Formation and Diffusion of Subsurface Adsorbates at Electrodes
| Autor: | Olaf M. Magnussen, Björn Rahn |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Double layer (biology)
Surface diffusion chemistry.chemical_classification Sulfide 010405 organic chemistry Chemistry Diffusion General Chemistry 010402 general chemistry 01 natural sciences Biochemistry Catalysis 0104 chemical sciences law.invention Colloid and Surface Chemistry Adsorption law Chemical physics Surface layer Scanning tunneling microscope Layer (electronics) |
| Zdroj: | Journal of the American Chemical Society. 140(29) |
| ISSN: | 1520-5126 |
| Popis: | We report direct observation of the formation of a subsurface species at metal electrodes in liquid electrolytes and of its migration within the solid’s surface layer, below a chemisorbed electrochemical double layer. Using in situ video-rate scanning tunneling microscopy, we find for adsorbed sulfide on bromide-covered Ag(100) electrodes reversible transitions between adsorption sites on top of the surface and within a vacancy in the first Ag layer. In the latter state, the sulfide surface diffusion can be enhanced by orders of magnitude, which we attribute to vacancy-mediated diffusion underneath the bromide adlayer. The high dynamics within the surface layer, indicated by these observations, may open up alternative pathways in electrocatalytic reactions and growth processes. |
| Databáze: | OpenAIRE |
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