Mass Transport at Microband Electrodes: Transient, Quasi-Steady-State, and Convective Regimes

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TitleMass Transport at Microband Electrodes: Transient, Quasi-Steady-State, and Convective Regimes
Publication TypeJournal Article
Year of Publication2012
AuthorsAmatore, C, Pebay C, Sella C, Thouin L
JournalChemPhysChem
Volume13
Issue6
Pagination1562 - 1568
Date Published04/2012
Abstract

Mass transport at microband electrodes is investigated theoretically and experimentally in unstirred solutions by chronoamperometry and cyclic voltammetry. Because natural convection limits the convection-free domain up to which diffusion layers may only expand, several regimes of mass transport are identified through simulation by means of a previous model. A zone diagram is established which allows all relative contributions to mass transport to be delineated according to the electrode dimension, timescale of experiment, and amplitude of natural convection. In opposition to the quasi-steady-state regime usually expected at microband electrodes under diffusion control, a steady-state regime always occurs at long enough times. By comparison to microdisk electrodes, a greater influence of natural convection is predicted. These results are validated experimentally by monitoring current responses and mapping steady-state concentration profiles at microband electrodes.

DOI10.1002/cphc.201100942
Short TitleChemPhysChem
Unit: 
UMR 8640