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SERS investigation of the adsorption and electroreduction of 4-cyanopyridine on a silver electrode by Chongtie Shi; Wei Zhang; Ronald L. Birke; John R. Lombardi is a Engineering article available to read on EtoBox.

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Time-resolved surface-enhanced Raman scattering (TR-SERS) has been used to study the adsorption and reduction of 4-cyanopyridine (4-CNPY) in non-buffered 0. I M KCi aqueous solutions on an Ag electrode. At electrode potentials of -0.1 to -0.6 V vs. SCE, well before the reduction process occurs, the nature of the adsorbed species depends on both the solution concentration and the time following an oxidation-reduction process. At 20.0 mM 4-CNPY a dimer or aggregated surface species which forms dynamically on the surface is deduced from the SERS spectra, whereas at 1.0 mM and below a monomer species oriented vertically to the surface and attached end-on through the ring nitrogen is deduced. A pump-probe TR-SERS method with an applied potential pump and a CW 488 nm optical probe was used to investigate the electrode potential region where the reduction process occurred, > -1.2 V vs. SCE. In the more dilute solutions, SERS spectra showed that pyridine and CN-are the products of the electrode reaction, whereas at concentrations of 10mM and above the TR-SERS spectra indicated that a bimolecular reaction occurred with the most likely product being azo-4-methylpyridine. Rate constants for r

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Author

Chongtie Shi; Wei Zhang; Ronald L. Birke; John R. Lombardi

Publisher

Elsevier ; Elsevier BV (ISSN 1572-6657)

Published

1997

Language

EN

Field

Engineering (Physical Sciences)