Universiteit Leiden

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This Week’s Discoveries | 20 February 2018

Tuesday 20 February 2018
Niels Bohrweg 2
2333 CA Leiden
De Sitterzaal

First lecture

To be announced

Tjerk Oosterkamp (LION)
Tjerk is professor of experimental physics in the Quantum matter and optics group at LION. His group explores the possibilities to combine magnetic resonance techniques with atomic force microscopy together in a single microscope: the MRI-AFM, also called Magnetic Resonance Force Microscopy (MRFM).
Tjerk is a “jack of all trades” who together with theoretician Hans van Leeuwen also conducts research on the exact mechanism behind ice skating. De Volkskrant published a news item about it during the opening weekend of the Olympics.

Second Lecture

Correlation of surface site formation to nanoisland growth in the electrochemical roughening of Pt(111)

Leon Jacobse (CASC, LIC)
Leon is a PhD student in the Catalysis and Surface Chemistry (CASC) group of Marc Koper. His research focuses on the visualizing the atomic scale stability and dynamics of platinum surfaces under electrochemical conditions. These studies are performed in collaboration with Marcel Rost (Huygens-Kamerlingh Onnes Laboratory)

Electrode degradation, especially under oxidizing conditions, forms an important barrier for the widespread application of platinum electrocatalysts. Repeated oxidation and reduction of platinum electrodes is known to result in irreversible surface structure changes, but over thirty years of research did not yet yield to a conclusive description of this process on the atomic level.
Using a special EC-STM, which is capable of measuring the electrochemical signals simultaneously with imaging the surface, we directly correlate, the evolution of the electrochemical (hydrogen desorption) signal of Pt(111) to the observed roughening of the surface. This correlation allows for the identification of different growth regimes in the overall roughening process. These results present not only an important step forward in understanding the atomic scale process of the electrochemical roughening of Pt(111), but also provide valuable insight in the degradation of industrially relevant platinum nanoparticles, as a large part of their surface is naturally composed out of {111} planes.

This Week's Discoveries

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