Correlation between SERS of Pyridine and Electrochemical Response of Silver Electrodes in Halide-Free Alkaline Solutions

Surface-enhanced Raman scattering (SERS) of pyridine (Py) on Ag electrodes in alkaline solutions free of halide ions was obtained at 25°C as a function of the applied potential. The Ag surface was activated for SERS through repetitive oxidation-reduction cycles (ORC), the effect being dependent on t...

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Autores principales: Temperini, M. L. A., Sala, D., Lacconi, G. I., Gioda, A. S., Macagno, V. A., Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 1988
Materias:
Ciencias Exactas
Química
Silver electrodes
Surface-enhanced Raman scattering
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/119247
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-119247
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Química
Silver electrodes
Surface-enhanced Raman scattering
spellingShingle Ciencias Exactas
Química
Silver electrodes
Surface-enhanced Raman scattering
Temperini, M. L. A.
Sala, D.
Lacconi, G. I.
Gioda, A. S.
Macagno, V. A.
Arvia, Alejandro Jorge
Correlation between SERS of Pyridine and Electrochemical Response of Silver Electrodes in Halide-Free Alkaline Solutions
topic_facet Ciencias Exactas
Química
Silver electrodes
Surface-enhanced Raman scattering
description Surface-enhanced Raman scattering (SERS) of pyridine (Py) on Ag electrodes in alkaline solutions free of halide ions was obtained at 25°C as a function of the applied potential. The Ag surface was activated for SERS through repetitive oxidation-reduction cycles (ORC), the effect being dependent on the electrochemical electrode history. The SERS effect was correlated to the activation for the hydrogen evolution reaction (HER), which can be obtained by means of potentiodynamic as well as potentiostatic procedures. The maximum SERS activity was achieved at potentials near the potential of zero charge (pzc) of polycrystalline Ag and appeared to be related to the maximum observed in the roughness factor vs potential curve. These results can be interpreted through the formation of a new uniform globular overlayer structure on the electroreduced Ag surface, which apparently exhibits a certain degree of preferred crystallographic orientation. Three well-defined potential regions can be distinguished for the complex competitive interactions between H<sub>2</sub>O, OH<sup>-</sup> ion, and Py with the new Ag electrode surface.
format Articulo
Articulo
author Temperini, M. L. A.
Sala, D.
Lacconi, G. I.
Gioda, A. S.
Macagno, V. A.
Arvia, Alejandro Jorge
author_facet Temperini, M. L. A.
Sala, D.
Lacconi, G. I.
Gioda, A. S.
Macagno, V. A.
Arvia, Alejandro Jorge
author_sort Temperini, M. L. A.
title Correlation between SERS of Pyridine and Electrochemical Response of Silver Electrodes in Halide-Free Alkaline Solutions
title_short Correlation between SERS of Pyridine and Electrochemical Response of Silver Electrodes in Halide-Free Alkaline Solutions
title_full Correlation between SERS of Pyridine and Electrochemical Response of Silver Electrodes in Halide-Free Alkaline Solutions
title_fullStr Correlation between SERS of Pyridine and Electrochemical Response of Silver Electrodes in Halide-Free Alkaline Solutions
title_full_unstemmed Correlation between SERS of Pyridine and Electrochemical Response of Silver Electrodes in Halide-Free Alkaline Solutions
title_sort correlation between sers of pyridine and electrochemical response of silver electrodes in halide-free alkaline solutions
publishDate 1988
url http://sedici.unlp.edu.ar/handle/10915/119247
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