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

Rubén Rizo (), Julia Fernández-Vidal, Laurence J. Hardwick, Gary A. Attard, Francisco J. Vidal-Iglesias, Victor Climent, Enrique Herrero () and Juan M. Feliu ()
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Rubén Rizo: Universidad de Alicante
Julia Fernández-Vidal: University of Liverpool
Laurence J. Hardwick: University of Liverpool
Gary A. Attard: University of Liverpool
Francisco J. Vidal-Iglesias: Universidad de Alicante
Victor Climent: Universidad de Alicante
Enrique Herrero: Universidad de Alicante
Juan M. Feliu: Universidad de Alicante

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-30241-7

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