1988 Volume 1988 Issue 8 Pages 1404-1408
Characteristics of oxygen electrode of an alkaline fuel cell in concentric cylindrical fluidized bed electrode (CFBE) were studied in 6 mol⋅dm-3 KOH solution at 60°C. A cylindrical nickel screen of 300 mm high and 40 mm in diameter was installed in the CFBE as a collector electrode.
Silver-activated carbon catalyst and alkaline electrolyte in the cell were fluidized by the introduction of oxygen gas.
The polarization charac t eristics were measured galvanostatically. The observed polarization curves were analyzed on the basis of a two-phase model. The performance of the CFBE was markedly improved with increasing catalyst loading. Apparent exchange current density, i0, increased with the amount of the catalyst loaded. The effective specific resista nce of catalyst particle phase, ρm, decreased with increasing amount of catalyst.
An effective distance of electron transfer was approximately c onstant regardless of the amount of catalyst loaded.
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