TY - JOUR
T1 - Hydrodynamics studies of cyclic voltammetry for electrochemical micro biosensors
AU - Adesokan, Bolaji James
AU - Quan, Xueling
AU - Evgrafov, Anton
AU - Heiskanen, Arto
AU - Boisen, Anja
N1 - Published Open Access
PY - 2015
Y1 - 2015
N2 - 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.
AB - 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.
U2 - 10.1088/1742-6596/574/1/012008
DO - 10.1088/1742-6596/574/1/012008
M3 - Journal article
SN - 1742-6596
VL - 574
JO - Journal of Physics: Conference Series (Online)
JF - Journal of Physics: Conference Series (Online)
IS - 012008
ER -