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WOLFRAM|DEMONSTRATIONS PROJECT

Redox Reaction (EE) at a Rotating Disk Electrode (RDE)

​
O + e
K
r
1
⟷
K
o
1
X
X + e
K
r
2
⟷
K
o
2
R
log ​
o
k
1
/cm
-1
s
​
-3.5
α
r
1
0.5
o
E
1
/V
0.2
log ​
o
k
2
/cm
-1
s
​
-3.5
α
r
2
0.5
o
E
2
/V
-0.25
*
c
O
mol
-3
cm
​
0.00001
Ω/rpm
4000.
E/V
0
This Demonstration plots the current density
j
f
versus the potential
E
for a redox EE reaction (
O+e⟷X,X+e⟷R)
under steady-state conditions at a rotating disk electrode. Simulated concentration profiles are shown, along with linearized (piecewise linear) concentration profiles of electroactive species according to Levich theory. IUPAC conventions are used.
D
O
=
D
X
=
D
R
=D=5.×
-6
10
2
cm
-1
s
;
ν=
-2
10
2
cm
-1
s
;
*
C
X
=
*
C
R
=0
.
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