex surface structures, in both gaseous and recently also liquid environments. In this contribution I will dis cuss our understanding of ion exchange processes, and competitive molecular interaction at the interface of Muscovite mica, and will show first results on electrochemical interfaces. Starting from highly resolved data interfacial ion/water adsorption, it is possible to understand an predict competitive adsorption, and to derive quantitative thermodynamic information of molecular interactions at a complex solid/liquid interface. I will show different examples, how molecular resolution studies can provide an understanding of the emerging properties such as friction, reactivity or adhesion at electrified interfaces.