期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 15, 页码 4211-4214出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201612183
关键词
absorption; cyclic voltammetry; electrochemistry; liquids; sum frequency generation
资金
- Deutsche Forschungsgemeinschaft through Collaborative Research Center 658: Elementary Processes in Molecular Switches at Surfaces
Quantitative description of reaction mechanisms in aqueous phase electrochemistry requires experimental characterization of local water structure at the electrode/aqueous interface and its evolution with changing potential. Gaining such insight experimentally under electrochemical conditions is a formidable task. The potential-dependent structure of a sub-population of interfacial water with one OH group pointing towards a gold working electrode is characterized using interface specific vibrational spectroscopy in a thin film electrochemical cell. Such free-OH groups are the molecular level observable of an extended hydrophobic interface. This free-OH interacts only weakly with the Au surface at all potentials, has an orientational distribution that narrows approaching the potential of zero charge, and disappears on oxidation of the gold electrode.
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