In-situ spectroscopic evidence for the adsorption of SO2−4 ions at a copper electrode in sulfuric acid solution

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BROWN, GM
HOPE, GA
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1995
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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

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