Estimate of Mass-Transfer Rate via Nernst Model with Ohmic Losses

0377550 - ÚCHP 2013 RIV RU eng J - Článek v odborném periodiku
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
Grant CEP: GA ČR GA104/08/0428
Výzkumný záměr: CEZ:AV0Z40720504
Klíčová slova: nernst model of diffusion layer * primary current distribution * voltammetric curve
Kód oboru RIV: CI - Průmyslová chemie a chemické inženýrství
Impakt faktor: 0.501, rok: 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.
Trvalý link: http://hdl.handle.net/11104/0209676