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Capacitance Value from CPE: A Calculator

 

 

 

RESOURCES > EIS > CPE > CALCULATING C > CALCULATOR

Nyquist for (RQ) This calculator can be used to calculate the "true" capacitance from a depressed semicircle model ( a Constant Phase Element in parallel with a resistor ). If your data has been fit to a depressed semicircle, locate the frequency at the top of the semicircle, and enter omegamax, Qo, and the exponent, n.

Press [Convert...] to update the value of the capacitance.

Enter Omegamax, CPE parameters:

omegamax

Qo

s-n

n
(exponent)

1.0 => n > 0.0
n value should be > 0.75 for reasonable confidence in C values

Capacitance

Press "Convert..." after you change Capacitance unit.

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The equation used by this calculator is:  C = Qo * (omegamax)(n-1)

The equation for the constant phase element assumed by this calculator is:

Z = 1 / [ Qo * ( j * omega )n ]

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REFERENCE
(1) "Concerning the Conversion of the Constant Phase Element Parameter Yo into a Capacitance," CS Hsu, F Mansfeld, Corrosion, 57(2001) 747.

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