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Determination of the thicknesses of the active layer and cathode limiting currents in AFC by Yohannes Kiros; Tamara Quatrano; Pehr Björnbom is a Engineering article available to read on EtoBox.

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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 ði L Þ by varying the oxygen partial pressures in 6 M KOH and at 65 °C. 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 À2 for the PMM with 0.51 mm and 1.6 A cm À2 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.

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Author

Yohannes Kiros; Tamara Quatrano; Pehr Björnbom

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1388-2481)

Published

2004

Language

EN

Field

Engineering (Physical Sciences)