Kinetics and mechanism of the oxygen evolution reaction at oxide-coated Co-Ni amorphous alloy electrodes

Oxygen evolution reaction (o.e.r.) kinetics in NaOH solutions have been studied on both fresh and oxide covered Co50Ni25Si15B10 amorphous alloy (G-16) electrodes. Steady state polarization curves obtained in different aqueous xM NaOH (0.1 ⩽ x ⩽ 4) in the 30–80°C range fulfill Tafel relationships at...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Kessler, Teresita, Triaca, Walter Enrique, Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 1994
Materias:
Ciencias Exactas
Física
Oxygen evolution reaction
Tafel relationships
Oxide coated G-16 electrodes
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/137887
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-137887
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
Física
Oxygen evolution reaction
Tafel relationships
Oxide coated G-16 electrodes
spellingShingle Ciencias Exactas
Física
Oxygen evolution reaction
Tafel relationships
Oxide coated G-16 electrodes
Kessler, Teresita
Triaca, Walter Enrique
Arvia, Alejandro Jorge
Kinetics and mechanism of the oxygen evolution reaction at oxide-coated Co-Ni amorphous alloy electrodes
topic_facet Ciencias Exactas
Física
Oxygen evolution reaction
Tafel relationships
Oxide coated G-16 electrodes
description Oxygen evolution reaction (o.e.r.) kinetics in NaOH solutions have been studied on both fresh and oxide covered Co50Ni25Si15B10 amorphous alloy (G-16) electrodes. Steady state polarization curves obtained in different aqueous xM NaOH (0.1 ⩽ x ⩽ 4) in the 30–80°C range fulfill Tafel relationships at low overpotentials; the Tafel slope is close to 2.3(RT/F) V dec−1 for both G-16 and oxide coated G-16 electrodes. At high overpotentials, ohmic relationships with slopes becoming increasingly steep, regardless of the NaOH concentration, are observed. In the Tafel region, the reaction order with respect to OH− is near 2. The apparent current density at constant potential, for oxide coated G-16 electrodes, is greater than that for uncoated G-16. The high catalytic activity of the oxide coated G-16 for the o.e.r. is attributed to its spinel-type structure. The kinetics of the o.e.r. at low overpotentials is explained through a mechanism involving a first electron transfer step followed by a rate-determining chemical step.
format Articulo
Articulo
author Kessler, Teresita
Triaca, Walter Enrique
Arvia, Alejandro Jorge
author_facet Kessler, Teresita
Triaca, Walter Enrique
Arvia, Alejandro Jorge
author_sort Kessler, Teresita
title Kinetics and mechanism of the oxygen evolution reaction at oxide-coated Co-Ni amorphous alloy electrodes
title_short Kinetics and mechanism of the oxygen evolution reaction at oxide-coated Co-Ni amorphous alloy electrodes
title_full Kinetics and mechanism of the oxygen evolution reaction at oxide-coated Co-Ni amorphous alloy electrodes
title_fullStr Kinetics and mechanism of the oxygen evolution reaction at oxide-coated Co-Ni amorphous alloy electrodes
title_full_unstemmed Kinetics and mechanism of the oxygen evolution reaction at oxide-coated Co-Ni amorphous alloy electrodes
title_sort kinetics and mechanism of the oxygen evolution reaction at oxide-coated co-ni amorphous alloy electrodes
publishDate 1994
url http://sedici.unlp.edu.ar/handle/10915/137887
work_keys_str_mv AT kesslerteresita kineticsandmechanismoftheoxygenevolutionreactionatoxidecoatedconiamorphousalloyelectrodes
AT triacawalterenrique kineticsandmechanismoftheoxygenevolutionreactionatoxidecoatedconiamorphousalloyelectrodes
AT arviaalejandrojorge kineticsandmechanismoftheoxygenevolutionreactionatoxidecoatedconiamorphousalloyelectrodes
bdutipo_str Repositorios
_version_ 1764820457656156160

Ejemplares similares