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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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Development of a 3D Graphene Electrode Dielectrophoretic Device

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Published on: June 22, 2014

Dynamic current density of the disk electrode double-layer.

Matthew R Behrend¹, Ashish K Ahuja, James D Weiland

¹Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90033, USA. behrend@usc.edu

IEEE Transactions on Bio-Medical Engineering

|March 13, 2008

Summary

This summary is machine-generated.

Current distribution on a disk electrode becomes more uniform over time. This finding helps control corrosion in implantable devices and suggests smaller electrodes may improve charge transfer efficiency.

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Area of Science:

Electrochemistry
Computational Modeling

Background:

Current distribution on disk electrodes is nonuniform and time-dependent.
Uniform current density and minimal corrosion are critical for electrode applications.

Purpose of the Study:

To analyze the current density profile of a capacitive disk electrode under voltage-step conditions.
To provide a basis for controlling corrosion in implantable electrodes.

Main Methods:

Utilized finite element analysis to solve partial differential equations.
Examined current density evolution over time.

Main Results:

Current density shifts from peripheral enhancement to near-uniformity within half a time constant.
Central current density becomes slightly enhanced during later charging stages.
Quantified the evolution of local time constants.

Conclusions:

The study provides insights into controlling electrode corrosion profiles.
Retarding stimulus pulse edges may mitigate corrosion.
Smaller electrodes show potential for enhanced surface area utilization in charge transfer.