The surface diffusion of gold atoms on gold electrodes in acid solution and its dependence on the presence of foreign adsorbates

The surface diffusion coefficient (D<sub>s</sub>) of Au atoms in 0.5 M H<sub>2</sub>SO<sub>4</sub> at 298 K has been determined from the time dependence of the surface roughness factor of electrodispersed Au electrodes in 0.5 M H<sub>2</sub>SO<sub&g...

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Detalles Bibliográficos
Autores principales: Alonso, C., Salvarezza, Roberto Carlos, Vara, J. M., Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 1990
Materias:
Ciencias Exactas
Química
surface diffusion
Adsorción
adsorbate
electrodispersed electrodes
Electrodos
Oro
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/79960
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-79960
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
surface diffusion
Adsorción
adsorbate
electrodispersed electrodes
Electrodos
Oro
spellingShingle Ciencias Exactas
Química
surface diffusion
Adsorción
adsorbate
electrodispersed electrodes
Electrodos
Oro
Alonso, C.
Salvarezza, Roberto Carlos
Vara, J. M.
Arvia, Alejandro Jorge
The surface diffusion of gold atoms on gold electrodes in acid solution and its dependence on the presence of foreign adsorbates
topic_facet Ciencias Exactas
Química
surface diffusion
Adsorción
adsorbate
electrodispersed electrodes
Electrodos
Oro
description The surface diffusion coefficient (D<sub>s</sub>) of Au atoms in 0.5 M H<sub>2</sub>SO<sub>4</sub> at 298 K has been determined from the time dependence of the surface roughness factor of electrodispersed Au electrodes in 0.5 M H<sub>2</sub>SO<sub>4</sub>. The value of D<sub>s</sub> for 0.5 M H<sub>2</sub>SO<sub>4</sub> is 5 × 10<sup>−14</sup> cm<sup>2</sup> s<sup>−1</sup>, a figure which depends considerably on the presence of adsorbable species in solution. Thus, the adsorption of pyridine produces a remarkable decrease of D<sub>s</sub>, whereas the adsorption of Cl<sup>−</sup> ion results in the opposite effect. The corresponding values of D<sub>s</sub> are 1.2 × 10<sup>−14</sup> cm<sup>2</sup> s<sup>−1</sup> for 0.5 M H<sub>2</sub>SO<sub>4</sub> + 0.1 M pyridine, and 2.5 × 10<sup>−13</sup> cm<sup>2</sup> s<sup>−1</sup> for 0.5 M H<sub>2</sub>SO<sub>4</sub> + 5 × 10<sup>−4</sup> M KCl. These results are interpreted through the influence of the adsorbate on the Au surface atom diffusion mechanism.
format Articulo
Articulo
author Alonso, C.
Salvarezza, Roberto Carlos
Vara, J. M.
Arvia, Alejandro Jorge
author_facet Alonso, C.
Salvarezza, Roberto Carlos
Vara, J. M.
Arvia, Alejandro Jorge
author_sort Alonso, C.
title The surface diffusion of gold atoms on gold electrodes in acid solution and its dependence on the presence of foreign adsorbates
title_short The surface diffusion of gold atoms on gold electrodes in acid solution and its dependence on the presence of foreign adsorbates
title_full The surface diffusion of gold atoms on gold electrodes in acid solution and its dependence on the presence of foreign adsorbates
title_fullStr The surface diffusion of gold atoms on gold electrodes in acid solution and its dependence on the presence of foreign adsorbates
title_full_unstemmed The surface diffusion of gold atoms on gold electrodes in acid solution and its dependence on the presence of foreign adsorbates
title_sort surface diffusion of gold atoms on gold electrodes in acid solution and its dependence on the presence of foreign adsorbates
publishDate 1990
url http://sedici.unlp.edu.ar/handle/10915/79960
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