title: The influence of adsorption phenomena on the impedance spectroscopy of an electrolytic cell.
abstract: In this work we investigate the influence of the adsorption of ions on the impedance spectroscopy of an electrolytic cell. We consider that the positive and negative ions present in a dielectric liquid are adsorbed in the electrode surfaces with different adsorption energies. This difference in adsorption energies causes an additional plateaux in the limit of the low-frequency range of the real part of the impedance Z. In the same frequency range, a second minimum in the imaginary part of Z is predicted. The theory is illustrated with measurements of the impedance of an electrolytic solution in the frequency range from 10(-2) Hz to 1 KHz. A comparison between the present model and others from the literature to describe the experimental results is also made.
authors.affiliation: Instituto de Física, Universidade de São Paulo, P.O. Box 66318, 05314-970, SP-Brazil. f_batalioto@yahoo.com.br
authors.forename: F
authors.initials: F
authors.lastname: Batalioto
authors.forename: O G
authors.initials: OG
authors.lastname: Martins
authors.forename: A R
authors.initials: AR
authors.lastname: Duarte
authors.forename: A M
authors.initials: AM
authors.lastname: Figueiredo Neto
mesh_terms: D000327:Adsorption; D058266:Dielectric Spectroscopy / Q000379:methods*; D004566:Electrodes; D004572:Electrolysis / Q000379:methods*; D008962:Models, Theoretical; D011189:Potassium Chloride / Q000737:chemistry; D013499:Surface Properties
chemical_list: D011189:Potassium Chloride