Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 117, Issue 13, Pages 6651-6657Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp3126494
Keywords
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Funding
- Robert A. Welch Foundation [F-0021]
- National Science Foundation [CHE-1111518]
- Department of Defense, Defense Threat Reduction Agency [HDTRA1-11-1-0005]
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We report that conductive single nanoparticle (NP) collisions can involve a significant component of the mass transport to the electrode of the charged NPs by migration. Previously, collision events of catalytic NPs were described as purely diffusional using random walk theory. However, the charged NP can Also be attracted to the electrode by the electric field in solution (i.e., migration) thereby causing an enhancement in the collision frequency. The migration of charged NPs is affected by the supporting electrolyte concentration and the faradaic current flow. A simplified model based on the NP transference number is introduced to explain the migrational flux of the NPs. Experimental collision frequencies and the transference number model also agreed with more rigorous simulation results based on the Poisson and Nernst-Planck equations.
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