NPSERS of the High Index Planes of Pt

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Raman band of PtO has been detected using nanoparticle surface enhanced Raman spectroscopy (NPSERS). NPSERS is measured on Pt(100) and Pt(110) electrodes in 0.1 M HF solution. Pt(100) has the lowest activity for the ORR, whereas Pt(110) has the highest activity in the low index planes. A band is detected around 500 cm-1. This band is assigned to PtO. The band intensity of PtO in O2 saturated solution is higher than that in Ar saturated solution on Pt(100). On Pt(110), however, the band intensity in O2 satureted solution is as high as that in Ar saturated one. These facts support that PtO deactivates the ORR on Pt(100) electrode.