Kinetics and mechanism of the oxygen electroreduction reaction on faceted platinum electrodes in trifluoromethanesulfonic acid solutions

The kinetics of the oxygen electroreduction reaction (OERR) were investigated on (1 1 1)-type and (1 0 0)-type faceted, and polycrystalline platinum electrodes in aqueous (0.05–1.0)m trifluoromethanesulfonic acid (TFMSA) using the rotating disc and ring-disc electrode techniques at 25°C. Reaction or...

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Autores principales: Zinola Sánchez, Carlos Fernando, Triaca, Walter Enrique, Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 1995
Materias:
Química
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/146747
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-146747
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
spellingShingle Química
Zinola Sánchez, Carlos Fernando
Triaca, Walter Enrique
Arvia, Alejandro Jorge
Kinetics and mechanism of the oxygen electroreduction reaction on faceted platinum electrodes in trifluoromethanesulfonic acid solutions
topic_facet Química
description The kinetics of the oxygen electroreduction reaction (OERR) were investigated on (1 1 1)-type and (1 0 0)-type faceted, and polycrystalline platinum electrodes in aqueous (0.05–1.0)m trifluoromethanesulfonic acid (TFMSA) using the rotating disc and ring-disc electrode techniques at 25°C. Reaction orders with respect to oxygen close to either 1/2 or 1 were found, depending on the TFMSA concentration and platinum surface morphology. At all TFMSA concentrations the formation of H2O2 was enhanced at (1 0 0)-type platinum surfaces. The difference in the electrocatalytic activity of platinum surfaces can be explained through data derived from the OERR formalism proposed by Damjanovicet al. The rate of the direct O2 to H2O electroreduction reaction increased steadily with the cathodic overvoltage irrespective of the platinum surface morphology, whereas a maximum H2O2 formation rate was found at about 0.5 V, depending on the TFMSA concentration. The H2O2 decomposition rate on (1 0 0)-type platinum electrode yielding H2O approached zero within a certain potential range.
format Articulo
Articulo
author Zinola Sánchez, Carlos Fernando
Triaca, Walter Enrique
Arvia, Alejandro Jorge
author_facet Zinola Sánchez, Carlos Fernando
Triaca, Walter Enrique
Arvia, Alejandro Jorge
author_sort Zinola Sánchez, Carlos Fernando
title Kinetics and mechanism of the oxygen electroreduction reaction on faceted platinum electrodes in trifluoromethanesulfonic acid solutions
title_short Kinetics and mechanism of the oxygen electroreduction reaction on faceted platinum electrodes in trifluoromethanesulfonic acid solutions
title_full Kinetics and mechanism of the oxygen electroreduction reaction on faceted platinum electrodes in trifluoromethanesulfonic acid solutions
title_fullStr Kinetics and mechanism of the oxygen electroreduction reaction on faceted platinum electrodes in trifluoromethanesulfonic acid solutions
title_full_unstemmed Kinetics and mechanism of the oxygen electroreduction reaction on faceted platinum electrodes in trifluoromethanesulfonic acid solutions
title_sort kinetics and mechanism of the oxygen electroreduction reaction on faceted platinum electrodes in trifluoromethanesulfonic acid solutions
publishDate 1995
url http://sedici.unlp.edu.ar/handle/10915/146747
work_keys_str_mv AT zinolasanchezcarlosfernando kineticsandmechanismoftheoxygenelectroreductionreactiononfacetedplatinumelectrodesintrifluoromethanesulfonicacidsolutions
AT triacawalterenrique kineticsandmechanismoftheoxygenelectroreductionreactiononfacetedplatinumelectrodesintrifluoromethanesulfonicacidsolutions
AT arviaalejandrojorge kineticsandmechanismoftheoxygenelectroreductionreactiononfacetedplatinumelectrodesintrifluoromethanesulfonicacidsolutions
bdutipo_str Repositorios
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