Difference between Ultramicroelectrodes and Microelectrodes: Influence of Natural Convection

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TitreDifference between Ultramicroelectrodes and Microelectrodes: Influence of Natural Convection
Type de publicationJournal Article
Nouvelles publications2010
AuteursAmatore, C, Pebay C, Thouin L, Wang AF, Warkocz JS
JournalAnalytical Chemistry
Volume82
Fascicule16
Pagination6933-6939
Année de publicationAug
Numéro0003-2700
Accession NumberISI:000280758400026
Résumé

Natural convection in macroscopically immobile solutions may still alter electrochemical experiments performed with electrodes of micrometric dimensions. A model accounting for the influence of natural convection allowed delineating conditions under which it interferes with mass transport. Several electrochemical behaviors may be observed according to the time scale of the experiment, electrode dimensions, and intensity of natural convection. The range of parameters in which ultramicrelectrodes behave under a true diffusional steady state was identified. Mapping of concentration profiles was performed experimentally by scanning electrochemical microscopy in the vicinity of microelectrodes of various radii. The results validated remarkably the predictions of the model, evidencing in particular the alteration of the diffusional steady state by natural convection.

URL<Go to ISI>://000280758400026
DOI10.1021/ac101210r
Importer un fichierDifference between Ultramicroelectrodes and Microelectrodes: Influence of Natural Convection
Unité de rattachement: 
UMR 8640