Abstract
The kinetics of the adsorption process of neutral organic compounds on electrodes is studied from a theoretical point of view. Adopting simple kinetic arguments and within the frame of lattice statistical thermodynamics rate equations for electrosorption on homogeneous and random heterogeneous surfaces are developed when diffusion effects are negligible. The case where diffusion predominates is also studied. The Fick diffusion equation under constraints corresponding to an initially clean electrode surface is solved numerically. Adopting various adsorption isotherms, the influence on the electrosorption kinetics of a number of parameters, like the lateral particle—particle interactions, the field-dipole ones, as well as the adsorbent heterogeneity is investigated.
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