Kinetics of the anodic reaction occurring during the electrolysis of molten nitrates on platinum electrodes at different temperatures

Autores
Triaca, Walter Enrique; Arvia, Alejandro Jorge
Año de publicación
1965
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The kinetics of the anodic reaction occurring during the electrolysis of molten nitrates on bright platinum electrodes has been studied. The kinetic parameters were obtained from conventional current/potential curves, build-up of electrode potential at constant current density and decay of anodic overpotential, working at temperatures between 220 and 470°C. The current density was varied between 1 and 500 mA/cm2. In the region 220–290°C the Tafel slope approaches 2RT/F as given by the current/potential curves, but for decay curves, when overpotential is plotted against log t, two straight line portions, one with slope 2RT/F and the other with slope RT/F were observed. The transition from one straight line to the other occurs abruptly. The exchange current densities for both portions were calculated. These results are explained considering a consecutive scheme of reaction where at least two steps differently dependent on electrode potential can be rate-controlling in the mechanism of reaction. In the range between 350°C and above, the Tafel slope is clearly RT/F, independent of the method of measurement. The exchange current density was also determined and the mechanism of the reaction interpreted in terms of the increase of oxide-ion concentration with temperature and the discharge of these ions on platinum electrodes.
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas
Materia
Ciencias Exactas
Química
Kinetics
Electrolysis
Anodic overpotential
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:10915/121861
Acceder
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oai_identifier_str oai:sedici.unlp.edu.ar:10915/121861
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Kinetics of the anodic reaction occurring during the electrolysis of molten nitrates on platinum electrodes at different temperaturesTriaca, Walter EnriqueArvia, Alejandro JorgeCiencias ExactasQuímicaKineticsElectrolysisAnodic overpotentialThe kinetics of the anodic reaction occurring during the electrolysis of molten nitrates on bright platinum electrodes has been studied. The kinetic parameters were obtained from conventional current/potential curves, build-up of electrode potential at constant current density and decay of anodic overpotential, working at temperatures between 220 and 470°C. The current density was varied between 1 and 500 mA/cm<sup>2</sup>. In the region 220–290°C the Tafel slope approaches 2RT/F as given by the current/potential curves, but for decay curves, when overpotential is plotted against log t, two straight line portions, one with slope 2RT/F and the other with slope RT/F were observed. The transition from one straight line to the other occurs abruptly. The exchange current densities for both portions were calculated. These results are explained considering a consecutive scheme of reaction where at least two steps differently dependent on electrode potential can be rate-controlling in the mechanism of reaction. In the range between 350°C and above, the Tafel slope is clearly RT/F, independent of the method of measurement. The exchange current density was also determined and the mechanism of the reaction interpreted in terms of the increase of oxide-ion concentration with temperature and the discharge of these ions on platinum electrodes.Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas1965info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf409-427http://sedici.unlp.edu.ar/handle/10915/121861enginfo:eu-repo/semantics/altIdentifier/issn/0013-4686info:eu-repo/semantics/altIdentifier/doi/10.1016/0013-4686(65)80058-5info: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:UNLP2025-09-03T11:01:03Zoai:sedici.unlp.edu.ar:10915/121861Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-03 11:01:03.842SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Kinetics of the anodic reaction occurring during the electrolysis of molten nitrates on platinum electrodes at different temperatures
title Kinetics of the anodic reaction occurring during the electrolysis of molten nitrates on platinum electrodes at different temperatures
spellingShingle Kinetics of the anodic reaction occurring during the electrolysis of molten nitrates on platinum electrodes at different temperatures
Triaca, Walter Enrique
Ciencias Exactas
Química
Kinetics
Electrolysis
Anodic overpotential
title_short Kinetics of the anodic reaction occurring during the electrolysis of molten nitrates on platinum electrodes at different temperatures
title_full Kinetics of the anodic reaction occurring during the electrolysis of molten nitrates on platinum electrodes at different temperatures
title_fullStr Kinetics of the anodic reaction occurring during the electrolysis of molten nitrates on platinum electrodes at different temperatures
title_full_unstemmed Kinetics of the anodic reaction occurring during the electrolysis of molten nitrates on platinum electrodes at different temperatures
title_sort Kinetics of the anodic reaction occurring during the electrolysis of molten nitrates on platinum electrodes at different temperatures
dc.creator.none.fl_str_mv Triaca, Walter Enrique
Arvia, Alejandro Jorge
author Triaca, Walter Enrique
author_facet Triaca, Walter Enrique
Arvia, Alejandro Jorge
author_role author
author2 Arvia, Alejandro Jorge
author2_role author
dc.subject.none.fl_str_mv Ciencias Exactas
Química
Kinetics
Electrolysis
Anodic overpotential
topic Ciencias Exactas
Química
Kinetics
Electrolysis
Anodic overpotential
dc.description.none.fl_txt_mv The kinetics of the anodic reaction occurring during the electrolysis of molten nitrates on bright platinum electrodes has been studied. The kinetic parameters were obtained from conventional current/potential curves, build-up of electrode potential at constant current density and decay of anodic overpotential, working at temperatures between 220 and 470°C. The current density was varied between 1 and 500 mA/cm<sup>2</sup>. In the region 220–290°C the Tafel slope approaches 2RT/F as given by the current/potential curves, but for decay curves, when overpotential is plotted against log t, two straight line portions, one with slope 2RT/F and the other with slope RT/F were observed. The transition from one straight line to the other occurs abruptly. The exchange current densities for both portions were calculated. These results are explained considering a consecutive scheme of reaction where at least two steps differently dependent on electrode potential can be rate-controlling in the mechanism of reaction. In the range between 350°C and above, the Tafel slope is clearly RT/F, independent of the method of measurement. The exchange current density was also determined and the mechanism of the reaction interpreted in terms of the increase of oxide-ion concentration with temperature and the discharge of these ions on platinum electrodes.
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas
description The kinetics of the anodic reaction occurring during the electrolysis of molten nitrates on bright platinum electrodes has been studied. The kinetic parameters were obtained from conventional current/potential curves, build-up of electrode potential at constant current density and decay of anodic overpotential, working at temperatures between 220 and 470°C. The current density was varied between 1 and 500 mA/cm<sup>2</sup>. In the region 220–290°C the Tafel slope approaches 2RT/F as given by the current/potential curves, but for decay curves, when overpotential is plotted against log t, two straight line portions, one with slope 2RT/F and the other with slope RT/F were observed. The transition from one straight line to the other occurs abruptly. The exchange current densities for both portions were calculated. These results are explained considering a consecutive scheme of reaction where at least two steps differently dependent on electrode potential can be rate-controlling in the mechanism of reaction. In the range between 350°C and above, the Tafel slope is clearly RT/F, independent of the method of measurement. The exchange current density was also determined and the mechanism of the reaction interpreted in terms of the increase of oxide-ion concentration with temperature and the discharge of these ions on platinum electrodes.
publishDate 1965
dc.date.none.fl_str_mv 1965
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/10915/121861
url http://sedici.unlp.edu.ar/handle/10915/121861
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(65)80058-5
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
409-427
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 13.13397

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