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Impedance spectra of Pt(100) in aqueous 0.5 M H 2 SO 4  and 1 M HCl solutions have been measured in a potential range which includes the hydrogen adsorption/desorption peak and the double layer region. In the latter potential region the positive surface charge and the large  dc  capacitance imply that the double layer consist mostly of adsorbed anions; the capacitance spectra are markedly different for the two systems, revealing that adsorption/desorption is much faster for sulphate than for chloride.

Impedance Spectra of Pt(100) in Aqueous H 2 SO 4 and HCl Solutions Around the Hydrogen Adsorption-Desorption Peak