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. 2022 May 10;13(1):2550.
doi: 10.1038/s41467-022-30241-7.

Investigating the presence of adsorbed species on Pt steps at low potentials

Rubén Rizo  1 , Julia Fernández-Vidal  2 , Laurence J Hardwick  2 , Gary A Attard  3 , Francisco J Vidal-Iglesias  4 , Victor Climent  4 , Enrique Herrero  5 , Juan M Feliu  6
Affiliations

Investigating the presence of adsorbed species on Pt steps at low potentials

Rubén Rizo et al. Nat Commun. .

Erratum in

Abstract

The study of the OH adsorption process on Pt single crystals is of paramount importance since this adsorbed species is considered the main intermediate in many electrochemical reactions of interest, in particular, those oxidation reactions that require a source of oxygen. So far, it is frequently assumed that the OH adsorption on Pt only takes place at potentials higher than 0.55 V (versus the reversible hydrogen electrode), regardless of the Pt surface structure. However, by CO displacement experiments, alternating current voltammetry, and Raman spectroscopy, we demonstrate here that OH is adsorbed at more negative potentials on the low coordinated Pt atoms, the Pt steps. This finding opens a new door in the mechanistic study of many relevant electrochemical reactions, leading to a better understanding that, ultimately, can be essential to reach the final goal of obtaining improved catalysts for electrochemical applications of technological interest.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Fig. 1
Fig. 1. State of the art for Pt(111).
Cyclic voltammogram (black line, left hand axis) and charge density curve (red line, right hand axis) for Pt (111) recorded in 0.1 M HClO4 solution at a scan rate of 50 mV s−1. The region in blue corresponds to the hydrogen adsorption/desorption region, the region in green to the double layer, and the region in orange to the hydroxyl adsorption/desorption process.
Fig. 2
Fig. 2. CO displacement experiments on Pt(311).
a Cyclic voltammogram and total charge curve for Pt(311) surface as a function of the potential recorded at a scan rate of 50 mV s−1 and b CO displacement experiments at different potentials in 0.1 M HClO4 solution.
Fig. 3
Fig. 3. AC voltammetry on Pt(311).
AC voltammetry and cyclic voltammetry for different frequencies on a Pt(311) at 10 mV/s.
Fig. 4
Fig. 4. Raman spectra of the hydroxyl phase at low potentials on Pt(311).
Potential dependent in situ SHINERS spectra of Pt(311) electrode in 0.1 M HClO4 electrolyte purged with Ar. The different Raman bands are highlighted by the yellow squares.
See this image and copyright information in PMC

References

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