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Adsorption Kinetics of Normal-Heptanol on the Bismuth Single Crystal Planes

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Abstract

Cyclic voltammetry and impedance methods are employed for a quantitative study of normal-heptanol (n-HepOH) adsorption kinetics at the bismuth single-crystal plane/aqueous Na2SO4 solution interface. The results of nonlinear regression analysis show that the Frumkin–Melik-Gaikazyan (FMG) or Frumkin–Melik-Gaikazyan–Randles (FMGR) equivalent circuits can be used for the simulation of experimental impedance data. The dependences of adsorption capacitance (caused by the potential dependence of surface coverage), Warburg diffusion impedance, and adsorption resistance on the electrode potential and organic-compound concentration are established. Analysis of impedance data demonstrates that the adsorption of n-HepOH is mainly limited by the rate of diffusion of organic compound to the electrode surface. Small deviations toward mixed adsorption kinetics are established at very high frequencies. In the region of maximum adsorption in more concentrated n-HepOH solutions, the slow reorganization or two-dimensional association of adsorbed molecules is possible. However, the very low adsorption or partial charge transfer resistance values indicate that then-HepOH adsorption at Bi planes is a practically reversible process and thus there is no noticeable partial charge transfer between adsorbed n-HepOH molecules and Bi surface atoms.

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Authors and Affiliations

  1. Institute of Physical Chemistry, University of Tartu, 2 Jakobi Street, 51014, Tartu, Estonia

    A. Jänes, G. Nurk, K. Lust, J. Ehrlich & E. Lust

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  1. A. Jänes
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  2. G. Nurk
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  3. K. Lust
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  4. J. Ehrlich
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  5. E. Lust
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Jänes, A., Nurk, G., Lust, K. et al. Adsorption Kinetics of Normal-Heptanol on the Bismuth Single Crystal Planes. Russian Journal of Electrochemistry 38, 8–19 (2002). https://doi.org/10.1023/A:1013726109419

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