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O: Fachverband Oberflächenphysik

O 45: Solid-Liquid Interfaces II: Reactions and Electrochemistry

O 45.8: Vortrag

Dienstag, 17. März 2020, 12:30–12:45, WIL C107

Chemistry and phase transition of pyridine derivatives on gold electrode probed by vibrational sum frequency generation — Xin Gong, Martin Wolf, R. Kramer Campen, and •Yujin Tong — Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin, Germany

Pyridine and its derivatives are of both practical and fundamental importance in electrochemistry. While the flat to vertical phase transition has been extensively studied and well understood, knowledge on the deprotonation and protonation chemistry at the electrode/solution interface in aqueous solution is still very limited. In the current study, we employed vibrational sum frequency generation (VSFG) to monitor both the structral and chemical evolution of 4-(dimethylamino)pyridine (DMAP) adsorbed on a gold electrode as a function of external bias. Significant spectral changes are observed as a function of the applied bias voltage in the cyclic voltammetry. These features can be unambiguously assigned to the protonation/deprotonation and orientational changes respectively. The information revealed by this study is essential for the application of pyridine derivatives in nanoparticle manipulation, enhancement of CO₂ reduction, formic acid electro-oxidation, etc.