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

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 ov...

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Detalles Bibliográficos
Autores principales: Triaca, Walter Enrique, Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 1965
Materias:
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/121861
Aporte de:
id I19-R120-10915-121861
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
Kinetics
Electrolysis
Anodic overpotential
spellingShingle Ciencias Exactas
Química
Kinetics
Electrolysis
Anodic overpotential
Triaca, Walter Enrique
Arvia, Alejandro Jorge
Kinetics of the anodic reaction occurring during the electrolysis of molten nitrates on platinum electrodes at different temperatures
topic_facet Ciencias Exactas
Química
Kinetics
Electrolysis
Anodic overpotential
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.
format Articulo
Articulo
author Triaca, Walter Enrique
Arvia, Alejandro Jorge
author_facet Triaca, Walter Enrique
Arvia, Alejandro Jorge
author_sort Triaca, Walter Enrique
title Kinetics of the anodic reaction occurring during the electrolysis of molten nitrates on platinum electrodes at different temperatures
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
publishDate 1965
url http://sedici.unlp.edu.ar/handle/10915/121861
work_keys_str_mv AT triacawalterenrique kineticsoftheanodicreactionoccurringduringtheelectrolysisofmoltennitratesonplatinumelectrodesatdifferenttemperatures
AT arviaalejandrojorge kineticsoftheanodicreactionoccurringduringtheelectrolysisofmoltennitratesonplatinumelectrodesatdifferenttemperatures
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