 ISSN 0235-7216 ISSN 2424-4538 (online) |
2007 m. Nr. 1 Effect of Sn(II) on adsorption ability of benzaldehyde
on tin electrode in 1 M H2SO4 solutions
EIS data were obtained for tin electrode in 1 M H2SO4 solutions containing milimolar amounts of benzaldehyde. It was found that the formation of adsorption layers was rather a slow process taking 2–3 hours till the stationary state was attained. However, Kramers–Kronig transforms show that in general the system remains sufficiently stable during one record of the impedance spectrum. The exception is Sn(II)-free solutions at short (less than 20 min) exposure times. Experimental impedance spectra can be quantitatively described with high accuracy (frequency error is less than 2%) by means of RW(Qdl[RadCadWad][RctQd]) equivalent circuit containing both adsorption and charge transfer parameters. The analysis of their dynamics show that the adsorption layers are more mobile in the presence of Sn(II) and the reversibility of the adsorption-desorption processes is higher in this case. Keywords: tin, benzaldehyde, adsorption, impedance |
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