Cyclic Voltammetry: Characteristic Points

time (s)

show

point 1

point 2

point 3


at point 1: E = 0 E - 1.109 RT Fn = -0.0284728 [Ox] 0 [Red] 0 = -1.109 e

Cyclic voltammetry is one of the most popular techniques in electrochemistry. This Demonstration shows the characteristic points on a voltammogram. The potential, changing linearly with time, is shown on the left and the potential-current curve (voltammogram) is shown on the right.

Details

There are three significant points on a voltammogram[1]. Point 1 occurs at the current peak in the inverse direction; the potential of point 1 is near, but is not equal to, the standard potential

0

E

. Point 3 occurs at the current peak. The potential at point 2 is the standard potential

0

E

of the reaction. The direct determination of the position of point 2 is not practical, so the standard potential is calculated by averaging the potentials at point 3 and point 1:

0

E

=

E(atpoint1)+E(atpoint3)

2

.

References

J. P. Diard, B. L. Gorrec, and C. Montella, Cinétique électrochimique, Paris: Hermann, 1997.

Permanent Citation

Quang-Dao Trinh

"Cyclic Voltammetry: Characteristic Points"
http://demonstrations.wolfram.com/CyclicVoltammetryCharacteristicPoints/
Wolfram Demonstrations Project
Published: June 6, 2011