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

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 th...

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Detalles Bibliográficos
Autores principales:	Salvarezza, Roberto Carlos, Arvia, Alejandro Jorge
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	1988
Materias:	Ciencias Exactas Química Mercury electrodeposition Platinum electrodes
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/119241
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-119241
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 Mercury electrodeposition Platinum electrodes
spellingShingle	Ciencias Exactas Química Mercury electrodeposition Platinum electrodes Salvarezza, Roberto Carlos Arvia, Alejandro Jorge Complex processes related to the early stages of mercury electrodeposition on Pt electrodes
topic_facet	Ciencias Exactas Química Mercury electrodeposition Platinum electrodes
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.
format	Articulo Articulo
author	Salvarezza, Roberto Carlos Arvia, Alejandro Jorge
author_facet	Salvarezza, Roberto Carlos Arvia, Alejandro Jorge
author_sort	Salvarezza, Roberto Carlos
title	Complex processes related to the early stages of mercury electrodeposition on Pt 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
publishDate	1988
url	http://sedici.unlp.edu.ar/handle/10915/119241
work_keys_str_mv	AT salvarezzarobertocarlos complexprocessesrelatedtotheearlystagesofmercuryelectrodepositiononptelectrodes AT arviaalejandrojorge complexprocessesrelatedtotheearlystagesofmercuryelectrodepositiononptelectrodes
bdutipo_str	Repositorios
_version_	1764820448041762817

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

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