Electroreflectance Of Well-defined Pt Surfaces

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All issues Volume 88 (1991) J. Chim. Phys., 88 (1991) 1339-1352 Abstract
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Issue J. Chim. Phys. Volume 88, 1991
Page(s) 1339 - 1352
DOI https://doi.org/10.1051/jcp/1991881339
Published online 29 May 2017
J. Chim. Phys., Vol. 88 (1991), pp. 1339–1352

Electroreflectance of well-defined Pt surfaces

FV Molina1 and R Parsons2,*

1 Departmento de Quimica Inorganica, Analitica y Quimica Fisica, FCEN, Universidad de Buenos Aires, Pabellon 2, Ciudad Universitaria, (1428) Buenos Aires, Argentina ; 2 Department of Chemistry, University of Southampton, Southampton, S09 5NH, UK ;

Abstract

A method has been devised to carry out UV/vis electroreflectance studies on electrodes making a meniscus contact with the electrolyte. In this way the electrochemical state of the surface can be monitored at the same time as the electroreflectance is studied. Experiments have been carried out on Pt single crystals oriented to expose the low index plans (111), (100) and (110). The region from the adsorption of hydrogen to the early stages of the adsorption of oxygen species has been studied in the wavelength range 365 nm to 630 nm. The characteristics of the reflectance change in the hydrogen region differ from those in the oxygen region and confirm that the so-called ‘anomalous’ region may be attributed to hydrogen adsorption.

Résumé

On présente un dispositif expérimental dans lequel on peut mesurer l’électroreflectivité, UV/visible, d’une surface métallique en contact capillaire avec l’électrolyte. L’état électrochimique de l’échantillon peut être contrôlé pendant les mesures optiques par voltammétrie cyclique. Les résultats sont obtenus pour le platine polycristallin et les surfaces orientées (111) (100) et (110). On a utilisé le domaine des longueurs d’onde entre 365 nm et 630 nm. Les caractéristiques de l’électroréflectivité dans le domaine d’adsorption d’hydrogène diffère de celles dans le domaine d’adsorption d’oxygène. On vérifie que le domaine dit "anormal" est vraiment lié à l’adsorption d’hydrogène.

*

Correspondence and reprints

© Elsevier, Paris, 1991

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