Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 321339
Title Rigorous analysis of reversible Faradaic depolarization processes in the electrokinetics of the metal/electrolyte solution interface
Author(s) Duval, J.F.L.; Leeuwen, H.P. van; Cecilia, J.; Galceran, J.
Source The Journal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical 107 (2003). - ISSN 1520-6106 - p. 6782 - 6800.
Department(s) Physical Chemistry and Colloid Science
Publication type Refereed Article in a scientific journal
Publication year 2003
Keyword(s) spherical ultramicroelectrodes - superfast electrophoresis - electrochemical-behavior - electrolytic cell - dispersions - particles
Abstract The bipolar faradaic depolarization of the interface metal/solution is examined for the situation in which the transversal electron transfer is limited by mass transfer of the components of a reversible redox couple. Transversal diffusion of the electroactive species to and from the surface and lateral convective mass transport, resulting from a pressure gradient applied along the surface, are taken into account. The analysis first focuses on the case in which the lateral electric field required for bipolar behavior is externally applied through the solution. Numerical analysis of the intrinsic nonlinear coupling between the convective-diffusion equation and the Poisson equation for finite currents allows derivation of the spatial distribution of the potential and the concentration profiles of the electroactive species. The corresponding distribution of the local faradaic current density along the metallic surface and the ensuing overall bipolar current are obtained. Characteristics of the conductivity curves, bipolar current versus applied field, are given for different sets of electric and hydrodynamic parameters. Then, on the basis of these results, the analysis of bipolar faradaic depolarization process is extended to electrokinetic phenomena, in particular streaming potential.
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