Kinetics of the hydrogen electrode reaction on gold in acid sulphate melts

Autores
Arvia, Alejandro Jorge; Vega, Fermín de; Videla, Héctor A.
Año de publicación
1968
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The hydrogen-electrode reaction on gold prepared in different ways has been investigated in molten acid sulphates at temperatures from ca 180 to 345°C. Potentiostatic and galvanostatic measurements under steady conditions were performed and the evolution of the potential of the working electrode when current was switched on and off was recorded. Current/voltage curves followed a Tafel law at cathodic overvoltages higher than 0-050 V. Slopes ranging from RT/2F to about 2RT/F are reported, depending on the preparation of the electrode, temperature and overvoltage region considered. Anodic current/voltage curves exhibit a limiting current. From the linear overvoltage/current region the reaction resistance was estimated for the anodic reaction. The exchange cds calculated from the reaction resistance agree with the values extrapolated from the Tafel lines having a slope RT/2F, if the stoichiometric number involved in the mechanism of the reaction is one. Electrode potential decayed logarithmically with time. Experimental electrode capacitances were evaluated from the time dependence of electrode potential. The hydrogen-electrode reaction is discussed in terms of a mechanism involving a fast hydrogenion discharge followed by a combination reaction as rate-determining step. The behaviour of the hydrogen-electrode reaction on gold in acid sulphate melts resembles that in aqueous acid solutions at ordinary temperatures.
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas
Materia
Química
Ciencias Exactas
Hydrogen-electrode reaction
Gold
Molten acid sulphates
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/121952
Acceder
id SEDICI_0f5cd825d072caad5760a586dc9435b6
oai_identifier_str oai:sedici.unlp.edu.ar:10915/121952
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Kinetics of the hydrogen electrode reaction on gold in acid sulphate meltsArvia, Alejandro JorgeVega, Fermín deVidela, Héctor A.QuímicaCiencias ExactasHydrogen-electrode reactionGoldMolten acid sulphatesThe hydrogen-electrode reaction on gold prepared in different ways has been investigated in molten acid sulphates at temperatures from ca 180 to 345°C. Potentiostatic and galvanostatic measurements under steady conditions were performed and the evolution of the potential of the working electrode when current was switched on and off was recorded. Current/voltage curves followed a Tafel law at cathodic overvoltages higher than 0-050 V. Slopes ranging from RT/2F to about 2RT/F are reported, depending on the preparation of the electrode, temperature and overvoltage region considered. Anodic current/voltage curves exhibit a limiting current. From the linear overvoltage/current region the reaction resistance was estimated for the anodic reaction. The exchange cds calculated from the reaction resistance agree with the values extrapolated from the Tafel lines having a slope RT/2F, if the stoichiometric number involved in the mechanism of the reaction is one. Electrode potential decayed logarithmically with time. Experimental electrode capacitances were evaluated from the time dependence of electrode potential. The hydrogen-electrode reaction is discussed in terms of a mechanism involving a fast hydrogenion discharge followed by a combination reaction as rate-determining step. The behaviour of the hydrogen-electrode reaction on gold in acid sulphate melts resembles that in aqueous acid solutions at ordinary temperatures.Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas1968info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf581-602http://sedici.unlp.edu.ar/handle/10915/121952enginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/0013468668870288?via%3Dihubinfo:eu-repo/semantics/altIdentifier/issn/0013-4686info:eu-repo/semantics/altIdentifier/doi/10.1016/0013-4686(68)87028-8info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International (CC BY 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-10-22T17:09:54Zoai:sedici.unlp.edu.ar:10915/121952Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-10-22 17:09:54.485SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Kinetics of the hydrogen electrode reaction on gold in acid sulphate melts
title Kinetics of the hydrogen electrode reaction on gold in acid sulphate melts
spellingShingle Kinetics of the hydrogen electrode reaction on gold in acid sulphate melts
Arvia, Alejandro Jorge
Química
Ciencias Exactas
Hydrogen-electrode reaction
Gold
Molten acid sulphates
title_short Kinetics of the hydrogen electrode reaction on gold in acid sulphate melts
title_full Kinetics of the hydrogen electrode reaction on gold in acid sulphate melts
title_fullStr Kinetics of the hydrogen electrode reaction on gold in acid sulphate melts
title_full_unstemmed Kinetics of the hydrogen electrode reaction on gold in acid sulphate melts
title_sort Kinetics of the hydrogen electrode reaction on gold in acid sulphate melts
dc.creator.none.fl_str_mv Arvia, Alejandro Jorge
Vega, Fermín de
Videla, Héctor A.
