AI Article Synopsis
- The OH adsorption on Pt single crystals is crucial for understanding various electrochemical reactions, particularly oxidation reactions needing oxygen.
- Previous assumptions stated that OH adsorption only occurs at potentials above 0.55 V, overlooking the influence of Pt's surface structure.
- Recent experiments revealed that OH can adsorb at more negative potentials on low-coordinated Pt atoms (steps), enhancing our understanding of electrochemical mechanisms and improving catalyst development for technological applications.
Article 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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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9090771 | PMC |
| http://dx.doi.org/10.1038/s41467-022-30241-7 | DOI Listing |
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