Collision Dynamics during the Electrooxidation of Individual Silver Nanoparticles
| Autor: | Henry S. White, Bo Zhang, Yuwen Liu, Stephen M. Oja, Martin A. Edwards, Donald A. Robinson, Nicholas J. Vitti |
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| Rok vydání: | 2017 |
| Předmět: |
Chemistry
Analytical chemistry Nanoparticle Exchange current density 02 engineering and technology General Chemistry Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry Catalysis Silver nanoparticle 0104 chemical sciences Microelectrode Colloid and Surface Chemistry Chemical physics Electrode Particle Diffusion (business) 0210 nano-technology |
| Zdroj: | Journal of the American Chemical Society. 139:16923-16931 |
| ISSN: | 1520-5126 0002-7863 |
| Popis: | Recent high-bandwidth recordings of the oxidation and dissolution of 35 nm radius Ag nanoparticles at a Au microelectrode show that these nanoparticles undergo multiple collisions with the electrode, generating multiple electrochemical current peaks. In the time interval between observed current peaks, the nanoparticles diffuse in the solution near the electrolyte/electrode interface. Here, we demonstrate that simulations of random nanoparticle motion, coupled with electrochemical kinetic parameters, quantitatively reproduce the experimentally observed multicurrent peak behavior. Simulations of particle diffusion are based on the nanoparticle-mass-based thermal nanoparticle velocity and the Einstein diffusion relations, while the electron-transfer rate is informed by the literature exchange current density for the Ag/Ag+ redox system. Simulations indicate that tens to thousands of particle–electrode collisions, each lasting ∼6 ns or less (currently unobservable on accessible experimental time scales), con... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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