In Situ STM Study of the Surface Structure, Dissolution, and Early Stages of Electrochemical Oxidation of the Ag(111) Electrode
| Autor: | Vincent Maurice, Lorena H. Klein, Philippe Marcus, Hans-Henning Strehblow |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Chemistry
Inorganic chemistry Oxide Electrochemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention chemistry.chemical_compound General Energy Adsorption law Monolayer Hydroxide Physical and Theoretical Chemistry Scanning tunneling microscope Dissolution Silver oxide |
| Zdroj: | The Journal of Physical Chemistry C. 111:16351-16361 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp0742517 |
| Popis: | The surface structural modifications induced by underpotential anodic oxidation have been studied at the Ag(111)/0.1 M NaOH(aq) interface by in situ electrochemical scanning tunneling microscopy. For Epzc ≤ E ≤ −0.1 V/SHE, no specific surface structure results from the adsorption of hydroxide ions, indicating the formation of a weakly bonded and mobile layer of adsorbed hydroxide species. For −0.05 ≤ E ≤ 0.05 V/SHE, the Ag(111) surface undergoes reconstruction. The terraces become completely covered by irregularly arranged protrusions assigned to nuclei of a 2D layer similar to silver oxide and separated by non-reconstructed regions with adsorbed hydroxide. The 2D oxide islands consist of one reconstructed layer of silver embedded between two layers of subsurface species (oxide) and surface species (oxide and/or hydroxide). Atomic resolution evidences an enlarged Ag−Ag distance consistent with the growth of one monolayer of Ag2O(111). Long-range structural ordering is improved by reducing the rate of reco... |
| Databáze: | OpenAIRE |
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