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Impedance measurements by EIS and voltammograms measurements by CV on pretreated Pt electrodes immersed in an electrolytic solution of 0.5M H2SO4 are presented. Two electrochemical pretreatment techniques of the WE (thin Pt wire) are used: cleaning and etching. The results indicate that the origin of the capacitive dispersion of Pt / H2SO4 interface appears to depend on surface disorder and specific adsorption of ions. The effects of cleaning (clean surface at microscopic level) play a significant role in the capacitive dispersion. The adsorption of Cl ions known for their high capacity of adsorption on Pt plays a leading role, and adsorption and surface roughness are infinitely connected.

Dispersion Capacitive de l’Interface H2SO4/Pt = Capacitive Dispersion of Pt/H2SO4 Interface