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

Autores
Gómez, M. M.; García, M. P.; San Fabián, J.; Vázquez, L.; Salvarezza, Roberto Carlos; Arvia, Alejandro Jorge
Año de publicación
1996
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The electroadsorption of 1,10-phenanthroline on columnar Au electrodes from x M 1,10-phenanthroline + 0.1 M HClO4 aqueous solutions (5 × 10-4 ≤ x ≤ 5 × 10-3), 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.
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas
Materia
Ciencias Informáticas
Electroadsorption
Gold Electrodes
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/119096

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spelling Adsorption of 1,10-Phenanthroline in HClO<sub>4</sub> Solutions on Columnar-Structured Gold Electrodes : The Excluded Volume EffectGómez, M. M.García, M. P.San Fabián, J.Vázquez, L.Salvarezza, Roberto CarlosArvia, Alejandro JorgeCiencias InformáticasElectroadsorptionGold ElectrodesThe 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.Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas1996info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/119096enginfo:eu-repo/semantics/altIdentifier/url/https://pubs.acs.org/doi/10.1021/la950079zinfo:eu-repo/semantics/altIdentifier/issn/0743-7463info:eu-repo/semantics/altIdentifier/issn/1520-5827info:eu-repo/semantics/altIdentifier/doi/10.1021/la950079zinfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:28:04Zoai:sedici.unlp.edu.ar:10915/119096Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:28:04.996SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Adsorption of 1,10-Phenanthroline in HClO<sub>4</sub> Solutions on Columnar-Structured Gold Electrodes : The Excluded Volume Effect
title Adsorption of 1,10-Phenanthroline in HClO<sub>4</sub> Solutions on Columnar-Structured Gold Electrodes : The Excluded Volume Effect
spellingShingle Adsorption of 1,10-Phenanthroline in HClO<sub>4</sub> Solutions on Columnar-Structured Gold Electrodes : The Excluded Volume Effect
Gómez, M. M.
Ciencias Informáticas
Electroadsorption
Gold Electrodes
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
dc.creator.none.fl_str_mv Gómez, M. M.
García, M. P.
San Fabián, J.
Vázquez, L.
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author Gómez, M. M.
author_facet Gómez, M. M.
García, M. P.
San Fabián, J.
Vázquez, L.
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_role author
author2 García, M. P.
San Fabián, J.
Vázquez, L.
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Ciencias Informáticas
Electroadsorption
Gold Electrodes
topic Ciencias Informáticas
Electroadsorption
Gold Electrodes
dc.description.none.fl_txt_mv 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.
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas
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.
publishDate 1996
dc.date.none.fl_str_mv 1996
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info:eu-repo/semantics/publishedVersion
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info:eu-repo/semantics/altIdentifier/issn/0743-7463
info:eu-repo/semantics/altIdentifier/issn/1520-5827
info:eu-repo/semantics/altIdentifier/doi/10.1021/la950079z
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
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rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
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