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Estimate of Mass-Transfer Rate via Nernst Model with Ohmic Losses
- 1.0377550 - ÚCHP 2013 RIV RU eng J - Journal Article
Wein, Ondřej
Estimate of Mass-Transfer Rate via Nernst Model with Ohmic Losses.
Russian Journal of Electrochemistry. Roč. 48, č. 7 (2012), s. 704-711. ISSN 1023-1935. E-ISSN 1608-3342
R&D Projects: GA ČR GA104/08/0428
Institutional research plan: CEZ:AV0Z40720504
Keywords : nernst model of diffusion layer * primary current distribution * voltammetric curve
Subject RIV: CI - Industrial Chemistry, Chemical Engineering
Impact factor: 0.501, year: 2012
The liming-current technique, employed e.g. in electrodiffusion flow diagnostics, is based on an oversimplified electrochemical concept, which accounts only for the convective transport of depolarizers across a diffusion layer with constant bulk and wall concentrations. However, there are additional transport resistances that cannot be neglected: Faradaic resistance at surface of working electrode, and Ohmic losses in the bulk of electrolyte solution. Effect of these additional resistances is analyzed using the Nernst model of a two-electrode cell (no reference electrode). The Faradaic resistances due to electrode kinetics are considered for a single redox couple O + ne- = R according to the Butler-Volmer electrode kinetics. The effect of Ohmic losses is accounted for, considering primary current distribution for a uniformly accessible circular electrode.
Permanent Link: http://hdl.handle.net/11104/0209676
Number of the records: 1