Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 45: Poster: Solid-Liquid Interfaces - Structure, Spectroscopy, Reactions and Electrochemistry
O 45.14: Poster
Dienstag, 13. März 2018, 18:15–20:30, Poster A
Electrochemical Roughening of Pt(111) : Surface Site Reactivity — •Leon Jacobse1, Yi-Fan Huang1, Marcel J. Rost2, and Marc T.M. Koper1 — 1Leiden Institute of Chemistry, Leiden University, Leiden, The Netherlands — 2Huygens-Kamerlingh Onnes Laboratory, Leiden University, Leiden, The Netherlands
Most devices that form the basis of an energy sustainable future, rely on platinum electrocatalysts. To optimize the use of this scarce and expensive metal, it is of the utmost importance to understand the catalyst’s degradation on the atomic-scale.
We followed the roughening of Pt(111) upon repeated oxidation and reduction cycles (ORCs), by combining simultaneous cyclic voltammetry and in-situ EC-STM. This approach, together with the long timescale of our experiments, reveals new insights on the roughening process. Within the performed 170 ORCs we observe a continuous increase of the electrode roughness that can be separated into two different growth regimes, each of which exhibits their own correlation with the electrochemically measured number of hydrogen adsorption sites. Comparing the average atomic-scale island structure during the evolution with the disentangled voltammetric signals provides insight into the reactivity of the individual surface sites, like steps, kinks, and corner atoms.
[1] L. Jacobse, Y.-F. Huang, M.T.M. Koper, M.J. Rost, Nature Materials, accepted (2017)