Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 150, Issue 4, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5047941
Keywords
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Funding
- Max Planck Graduate Center
- Johannes Gutenberg University Mainz (MPGC)
- Alexander von Humboldt Foundation
- MCINN-FEDER (Spain) [CTQ2016-76221-P]
- Emmy Noether Program of the Deutsche Forschungsgemeinschaft [DO1691/1-1]
- Boehringer Ingelheim Foundation
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Infrared spectroscopy is a widely employed analytical tool in (electrochemical) surface science as the spectra contain a wealth of information about the interaction of interfacial adsorbates with their environment. Separating and quantifying individual contributions, for example, of co-adsorbates, the substrate or electric field effects, on the overall spectral response, however, is often non-trivial as the various interactions manifest themselves in similar spectral behavior. Here, we present an experimental approach to differentiate between and quantify potential-induced coverage dependence and field-related Stark effects observed in a sulfate band shift of 93.5 +/- 1.5 cm(-1)/V in electrochemical infrared spectra of the showcase sulfate/Au(111) interface. In combination with a simple linear model equation used to describe the potential-induced peak shift of the sulfate stretch vibration, we determine the coverage dependence contribution to be 15.6 +/- 1.2 cm(1)/theta(SO) and the Stark effect to amount to 75.6 +/- 2.7 cm(1)/V. Our work provides a novel route to gain fundamental insight into interfacial adsorbate interactions in electrochemical surface science. Published under license by AIP Publishing.
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