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
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/119096
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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 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articulo http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://sedici.unlp.edu.ar/handle/10915/119096 |
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http://sedici.unlp.edu.ar/handle/10915/119096 |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
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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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