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In-situ observation of Pt oxides on the low index planes of Pt with surface enhanced Raman spectroscopy

Abstract

In-situ vibrational spectra of Pt oxides that cannot be measured with IR spectroscopy have been studied on the low index planes of Pt using surface enhanced Raman spectroscopy by bare Au nanoparticles (NPSERS). Two bands appear around 570 and 340 cm-1 at higher potentials in 0.1 M HClO4 saturated with Ar, which are assigned to stretching vibration of Pt-O(H) and libration vibration of Pt-O, respectively. NPSERS spectra are measured in O2 saturated solution for the first time. The band intensities of Pt-O(H) and Pt-O in O2 saturated solution are enhanced significantly compared with those in Ar saturated solution. The onset potentials of Pt-O and Pt-O(H) formation are 1.15 V(RHE) on Pt(100) and 1.2 V(RHE) on Pt(111) and Pt(110). The onset potential of Pt-O and Pt-O(H) and band shape differ from the results using shell isolated surface enhances Raman spectroscopy (SHINERS). The Pt-O and Pt-O(H) band intensities are normalized using COad as an internal standard. Pt-O(H) band intensity depends on surface structures as Pt(110) < Pt(111) << Pt(100), whereas Pt-O band gives different intensity order for Pt(111) and Pt(110) as Pt(111) ≤ Pt(110) << Pt(100) in O2 saturated solution.

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Publication details

The article was received on 26 Jun 2017, accepted on 15 Sep 2017 and first published on 15 Sep 2017


Article type: Paper
DOI: 10.1039/C7CP04277A
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    In-situ observation of Pt oxides on the low index planes of Pt with surface enhanced Raman spectroscopy

    F. Sugimura, N. Sakai, T. Nakamura, M. Nakamura, K. Ikeda, T. Sakai and N. Hoshi, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP04277A

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