ELECTROMICROGRAVIMETRIC STUDY OF THALLIUM UNDER POTENTIAL DEPOSITS ON GOLD IN ACID MEDIUM

A study of underpotential deposits (UPD) of Tl/Au was carried out by coupling microgravimetry to cyclic voltammetry in acid perchlorate medium. In the first place, it was found that in the potential region positive to UPD formation of thallium on gold, the recorded frequency did not vary, thus imply...

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Autores principales:	MONTES-ROJAS,A, CHAINET,E
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2007
Materias:	underpotential deposition thallium gold electromicrogravimetry
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072007000200003
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spelling	oai:scielo:S0717-970720070002000032007-09-13ELECTROMICROGRAVIMETRIC STUDY OF THALLIUM UNDER POTENTIAL DEPOSITS ON GOLD IN ACID MEDIUMMONTES-ROJAS,ACHAINET,E underpotential deposition thallium gold electromicrogravimetry A study of underpotential deposits (UPD) of Tl/Au was carried out by coupling microgravimetry to cyclic voltammetry in acid perchlorate medium. In the first place, it was found that in the potential region positive to UPD formation of thallium on gold, the recorded frequency did not vary, thus implying that the adsorption of perchlorate anions does not take place before the formation of a metallic monolayer. In the second place, adsorption isotherms prepared from these systems presented similar forms to those appearing when using single-crystal electrodes of Au(111) from the literature. Besides, our results showed that the adsorption of this metal on gold substrates involves species that completely transfer their charge in accordance with the models existing in the literature. Studies performed during the time passed at the cathodic limit of the voltammogram show that there is no formation of any alloyed phase or of 2D phases in the underpotential region. Finally, a monolayer-equivalent charge was determined to be higher than the theoretical, which seems to show that, on the microscopic level, the roughness has a determinant role in the interpretation of these resultsinfo:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.52 n.2 20072007-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072007000200003en10.4067/S0717-97072007000200003
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	underpotential deposition thallium gold electromicrogravimetry
spellingShingle	underpotential deposition thallium gold electromicrogravimetry MONTES-ROJAS,A CHAINET,E ELECTROMICROGRAVIMETRIC STUDY OF THALLIUM UNDER POTENTIAL DEPOSITS ON GOLD IN ACID MEDIUM
description	A study of underpotential deposits (UPD) of Tl/Au was carried out by coupling microgravimetry to cyclic voltammetry in acid perchlorate medium. In the first place, it was found that in the potential region positive to UPD formation of thallium on gold, the recorded frequency did not vary, thus implying that the adsorption of perchlorate anions does not take place before the formation of a metallic monolayer. In the second place, adsorption isotherms prepared from these systems presented similar forms to those appearing when using single-crystal electrodes of Au(111) from the literature. Besides, our results showed that the adsorption of this metal on gold substrates involves species that completely transfer their charge in accordance with the models existing in the literature. Studies performed during the time passed at the cathodic limit of the voltammogram show that there is no formation of any alloyed phase or of 2D phases in the underpotential region. Finally, a monolayer-equivalent charge was determined to be higher than the theoretical, which seems to show that, on the microscopic level, the roughness has a determinant role in the interpretation of these results
author	MONTES-ROJAS,A CHAINET,E
author_facet	MONTES-ROJAS,A CHAINET,E
author_sort	MONTES-ROJAS,A
title	ELECTROMICROGRAVIMETRIC STUDY OF THALLIUM UNDER POTENTIAL DEPOSITS ON GOLD IN ACID MEDIUM
title_short	ELECTROMICROGRAVIMETRIC STUDY OF THALLIUM UNDER POTENTIAL DEPOSITS ON GOLD IN ACID MEDIUM
title_full	ELECTROMICROGRAVIMETRIC STUDY OF THALLIUM UNDER POTENTIAL DEPOSITS ON GOLD IN ACID MEDIUM
title_fullStr	ELECTROMICROGRAVIMETRIC STUDY OF THALLIUM UNDER POTENTIAL DEPOSITS ON GOLD IN ACID MEDIUM
title_full_unstemmed	ELECTROMICROGRAVIMETRIC STUDY OF THALLIUM UNDER POTENTIAL DEPOSITS ON GOLD IN ACID MEDIUM
title_sort	electromicrogravimetric study of thallium under potential deposits on gold in acid medium
publisher	Sociedad Chilena de Química
publishDate	2007
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072007000200003
work_keys_str_mv	AT montesrojasa electromicrogravimetricstudyofthalliumunderpotentialdepositsongoldinacidmedium AT chainete electromicrogravimetricstudyofthalliumunderpotentialdepositsongoldinacidmedium
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ELECTROMICROGRAVIMETRIC STUDY OF THALLIUM UNDER POTENTIAL DEPOSITS ON GOLD IN ACID MEDIUM

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