Study of adsorption of tetraethylammonium ions on Bi single crystal planes from solutions in ethanol |
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Authors: | Mart Väärtnõu Enn Lust |
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Institution: | (1) Institute of Physical Chemistry, University of Tartu, Jakobi 2, 51014 Tartu, Estonia |
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Abstract: | The adsorption of tetraethylammonium (TEA+) ions on the (001) and planes of the bismuth single crystal from solutions in ethanol has been investigated by impedance measurement method. The
experimental data were obtained in 0.02 M mixed-electrolyte solutions and the calculations performed with electrode potential
as the independent electrical variable. The Gibbs energy of adsorption of TEA+ ions has been calculated using the simple virial adsorption isotherm, and it was found that the adsorption of TEA+ cations is weaker than the adsorption of halide anions. The electrosorption valency evaluated has a nearly constant value
in the potential region studied. It was concluded that the formed effective surface dipole is significantly screened by the
solvent molecules and the metal electron gas. The analysis of the impedance spectra was performed by fitting the experimental
data to the various equivalent circuits. It was found that the behaviour of TEA+ ions at Bi(hkl)∣ethanol interface can be described with the equivalent circuit, corresponding to the classical Frumkin–Melik-Gaikazyan
model. The results obtained indicate that only weak interaction between TEA+ ions and bismuth surface takes place, and there is no remarkable partial charge transfer from the adsorbed ions to the Bi
surface atoms. |
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Keywords: | Adsorption Tetraethylammonium ion Bismuth Ethanol Impedance |
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