Abstract
Layered Pt1-xIrx (0 < x < 0.3) and Pt films were sputtered onto mirror-polished and nano-structured thin film (NSTF)-coated GC disks. Rotating ring disk electrode studies of oxygen reduction reaction activity (ORR) were completed for all disks prepared. The NSTF-supported catalysts had much higher active surface area and reached the diffusion-limited current at a higher potential than the mirror-polished supported catalysts. The surface enhancement factor (SEF) of Pt on NSTF-coated disks was approximately 14. The SEF increased, (reaching a maximum of 22 at x = 0.2 in Pt1-xIrx) as the Ir content increased. The kinetic ORR current density also increased with increasing Ir content. A similar trend was not observed for catalyst coated, mirror-polished disks. All of the catalyst/support combinations had identical Tafel slopes and area specific current densities suggesting that the Pt is the active catalytic ingredient.
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