Warburg Impedance
Warburg Impedance
The Warburg impedance is the diffusional impedance for 1D linear diffusion. This Demonstration shows the Randles equivalent circuit, taking into account the electrolyte resistance , the charge transfer resistance , and the double layer capacitance . Various shapes of the impedance diagram can be obtained when changing the parameter .
W
R
e
R
ct
C
dl
λ
Details
Details
The Warburg impedance is the diffusional impedance for the diffusion layer of infinite thickness, which is characterized for the macroelectrode.
The Warburg impedance is given by , where is the relative parameter of the charge transfer and the diffusion coefficient ,
W(ω)=λ
R
ct
ω
λ
k
D
λ
=
k
f
D
o
+
k
b
D
R
where , are heterogeneous kinetics on the electrode and , are the diffusion coefficients of the species oxidant and reductant.
k
f
k
b
D
O
D
R
With Warburg impedance, one can describe an electrochemical cell for the macroelectrode by the Randles equivalent circuit:
External Links
External Links
Permanent Citation
Permanent Citation
Quang-Dao Trinh
"Warburg Impedance"
http://demonstrations.wolfram.com/WarburgImpedance/
Wolfram Demonstrations Project
Published: December 9, 2010