Adsorption of 1,10-Phenanthroline in HClO<sub>4</sub> Solutions on Columnar-Structured Gold Electrodes : The Excluded Volume Effect

The electroadsorption of 1,10-phenanthroline on columnar Au electrodes from x M 1,10-phenanthroline + 0.1 M HClO<sub>4</sub> aqueous solutions (5 × 10<sup>-4</sup> ≤ x ≤ 5 × 10<sup>-3</sup>), at constant potential and 298 K, was studied using voltammetry, chronoco...

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Autores principales: Gómez, M. M., García, M. P., San Fabián, J., Vázquez, L., Salvarezza, Roberto Carlos, Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 1996
Materias:
Ciencias Informáticas
Electroadsorption
Gold Electrodes
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/119096
https://pubs.acs.org/doi/10.1021/la950079z
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-119096
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Informáticas
Electroadsorption
Gold Electrodes
spellingShingle Ciencias Informáticas
Electroadsorption
Gold Electrodes
Gómez, M. M.
García, M. P.
San Fabián, J.
Vázquez, L.
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
Adsorption of 1,10-Phenanthroline in HClO<sub>4</sub> Solutions on Columnar-Structured Gold Electrodes : The Excluded Volume Effect
topic_facet Ciencias Informáticas
Electroadsorption
Gold Electrodes
description The electroadsorption of 1,10-phenanthroline on columnar Au electrodes from x M 1,10-phenanthroline + 0.1 M HClO<sub>4</sub> aqueous solutions (5 × 10<sup>-4</sup> ≤ x ≤ 5 × 10<sup>-3</sup>), at constant potential and 298 K, was studied using voltammetry, chronocoulometry, and ac impedance combined with scanning tunneling microscopy to characterize the substrate topography. The roughness factor (R) was defined as the ratio of the O-adatom monolayer electrodesorption charge at the columnar Au electrode to that at the initial smooth Au electrode. When both R and the molar 1,10-phenanthroline concentration (c) were kept constant, the degree of surface coverage by 1,10-phenanthroline (θ) diminished as R was increased. The θ vs c plots, irrespective of R, were interpreted by a Frumkin adsorption isotherm including a constant standard adsorption free energy. The analysis of parameters derived from adsorption isotherms reflects the existence of an excluded volume effect, as should be expected from the 1,10-phenanthroline molecule adsorption cross section, and the size of the smallest voids and crevices at the substrate determined by scanning tunneling microscopy.
format Articulo
Articulo
author Gómez, M. M.
García, M. P.
San Fabián, J.
Vázquez, L.
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_facet Gómez, M. M.
García, M. P.
San Fabián, J.
Vázquez, L.
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_sort Gómez, M. M.
title Adsorption of 1,10-Phenanthroline in HClO<sub>4</sub> Solutions on Columnar-Structured Gold Electrodes : The Excluded Volume Effect
title_short Adsorption of 1,10-Phenanthroline in HClO<sub>4</sub> Solutions on Columnar-Structured Gold Electrodes : The Excluded Volume Effect
title_full Adsorption of 1,10-Phenanthroline in HClO<sub>4</sub> Solutions on Columnar-Structured Gold Electrodes : The Excluded Volume Effect
title_fullStr Adsorption of 1,10-Phenanthroline in HClO<sub>4</sub> Solutions on Columnar-Structured Gold Electrodes : The Excluded Volume Effect
title_full_unstemmed Adsorption of 1,10-Phenanthroline in HClO<sub>4</sub> Solutions on Columnar-Structured Gold Electrodes : The Excluded Volume Effect
title_sort adsorption of 1,10-phenanthroline in hclo<sub>4</sub> solutions on columnar-structured gold electrodes : the excluded volume effect
publishDate 1996
url http://sedici.unlp.edu.ar/handle/10915/119096
https://pubs.acs.org/doi/10.1021/la950079z
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