Kinetics of oxygen formation and dissolution on platinum electrodes in the electrolysis of molten potassium bisulphate

Autores
Arvia, Alejandro Jorge; Calandra, Alfredo J.; Videla, Héctor A.
Año de publicación
1968
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The kinetics of electrochemical formation and dissolution of oxygen in the electrolysis of molten potassium bisulphate in the temperature range of ca 230–330°C has been studied. The potentiostatic and galvanostatic polarization curves at high overvoltages fit a Tafel equation. The anodic slope is RT/F, and the cathodic slope RT/2F. At low anodic overvoltages oxide-film formation seems to occur on the platinum. In the cathodic overvoltage region dissolution of oxygen occurs with a well defined limiting cd related to the amount of oxygen dissolved in the melt. Non-steady measurements for the anodic reaction yield kinetic parameters which coincide with those obtained from polarization curves. Experimental capacitances have reasonable low values. Anodic results are discussed in terms of the discharge of sulphate or bisulphate ions on a totally oxidized platinum surface, the rate-determining step being a two-electron transfer. The cathodic reactions comprise a diffusion process related to oxygen dissolution and the already known electrochemical formation of hydrogen.
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas
Materia
Ciencias Exactas
Química
Kinetics
Oxygen
Molten potassium bisulphate
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:10915/121843
Acceder
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oai_identifier_str oai:sedici.unlp.edu.ar:10915/121843
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Kinetics of oxygen formation and dissolution on platinum electrodes in the electrolysis of molten potassium bisulphateArvia, Alejandro JorgeCalandra, Alfredo J.Videla, Héctor A.Ciencias ExactasQuímicaKineticsOxygenMolten potassium bisulphateThe kinetics of electrochemical formation and dissolution of oxygen in the electrolysis of molten potassium bisulphate in the temperature range of ca 230–330°C has been studied. The potentiostatic and galvanostatic polarization curves at high overvoltages fit a Tafel equation. The anodic slope is RT/F, and the cathodic slope RT/2F. At low anodic overvoltages oxide-film formation seems to occur on the platinum. In the cathodic overvoltage region dissolution of oxygen occurs with a well defined limiting cd related to the amount of oxygen dissolved in the melt. Non-steady measurements for the anodic reaction yield kinetic parameters which coincide with those obtained from polarization curves. Experimental capacitances have reasonable low values. Anodic results are discussed in terms of the discharge of sulphate or bisulphate ions on a totally oxidized platinum surface, the rate-determining step being a two-electron transfer. The cathodic reactions comprise a diffusion process related to oxygen dissolution and the already known electrochemical formation of hydrogen.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/pdf167-182http://sedici.unlp.edu.ar/handle/10915/121843enginfo:eu-repo/semantics/altIdentifier/issn/0013-4686info:eu-repo/semantics/altIdentifier/doi/10.1016/0013-4686(68)80019-2info: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:UNLP2025-09-03T11:01:02Zoai:sedici.unlp.edu.ar:10915/121843Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-03 11:01:03.085SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Kinetics of oxygen formation and dissolution on platinum electrodes in the electrolysis of molten potassium bisulphate
title Kinetics of oxygen formation and dissolution on platinum electrodes in the electrolysis of molten potassium bisulphate
spellingShingle Kinetics of oxygen formation and dissolution on platinum electrodes in the electrolysis of molten potassium bisulphate
Arvia, Alejandro Jorge
Ciencias Exactas
Química
Kinetics
Oxygen
Molten potassium bisulphate
title_short Kinetics of oxygen formation and dissolution on platinum electrodes in the electrolysis of molten potassium bisulphate
title_full Kinetics of oxygen formation and dissolution on platinum electrodes in the electrolysis of molten potassium bisulphate
title_fullStr Kinetics of oxygen formation and dissolution on platinum electrodes in the electrolysis of molten potassium bisulphate
title_full_unstemmed Kinetics of oxygen formation and dissolution on platinum electrodes in the electrolysis of molten potassium bisulphate
title_sort Kinetics of oxygen formation and dissolution on platinum electrodes in the electrolysis of molten potassium bisulphate
dc.creator.none.fl_str_mv Arvia, Alejandro Jorge
Calandra, Alfredo J.
Videla, Héctor A.
author Arvia, Alejandro Jorge
author_facet Arvia, Alejandro Jorge
Calandra, Alfredo J.
Videla, Héctor A.
author_role author
author2 Calandra, Alfredo J.
Videla, Héctor A.
author2_role author
author
dc.subject.none.fl_str_mv Ciencias Exactas
Química
Kinetics
Oxygen
Molten potassium bisulphate
topic Ciencias Exactas
Química
Kinetics
Oxygen
Molten potassium bisulphate
dc.description.none.fl_txt_mv The kinetics of electrochemical formation and dissolution of oxygen in the electrolysis of molten potassium bisulphate in the temperature range of ca 230–330°C has been studied. The potentiostatic and galvanostatic polarization curves at high overvoltages fit a Tafel equation. The anodic slope is RT/F, and the cathodic slope RT/2F. At low anodic overvoltages oxide-film formation seems to occur on the platinum. In the cathodic overvoltage region dissolution of oxygen occurs with a well defined limiting cd related to the amount of oxygen dissolved in the melt. Non-steady measurements for the anodic reaction yield kinetic parameters which coincide with those obtained from polarization curves. Experimental capacitances have reasonable low values. Anodic results are discussed in terms of the discharge of sulphate or bisulphate ions on a totally oxidized platinum surface, the rate-determining step being a two-electron transfer. The cathodic reactions comprise a diffusion process related to oxygen dissolution and the already known electrochemical formation of hydrogen.
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas
description The kinetics of electrochemical formation and dissolution of oxygen in the electrolysis of molten potassium bisulphate in the temperature range of ca 230–330°C has been studied. The potentiostatic and galvanostatic polarization curves at high overvoltages fit a Tafel equation. The anodic slope is RT/F, and the cathodic slope RT/2F. At low anodic overvoltages oxide-film formation seems to occur on the platinum. In the cathodic overvoltage region dissolution of oxygen occurs with a well defined limiting cd related to the amount of oxygen dissolved in the melt. Non-steady measurements for the anodic reaction yield kinetic parameters which coincide with those obtained from polarization curves. Experimental capacitances have reasonable low values. Anodic results are discussed in terms of the discharge of sulphate or bisulphate ions on a totally oxidized platinum surface, the rate-determining step being a two-electron transfer. The cathodic reactions comprise a diffusion process related to oxygen dissolution and the already known electrochemical formation of hydrogen.
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/10915/121843
url http://sedici.unlp.edu.ar/handle/10915/121843
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(68)80019-2
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
167-182
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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