Abstract
Oxygen reduction on Pt supported on carbon black in PTFE-bonded porous electrodes in 98% H 3PO 4 at 170°C was investigated. The influence of the Pt surface area and the volume of H 3PO 4 in the electrode structure (per cent acid occupation, PAO) on the performance of porous electrodes ( ie current-potential behavior, potential at a constant current density of 200 mA cm −2, oxygen gain) were evaluated. The results clearly show that the Pt surface area has a major influence on the Tafel slope, electrode polarization, electrode potential decay at constant current density, and oxygen gain. On the other hand, these parameters do not show a clear trend with PAO.
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