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Collision Dynamics during the Electrooxidation of Individual Silver Nanoparticles
- Source :
- Journal of the American Chemical Society. 139:16923-16931
- Publication Year :
- 2017
- Publisher :
- American Chemical Society (ACS), 2017.
-
Abstract
- 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...
- Subjects :
- 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
Subjects
Details
- ISSN :
- 15205126 and 00027863
- Volume :
- 139
- Database :
- OpenAIRE
- Journal :
- Journal of the American Chemical Society
- Accession number :
- edsair.doi.dedup.....3e02afabb55dde330d633469a341b414