Determination of Capacitance

It is incorrect to equate the CPE parameter Q to the interfacial capacitance. A number of researchers have explored the relationship between CPE parameters and the interfacial capacitance. Hsu and Mansfeld proposed 

A similar relationship between the interfacial capacitance and the CPE coefficient Q was developed for a Faradaic system as 

For CPE behavior caused by 2-D distributions of current and potential on a disk electrode, equations (13.9) and (13.10) provided the most reliable estimate for interfacial capacitance (see Section 13.3). Similar formulas for 3-D distributions do not exist. 

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Varadi, A., Cirulli, V. and Rutter, G. A., 2004, Mitochondrial localization as a determinant of capacitative Ca2+ entry in HeLa cells. Cell Calcium 36, 499—508. 

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