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Issue 40, 2017
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In situ observation of Pt oxides on the low index planes of Pt using surface enhanced Raman spectroscopy

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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 with 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 the stretching vibration of Pt–O(H) and the 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 obtained using shell isolated surface enhanced Raman spectroscopy (SHINERS). The Pt–O and Pt–O(H) band intensities are normalized using COad as an internal standard. The Pt–O(H) band intensity depends on surface structures as Pt(110) < Pt(111) ≪ Pt(100), whereas the Pt–O band gives a different intensity order for Pt(111) and Pt(110) as Pt(111) ≤ Pt(110) ≪ Pt(100) in O2 saturated solution.

Graphical abstract: In situ observation of Pt oxides on the low index planes of Pt using surface enhanced Raman spectroscopy

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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., 2017,19, 27570-27579
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    In situ observation of Pt oxides on the low index planes of Pt using surface enhanced Raman spectroscopy

    F. Sugimura, N. Sakai, T. Nakamura, M. Nakamura, K. Ikeda, T. Sakai and N. Hoshi, Phys. Chem. Chem. Phys., 2017, 19, 27570
    DOI: 10.1039/C7CP04277A

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