Kinetics and mechanism of H and OH electrosorption on faceted (100) Pt electrodes in acid solutions

The multiplicity of voltammetric peaks related to H-adatom and OH electroadsorption/electrodesorption reactions on faceted (100) Pt in 1 M H<sub>2</sub>SO<sub>4</sub> and 0.5 M HClO<sub>4</sub> are investigated at different temperatures by using linear sweep volta...

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Autores principales: Bilmes, S. A., Giordano, M. C., Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 1987
Materias:
Ciencias Exactas
Química
Electroadsorption
Electrodesorption
Voltammetric multiplicity
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/121513
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-121513
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
Electroadsorption
Electrodesorption
Voltammetric multiplicity
spellingShingle Ciencias Exactas
Química
Electroadsorption
Electrodesorption
Voltammetric multiplicity
Bilmes, S. A.
Giordano, M. C.
Arvia, Alejandro Jorge
Kinetics and mechanism of H and OH electrosorption on faceted (100) Pt electrodes in acid solutions
topic_facet Ciencias Exactas
Química
Electroadsorption
Electrodesorption
Voltammetric multiplicity
description The multiplicity of voltammetric peaks related to H-adatom and OH electroadsorption/electrodesorption reactions on faceted (100) Pt in 1 M H<sub>2</sub>SO<sub>4</sub> and 0.5 M HClO<sub>4</sub> are investigated at different temperatures by using linear sweep voltammetry with triangular modulation covering a relatively large frequency range of the modulating signal. The voltammetric multiplicity related to H-adatom reactions in acid electrolytes is sensitive to both the surface structure and the structure of the solution side of the edl. The kinetics of the reactions are apparently influenced in a cooperative way by the water-H-adatom-an-ion ensemble formed at each site of a particular crystallographic plane. The main three reactions exhibit different relaxation time constants from which one can infer that the process occurring in the potential range presumably closer to the potential of zero charge is the slowest one. Anion adsorption produces a surface energy leveling effect and changes the kinetics of the electrochemical reactions. The H-adatom reactions can be interpreted through a formalism comprising the surface diffusion of H-adatom among different adsorption sites followed by a relatively fast electrochemical step involving only one kind of H-adatom. Data obtained for the OH-adsorbed reaction show, in principle, the same trend as that of the H-adatom reactions, although in this respect more extensive data are required.
format Articulo
Articulo
author Bilmes, S. A.
Giordano, M. C.
Arvia, Alejandro Jorge
author_facet Bilmes, S. A.
Giordano, M. C.
Arvia, Alejandro Jorge
author_sort Bilmes, S. A.
title Kinetics and mechanism of H and OH electrosorption on faceted (100) Pt electrodes in acid solutions
title_short Kinetics and mechanism of H and OH electrosorption on faceted (100) Pt electrodes in acid solutions
title_full Kinetics and mechanism of H and OH electrosorption on faceted (100) Pt electrodes in acid solutions
title_fullStr Kinetics and mechanism of H and OH electrosorption on faceted (100) Pt electrodes in acid solutions
title_full_unstemmed Kinetics and mechanism of H and OH electrosorption on faceted (100) Pt electrodes in acid solutions
title_sort kinetics and mechanism of h and oh electrosorption on faceted (100) pt electrodes in acid solutions
publishDate 1987
url http://sedici.unlp.edu.ar/handle/10915/121513
work_keys_str_mv AT bilmessa kineticsandmechanismofhandohelectrosorptiononfaceted100ptelectrodesinacidsolutions
AT giordanomc kineticsandmechanismofhandohelectrosorptiononfaceted100ptelectrodesinacidsolutions
AT arviaalejandrojorge kineticsandmechanismofhandohelectrosorptiononfaceted100ptelectrodesinacidsolutions
bdutipo_str Repositorios
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