2012•Zeitschrift für Physikalische ChemieRequires access

Impedance Spectra of Pt(100) in Aqueous H2SO4 and HCl Solutions Around the Hydrogen Adsorption-Desorption Peak

Tamás Pajkossy

Abstract

Abstract Impedance spectra of Pt(100) in aqueous 0.5 M H2SO4 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.

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Available abstract

Key concepts: Desorption, Adsorption, Aqueous solution, Analytical Chemistry (journal), Spectral line, Hydrogen, Capacitance, Hydrogen chloride