Hydrodynamics studies of cyclic voltammetry for electrochemical micro biosensors

Bolaji James Adesokan, Xueling Quan, Anton Evgrafov, Arto Heiskanen, Anja Boisen

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Abstract

We investigate the effect of flow rate on the electrical current response to the applied voltage in a micro electrochemical system. To accomplish this, we considered an ion-transport model that is governed by the Nernst-Planck equation coupled to the Navier-Stokes equations for hydrodynamics. The Butler-Volmer relation provides the boundary conditions, which represent reaction kinetics at the electrode-electrolyte interface. The result shows that convection drastically affects the rate of surface kinetics. At a physically sufficient high flow rates and lower scan rates, the current response is limited by the convection due to fresh ions being brought to the electrode surface and immediately taken away before any surface reaction. However, at high flow and scan rates, the Faradaic current overrides current due to convection. The model also allows predicting the effect of varying electrolyte concentration and scan rates respectively.
Original languageEnglish
Book seriesJournal of Physics: Conference Series (Online)
Volume574
Issue number012008
Number of pages5
ISSN1742-6596
DOIs
Publication statusPublished - 2015

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