author Arvia, Alejandro Jorge
author_facet Arvia, Alejandro Jorge
Vega, Fermín de
Videla, Héctor A.
author_role author
author2 Vega, Fermín de
Videla, Héctor A.
author2_role author
author
dc.subject.none.fl_str_mv Química
Ciencias Exactas
Hydrogen-electrode reaction
Gold
Molten acid sulphates
topic Química
Ciencias Exactas
Hydrogen-electrode reaction
Gold
Molten acid sulphates
dc.description.none.fl_txt_mv The hydrogen-electrode reaction on gold prepared in different ways has been investigated in molten acid sulphates at temperatures from ca 180 to 345°C. Potentiostatic and galvanostatic measurements under steady conditions were performed and the evolution of the potential of the working electrode when current was switched on and off was recorded. Current/voltage curves followed a Tafel law at cathodic overvoltages higher than 0-050 V. Slopes ranging from RT/2F to about 2RT/F are reported, depending on the preparation of the electrode, temperature and overvoltage region considered. Anodic current/voltage curves exhibit a limiting current. From the linear overvoltage/current region the reaction resistance was estimated for the anodic reaction. The exchange cds calculated from the reaction resistance agree with the values extrapolated from the Tafel lines having a slope RT/2F, if the stoichiometric number involved in the mechanism of the reaction is one. Electrode potential decayed logarithmically with time. Experimental electrode capacitances were evaluated from the time dependence of electrode potential. The hydrogen-electrode reaction is discussed in terms of a mechanism involving a fast hydrogenion discharge followed by a combination reaction as rate-determining step. The behaviour of the hydrogen-electrode reaction on gold in acid sulphate melts resembles that in aqueous acid solutions at ordinary temperatures.
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas
description The hydrogen-electrode reaction on gold prepared in different ways has been investigated in molten acid sulphates at temperatures from ca 180 to 345°C. Potentiostatic and galvanostatic measurements under steady conditions were performed and the evolution of the potential of the working electrode when current was switched on and off was recorded. Current/voltage curves followed a Tafel law at cathodic overvoltages higher than 0-050 V. Slopes ranging from RT/2F to about 2RT/F are reported, depending on the preparation of the electrode, temperature and overvoltage region considered. Anodic current/voltage curves exhibit a limiting current. From the linear overvoltage/current region the reaction resistance was estimated for the anodic reaction. The exchange cds calculated from the reaction resistance agree with the values extrapolated from the Tafel lines having a slope RT/2F, if the stoichiometric number involved in the mechanism of the reaction is one. Electrode potential decayed logarithmically with time. Experimental electrode capacitances were evaluated from the time dependence of electrode potential. The hydrogen-electrode reaction is discussed in terms of a mechanism involving a fast hydrogenion discharge followed by a combination reaction as rate-determining step. The behaviour of the hydrogen-electrode reaction on gold in acid sulphate melts resembles that in aqueous acid solutions at ordinary temperatures.
publishDate 1968
dc.date.none.fl_str_mv 1968
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/10915/121952
url http://sedici.unlp.edu.ar/handle/10915/121952
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/0013468668870288?via%3Dihub
info:eu-repo/semantics/altIdentifier/issn/0013-4686
info:eu-repo/semantics/altIdentifier/doi/10.1016/0013-4686(68)87028-8
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International (CC BY 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International (CC BY 4.0)
dc.format.none.fl_str_mv application/pdf
581-602
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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score 12.982451

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