Abstract
Oxygen reduction reaction (ORR) has been studied on the low index planes of Pd modified with a monolayer of Pt (Pt/Pd( hkl)) in 0.1 M HClO 4 with the use of hanging meniscus rotating disk electrode. The activity for ORR on bare Pd( hkl) electrode depends on the surface structure strongly, however, voltammograms of ORR on Pt/Pd( hkl) electrodes do not depend on the crystal orientation. The specific activities of Pt/Pd( hkl) electrodes at 0.90 V (RHE) are higher than that on Pt(1 1 0) which has the highest activity for ORR in the low index planes of Pt. The mass activity on Pt/Pd( hkl) electrode is 7 times as high as a commercial Pt/C catalyst.
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