Influence of experimental factors on the constant phase element behavior of Pt electrodes

Constant phase element is still an object of controversy in the literature. It replaces capacitance or pseudocapacitance at solid electrodes. In the present paper influence of experimental parameters as cell geometry, distance between the working electrode and the Luggin capillary, surface roughness, and adsorption on the CPE parameters was studied. The obtained results indicate that the main cause of such behavior is adsorption of trace impurities from solution.

► Origin of the constant phase element at polycrystalline platinum electrodes. ► Influence of the cell geometry, distance between the working electrode and the Luggin capillary probe, and surface roughness on impedance measurements. ► Influence of adsorption of impurities on impedance measurements.