Cyclic voltammetry at microelectrodes. Influence of natural convection on diffusion layers as characterized by in situ mapping of concentration profiles

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TitreCyclic voltammetry at microelectrodes. Influence of natural convection on diffusion layers as characterized by in situ mapping of concentration profiles
Type de publicationJournal Article
Nouvelles publications2009
AuteursAmatore, C, Pebay C, Thouin L, Wang AF
JournalElectrochemistry Communications
Volume11
Fascicule6
Pagination1269-1272
Année de publicationJun
Numéro1388-2481
Accession NumberISI:000267740100045
Résumé

Cyclic voltammetry was performed at microelectrodes under experimental conditions where no forced convection participates to the mass transport. Mapping of the dynamic concentration profiles were achieved using a method previously described. According to the time scale of the experiments and size of the microelectrodes, the results show that several regimes may be achieved. To delineate respectively the involvement of planar diffusion, hemispherical diffusion and natural convection in the overall mass transport, the experimental voltammograms and concentration profiles were compared to simulated ones accounting for each contribution. Excellent agreement was observed between data and predictions establishing that convection influences cyclic voltammetry even at microelectrodes reputed to be immune owing to their micrometric sizes. (C) 2009 Elsevier B.V. All rights reserved.

URL<Go to ISI>://000267740100045
DOI10.1016/j.elecom.2009.04.018
Importer un fichierCyclic voltammetry at microelectrodes. Influence of natural convection on diffusion layers as characterized by in situ mapping of concentration profiles
Unité de rattachement: 
UMR 8640