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- Title
Investigating the presence of adsorbed species on Pt steps at low potentials.
- Authors
Rizo, Rubén; Fernández-Vidal, Julia; Hardwick, Laurence J.; Attard, Gary A.; Vidal-Iglesias, Francisco J.; Climent, Victor; Herrero, Enrique; Feliu, Juan M.
- 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. The adsorption of OH species is of paramount importance in many electrochemical reactions of interest and, so far, it is frequently assumed that it takes place at potentials higher than 0.55 V. Here the authors demonstrate OH is adsorbed at more negative potentials on the low coordinated Pt atoms by CO displacement experiments and Raman spectroscopy.
- Subjects
CATALYSTS; STANDARD hydrogen electrode; RAMAN spectroscopy; ALTERNATING currents; SINGLE crystals; SURFACE structure
- Publication
Nature Communications, 2022, Vol 13, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-022-30241-7