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

被引：45

作者：

Amatore, Christian ^{[1
]}

Pebay, Cecile ^{[1
]}

Thouin, Laurent ^{[1
]}

Wang, Aifang ^{[1
]}

机构：

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

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2009年 / 11卷 / 06期

关键词：

Cyclic voltammogram; Concentration profile; Convection; Mapping; Ultramicroelectrode; STEADY-STATE; MICRODISK; TRANSPORT; ELECTRODE; ULTRAMICROELECTRODE; PROBE;

D O I：

10.1016/j.elecom.2009.04.018

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

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.

引用

页码：1269 / 1272

页数：4

共 17 条

[1] Steady state voltammetry at low electrolyte/reactant concentration ratios: what it means and what it does not mean [J].

Amatore, C ;

Thouin, L ;

Bento, MF .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1999, 463 (01) :45-52

[2]

Amatore C, 2001, ELECTROANAL, V13, P646, DOI 10.1002/1521-4109(200105)13:8/9<646::AID-ELAN646>3.0.CO

[3]

2-B

[4] The real meaning of Nernst's steady diffusion layer concept under non-forced hydrodynamic conditions. A simple model based on Levich's seminal view of convection [J].

Amatore, C ;

Szunerits, S ;

Thouin, L ;

Warkocz, JS .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 2001, 500 (1-2) :62-70

[5] SPACE VARIABLES WELL FITTED FOR THE STUDY OF STEADY-STATE AND NEAR-STEADY-STATE DIFFUSION AT A MICRODISK [J].

AMATORE, CA ;

FOSSET, B .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1992, 328 (1-2) :21-32

[6] Alteration of diffusional transport by migration and natural convection. Theoretical and direct experimental evidences upon monitoring steady-state concentration profiles at planar electrodes [J].

Amatore, Christian ;

Knobloch, Keith ;

Thouin, Laurent .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 2007, 601 (1-2) :17-28

[7] Imaging concentration profiles of redox-active species with nanometric amperometric probes: Effect of natural convection on transport at microdisk electrodes [J].

Baltes, N ;

Thouin, L ;

Amatore, C ;

Heinze, J .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2004, 43 (11) :1431-1435

[8]

Bard A.J., 2001, Electrochemical Methods: Fundamentals and Applications, V2nd

[9] Voltammetry in solutions of low ionic strength. Electrochemical and analytical aspects [J].

Ciszkowska, M ;

Stojek, Z .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1999, 466 (02) :129-143

[10]

Davies J.T., 1972, TURBULENCE PHENOMENA

← 1 2 →