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WOLFRAM|DEMONSTRATIONS PROJECT

Potential and Current Distributions over a Disk Electrode with Vibrating Probe

​
contour labels
equipotentials
electrode radius/cm
0.25
vibration amplitude/μm
1
ϕ
0
/V
1
κ/S
-1
cm
​
0.05
position of the SVP probe
x/cm =
0
z/cm =
z
current flowing at the disk
I
disk
/A =
Idisk
potential at the tip coordinates
ϕ
tip
/V =
pot
potential difference at the vibrating tip
Δϕ
tip
/V =
dpot
This Demonstration shows the primary current distribution over a disk electrode immersed in an electrolyte of constant conductivity and polarized at a constant voltage. The current distribution can be shown as current lines or as equipotential contours. In addition, the potential difference measured by a vibrating probe located in the solution is also determined. You can drag the probe, at position (
x
,
z
), and vary the amplitude of the vibration. The effect of the solution conductivity on the signal measured by the probe can also be demonstrated. Conductivities of 0.001 S/cm and 0.1 S/cm correspond roughly to solutions of 10 mM NaCl and 1 M NaCl, respectively.
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