Cyclic Voltammetry

1
Cyclic Voltammetry

• Paul R. Murray
• University of Edinburgh

2
What do We do now?

• Redox Process
• Find potential
• Data book?
• OK if known
• Unknown
• Potential Search
• Look for current (i)

3
Cyclic Voltammetry

• Vary Potential
• With time
• Sawtooth
• Return to initial ET
• Hence Cyclic!
• Emax El

ET /V
El
t /s
4
Cyclic Voltammetry

• Vary Potential
• With time
• Sawtooth
• Return to initial ET
• Hence Cyclic!
• Emax El
• Small WE surface
• Pt
• Tiny amounts of redox product

5
Cyclic Voltammetry
El
El
6
Cyclic Voltammetry
i/ A
0
ET/ V -ve
0
El
El
7
Cyclic Voltammetry
i/ A
0
ilim
ET/ V -ve
0
El
El
8
Cyclic Voltammetry
i/ A
0
ilim
ET/ V -ve
0
El
El
9
Cyclic Voltammetry
i/ A
0
ilim
ET/ V -ve
0
El
El
10
Cyclic Voltammetry
i/ A
0
ilim
ET/ V -ve
0
El
El