Determination of the thicknesses of the active layer and cathode limiting currents in AFC
2004 (English)In: Electrochemistry communications, ISSN 1388-2481, E-ISSN 1873-1902, Vol. 6, no 6, 526-530 p.Article in journal (Refereed) Published
A series of double-layered gas diffusion electrodes with two different electrocatalysts, i.e., Ag and pyrolyzed macrocycle mixture (PMM) were prepared in order to find out the maximum limiting current densities (i(L)) by varying the oxygen partial pressures in 6 M KOH and at 65 degreesC. As optimization of the active (catalyst) layer is important for better utilization of the catalytic reactions for oxygen reduction and thereby attainment of high current density, electrochemical measurements in half-cells were carried out to substantiate the current-thickness relationships. The thicknesses for both the active layers and diffusion layers were determined by using SEM. i(L) for an oxygen concentration simulating that of air was found to be 2.2 A cm(-2) for the PMM with 0.51 mm and 1.6 A cm-2 for the Ag-based catalyst with 0.56 mm thicknesses of the active layer. An overlay of a mathematical model, describing the parameters for determination of i(L), has also been inserted alongside the experimental values.
Place, publisher, year, edition, pages
2004. Vol. 6, no 6, 526-530 p.
oxygen reduction, Ag, pyrolyzed macrocycle, limiting current, thickness, active layer, alkaline fuel-cell, mathematical-model, oxygen, electrodes, reduction, electrocatalysts, area
IdentifiersURN: urn:nbn:se:kth:diva-23464DOI: 10.1016/j.elecom.2004.03.015ISI: 000221735200003ScopusID: 2-s2.0-2442592914OAI: oai:DiVA.org:kth-23464DiVA: diva2:342162
QC 20100525, QC 201110032010-08-102010-08-102011-10-03Bibliographically approved