| Autor: |
Diaz-Morales O; Leiden Institute of Chemistry, Leiden University, PO Box 9502, 2300 RA Leiden, The Netherlands. m.koper@chem.leidenuniv.nl., Hersbach TJP, Badan C, Garcia AC, Koper MTM |
| Jazyk: |
angličtina |
| Zdroj: |
Faraday discussions [Faraday Discuss] 2018 Oct 01; Vol. 210 (0), pp. 301-315. |
| DOI: |
10.1039/c8fd00062j |
| Abstrakt: |
The "hydrogen region" of platinum is a powerful tool to structurally characterize nanostructured platinum electrodes. In recent years, the understanding of this hydrogen region has improved considerably: on Pt(111) sites, there is indeed only hydrogen adsorption, while on step sites, the hydrogen region involves the replacement of adsorbed hydrogen by adsorbed hydroxyl which interacts with co-adsorbed cations. However, the hydrogen region features an enigmatic and less well-understood "third hydrogen peak", which develops on oxidatively roughened platinum electrodes as well as on platinum electrodes with a high (110) step density that have been subjected to a high concentration of hydrogen. In this paper, we present evidence that the peak involves surface-adsorbed hydrogen (instead of subsurface hydrogen) on a locally "reconstructed" (110)-type surface site. This site is unstable when the hydrogen is oxidatively removed. The cation sensitivity of the third hydrogen peak appears different from other step-related peaks, suggesting that the chemistry involved may still be subtly different from the other features in the hydrogen region. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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