Abstract
The adsorption of Br− anions on the Bi(111) single crystal plane from solutions in propylene carbonate and gamma-valerolactone has been investigated with impedance measurements. The ionic charge due to the specific adsorption has been obtained using the mixed-electrolyte method applied for both electrode charge and electrode potential as the independent electrical variables. The Gibbs energy of Br− anions adsorption has been calculated using the virial adsorption isotherm. It was found that under comparable conditions, the standard Gibbs energy values obtained at constant electrode potential and at constant electrode charge, are coincident and the Gibbs energy of Br− anion adsorption increases in the sequence of solvents: ethanol < propylene carbonate < gamma-valerolactone. The electrosorption valency values have been calculated and it was found that this parameter increases in the sequence: propylene carbonate ≤ ethanol < gamma-valerolactone.
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