Hydrodynamics studies of cyclic voltammetry for electrochemical micro biosensors

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 Bu...

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Bibliographic Details
Published in:Journal of physics. Conference series 2015-01, Vol.574 (1), p.1-5
Main Authors: Adesokan, B J, Quan, X, Evgrafov, A, Sorensen, M P, Heiskanen, A, Boisen, A
Format: Article
Language:English
Subjects:
Biosensors
Boundary conditions
Computational fluid dynamics
Convection
Electrodes
Electrolytes
Flow rate
Flow velocity
Fluid flow
Fluid mechanics
Hydrodynamics
Mathematical analysis
Mathematical models
Navier-Stokes equations
Physics
Reaction kinetics
Surface kinetics
Surface reactions
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Summary: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.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/574/1/012008