Abstract
Polyelectrolyte becomes more and more popular in electrocatalysis. The understanding of electrode/polyelectrolyte interfaces at the molecular level is important for guiding further the polyelectrolyte-based electrocatalysis. Herein, we demonstrate an in-situ surface-enhanced Raman spectroscopic method by using a three-electrode spectroelectrochemical cell towards characterizing the electrode/polyelectrolyte interfaces. The Ag/AgCl and Ag/Ag2O electrodes are used as the reference electrode in the acidic and the alkaline systems, respectively. The working electrode is made of a transparent carbon thin film which loads the electrocatalysts. The applications of this method are demonstrated through the in-situ characterizations of the p-methylthiophenol adsorbed on the Au and Pt and the electrochemical oxidation of Au on polyelectrolyte membranes. The potential-dependent spectral features of these two systems show that this method is a powerful tool for investigating the electrode/polyelectrolyte interfaces in electrocatalysis.
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