In-situ spectroscopic evidence for the adsorption of SO2−4 ions at a copper electrode in sulfuric acid solution
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HOPE, GA
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Abstract
The adsorption of electrolyte anions and molecules at electrode surfaces has important implications for the dynamic processes occurring at the electrode I electrolyte interface. The interfacial structure is significantly altered by the adsorption of ions and molecules which, in turn, can affect the reaction pathways at the electrode surface. It has recently been reported [1] that the ordering of water molecules, for example, at the electrode I electrolyte interface is very different from that in bulk solution. A thorough understanding of the processes of oxidation and reduction at an electrode in aqueous solution must take into consideration the activity of surface adsorbed species. Consequently, the adsorption of electrolyte anion species at electrode surfaces has received much attention from investigators. We have recently conducted a study of the adsorp tion of soi- and HSO4 ions at a copper electrode in sulfuric acid solution using surface enhanced Raman scattering (SERS) spectroscopy. SERS spectroscopy is an extremely sensitive technique which enables the spectroscopic identification of surface-adsorbed species in situ. Thus SERS should be useful for investigating the adsorption of anions at electrode surfaces in aqueous solution. Preliminary results of this study provide important spectroscopic evidence for the adsorption of sulfate ions at an electrochemically roughened copper electrode in sulfuric acid solution.
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Journal of Electroanalytical Chemistry
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382
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1-Feb
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Chemical sciences