Electrochemical and nanoelectrogravimetric studies of the nucleation and growth mechanisms of rhenium on polycrystalline gold electrode

Schrebler, R; Cury P.; Orellana M.; Gómez H.; CORDOVA, R; Dalchiele, EA

Abstract

The nucleation and growth mechanisms for rhenium on polycrystalline gold electrodes from an electrolytic bath containing 0.75 mM HReO4+0.1 M Na2SO4 (pH 2) have been studied. The potentiostatic step technique was simultaneously employed with measurements of mass changes in an electrochemical quartz crystal microbalance. Scanning electronic microscopy of rhenium electrodeposits were obtained. The mass-time transients were fitted with equations deduced from the current-time relationships of the conventional nucleation and growth models. The global equation that fitted the ?m/t transients indicated that the electrodeposition process of rhenium started with a two-dimensional progressive nucleation (PN2D), followed by another two contributions. The first of them corresponds to a progressive nucleation growing under diffusion control (PN3Ddif) and the second contribution, which is observed at longer times, corresponds to a progressive nucleation under charge transfer control (PN3DCT). From these three contributions, the PN2D corresponds to the charge of a monolayer and was attributed to 2D nuclei produced by the reduction of adsorbed perrhenate. The PN3Ddif was the most important contribution and represented 70-80% of the mass increase. The faradic efficiency for the electrodeposition process was in the range of 12-18% for the experimental conditions of this study. © 2001 Elsevier Science Ltd. All rights reserved.

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Título según WOS: Electrochemical and nanoelectrogravimetric studies of the nucleation and growth mechanisms of rhenium on polycrystalline gold electrode
Título según SCOPUS: Electrochemical and nanoelectrogravimetric studies of the nucleation and growth mechanisms of rhenium on polycrystalline gold electrode
Título de la Revista: ELECTROCHIMICA ACTA
Volumen: 46
Número: 28
Editorial: PERGAMON-ELSEVIER SCIENCE LTD
Fecha de publicación: 2001
Página de inicio: 4309
Página final: 4318
Idioma: English
URL: http://linkinghub.elsevier.com/retrieve/pii/S0013468601007253
DOI:

10.1016/S0013-4686(01)00725-3

Notas: ISI, SCOPUS