Complex processes related to the early stages of mercury electrodeposition on Pt electrodes

Autores
Salvarezza, Roberto Carlos; Arvia, Alejandro Jorge
Año de publicación
1988
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The underpotential deposition and early stages of bulk mercury electrodeposition on platinum from aqueous solution containing Hg2+2 ions were studied by using combined potentiostatic and potentiodynamic techniques. The simultaneous electroreduction of the O-containing surface species and the underpotential deposition of Hgsup>2+2 ions render an electrode surface containing an O/Hg atom ratio which depends on both the applied potential and Hgsup>2+2 ion concentration in solution. The nucleation and growth of bulk mercury is impeded by the presence of O-containing surface species, whereas it is markedly enhanced by the presence of Hg-adatoms on the electrode surface. A small number of sites are involved in the nucleation process. Apparently defective points at the UPD Hg layer act as preferred sites for nucleation. It takes potentials more negative than the reversible potential of the Hg/Hgsup>2+2 ion electrode and relatively long electrodeposition times to achieve a degree of surface coverage by mercury atoms greater than 1. It is possible to observe that a fraction of them penetrates into bulk platinum to form a skin-type Hg-Pt alloy.
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas
Materia
Ciencias Exactas
Química
Mercury electrodeposition
Platinum electrodes
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/119241

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network_name_str SEDICI (UNLP)
spelling Complex processes related to the early stages of mercury electrodeposition on Pt electrodesSalvarezza, Roberto CarlosArvia, Alejandro JorgeCiencias ExactasQuímicaMercury electrodepositionPlatinum electrodesThe underpotential deposition and early stages of bulk mercury electrodeposition on platinum from aqueous solution containing Hg<sup>2+</sup><sub>2</sub> ions were studied by using combined potentiostatic and potentiodynamic techniques. The simultaneous electroreduction of the O-containing surface species and the underpotential deposition of Hgsup>2+</sup><sub>2</sub> ions render an electrode surface containing an O/Hg atom ratio which depends on both the applied potential and Hgsup>2+</sup><sub>2</sub> ion concentration in solution. The nucleation and growth of bulk mercury is impeded by the presence of O-containing surface species, whereas it is markedly enhanced by the presence of Hg-adatoms on the electrode surface. A small number of sites are involved in the nucleation process. Apparently defective points at the UPD Hg layer act as preferred sites for nucleation. It takes potentials more negative than the reversible potential of the Hg/Hgsup>2+</sup><sub>2</sub> ion electrode and relatively long electrodeposition times to achieve a degree of surface coverage by mercury atoms greater than 1. It is possible to observe that a fraction of them penetrates into bulk platinum to form a skin-type Hg-Pt alloy.Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas1988info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf1031-1037http://sedici.unlp.edu.ar/handle/10915/119241enginfo:eu-repo/semantics/altIdentifier/issn/0013-4686info:eu-repo/semantics/altIdentifier/doi/10.1016/0013-4686(88)80191-9info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-sa/4.0/Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-10-22T17:09:00Zoai:sedici.unlp.edu.ar:10915/119241Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-10-22 17:09:01.227SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Complex processes related to the early stages of mercury electrodeposition on Pt electrodes
title Complex processes related to the early stages of mercury electrodeposition on Pt electrodes
spellingShingle Complex processes related to the early stages of mercury electrodeposition on Pt electrodes
Salvarezza, Roberto Carlos
Ciencias Exactas
Química
Mercury electrodeposition
Platinum electrodes
title_short Complex processes related to the early stages of mercury electrodeposition on Pt electrodes
title_full Complex processes related to the early stages of mercury electrodeposition on Pt electrodes
title_fullStr Complex processes related to the early stages of mercury electrodeposition on Pt electrodes
title_full_unstemmed Complex processes related to the early stages of mercury electrodeposition on Pt electrodes
title_sort Complex processes related to the early stages of mercury electrodeposition on Pt electrodes
dc.creator.none.fl_str_mv Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author Salvarezza, Roberto Carlos
author_facet Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_role author
author2 Arvia, Alejandro Jorge
author2_role author
dc.subject.none.fl_str_mv Ciencias Exactas
Química
Mercury electrodeposition
Platinum electrodes
topic Ciencias Exactas
Química
Mercury electrodeposition
Platinum electrodes
dc.description.none.fl_txt_mv The underpotential deposition and early stages of bulk mercury electrodeposition on platinum from aqueous solution containing Hg<sup>2+</sup><sub>2</sub> ions were studied by using combined potentiostatic and potentiodynamic techniques. The simultaneous electroreduction of the O-containing surface species and the underpotential deposition of Hgsup>2+</sup><sub>2</sub> ions render an electrode surface containing an O/Hg atom ratio which depends on both the applied potential and Hgsup>2+</sup><sub>2</sub> ion concentration in solution. The nucleation and growth of bulk mercury is impeded by the presence of O-containing surface species, whereas it is markedly enhanced by the presence of Hg-adatoms on the electrode surface. A small number of sites are involved in the nucleation process. Apparently defective points at the UPD Hg layer act as preferred sites for nucleation. It takes potentials more negative than the reversible potential of the Hg/Hgsup>2+</sup><sub>2</sub> ion electrode and relatively long electrodeposition times to achieve a degree of surface coverage by mercury atoms greater than 1. It is possible to observe that a fraction of them penetrates into bulk platinum to form a skin-type Hg-Pt alloy.
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas
description The underpotential deposition and early stages of bulk mercury electrodeposition on platinum from aqueous solution containing Hg<sup>2+</sup><sub>2</sub> ions were studied by using combined potentiostatic and potentiodynamic techniques. The simultaneous electroreduction of the O-containing surface species and the underpotential deposition of Hgsup>2+</sup><sub>2</sub> ions render an electrode surface containing an O/Hg atom ratio which depends on both the applied potential and Hgsup>2+</sup><sub>2</sub> ion concentration in solution. The nucleation and growth of bulk mercury is impeded by the presence of O-containing surface species, whereas it is markedly enhanced by the presence of Hg-adatoms on the electrode surface. A small number of sites are involved in the nucleation process. Apparently defective points at the UPD Hg layer act as preferred sites for nucleation. It takes potentials more negative than the reversible potential of the Hg/Hgsup>2+</sup><sub>2</sub> ion electrode and relatively long electrodeposition times to achieve a degree of surface coverage by mercury atoms greater than 1. It is possible to observe that a fraction of them penetrates into bulk platinum to form a skin-type Hg-Pt alloy.
publishDate 1988
dc.date.none.fl_str_mv 1988
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/10915/119241
url http://sedici.unlp.edu.ar/handle/10915/119241
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0013-4686
info:eu-repo/semantics/altIdentifier/doi/10.1016/0013-4686(88)80191-9
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-sa/4.0/
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-sa/4.0/
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
dc.format.none.fl_str_mv application/pdf
1031-1037
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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