Constant phase element

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A constant phase element is an equivalent electrical circuit component that models the behaviour of a double layer, that is an imperfect capacitor.

The electrical impedance can be calculated:

Z_{CPE}=\frac{1}{Q_0(\omega i)^n}=\frac{1}{Q_0\omega^n}e^{-\frac{\pi}{2}ni}

with Q0 = 1/|Z| at ω = 1 rad/s

The constant phase is always -(90*n)°, with n from 0 to 1. When n = 1, it is an ideal capacitor. When n = 0, it is a pure resistor.

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