Difference between Ultramicroelectrodes and Microelectrodes: Influence of Natural Convection

被引：70

作者：

Amatore, Christian ^{[1
]}

Pebay, Cecile ^{[1
]}

Thouin, Laurent ^{[1
]}

Wang, Aifang ^{[1
]}

Warkocz, J-S. ^{[1
]}

机构：

[1] UMR CNRS ENS UPMC 8640 Pasteur, Dept Chim, Ecole Normale Super, F-75231 Paris 05, France

来源：

ANALYTICAL CHEMISTRY | 2010年 / 82卷 / 16期

关键词：

MAPPING CONCENTRATION PROFILES; STEADY-STATE; DIFFUSION LAYER; ELECTRODE; TRANSPORT; MIGRATION;

D O I：

10.1021/ac101210r

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

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.

引用

页码：6933 / 6939

页数：7

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