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O: Fachverband Oberflächenphysik

O 34: Solid-Liquid Interfaces: Reactions and Electrochemistry - Experiment II

O 34.5: Vortrag

Dienstag, 21. März 2017, 11:45–12:00, HSZ 101

Probing surface electrochemical oxidation of gold by nonlinear optical vibrational spectroscopy — •Yujin Tong, Felix Gerke, Martin Wolf, and R. Kramer Campen — Fritz-Haber-Institut, Abt. Physikalische Chemie, 14195 Berlin, Germany

Electrochemical water splitting on noble metal surface is an important reaction of both fundamental and application interest. It is well known that the bottleneck of this reaction is the poor kinetics for oxygen generation from water oxidation. In spite of years study, the mechanisms in terms of the roles of the thin oxides film that formed on the metal surface before/during oxygen evolution are still inexplicit. One of the main reasons is the lack of molecular level information about the oxide thin film structures. In this study, we investigated the electrochemical oxidation of gold in solutions with different pH by employing surface specific vibrational sum frequency spectroscopy (VSFS). By analyzing the potential dependent behaviors of different types of adsorbed species, we could gain molecular level information regarding the structures and formation mechanisms of gold-oxides. The results of this study will provide essential data toward understanding the oxygen evolution mechanism and may suggest strategies for developing better water splitting catalysts.