Modeling of electrochemical interfaces from an experimental viewpoint.
Speaker: Anja Bieberle (DIFFER)
Time: Apr. 18, 2019, 10:00–11:00
Location: Differ, Alexander-zaal
Electrochemical interfaces are the heart of many alternative, sustainable energy applications. They are determining the efficiency and the overall performance. However, in most cases we do not know what processes take place at the interface and which processes are limiting the performance. Experimental electrochemical measurement methods cannot measure mechanisms or species directly. Analysis methods, such as equivalent circuit fitting for electrochemical impedance data, do not allow to link the electrochemistry directly to the measurement data.
In this talk, we introduce the audience to this dilemma with the case study of photo-electrochemical water splitting. We show most recent electrochemical, experimental results on metal oxide – electrolyte interfaces and show the limitations of experimental studies in analyzing the limiting processes at the interface. We then introduce our new modeling approach that allows us simulating electrochemical data (current – voltage, electrochemical impedance) directly from an electrochemical model. We compare the simulated, electrochemical data to experimental data and show that we can even simulate data which is experimentally not available, but highly desired.