Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 13, Issue 12, Pages 5394-5402Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0cp02543g
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Funding
- National Science Foundation [CHE 0808927]
- Robert A. Welch Foundation [F-0021]
- Korean Government [NRF-2009-352-C00057]
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Collisions of several kinds of metal or metal oxide single nanoparticles (NPs) with a less catalytic electrode surface have been observed through amplification of the current by electrocatalysis. Two general types of current response, a current staircase or a current blip (or spike) are seen with particle collisions. The current responses were caused by random individual events as a function of time rather than the usual continuous current caused by an ensemble of a large number of events. The treatment of stochastic electrochemistry like single NP collisions is different from the usual model for ensemble-based electrochemical behaviour. Models for the observed responses are discussed, including simulations, and the frequency of the steps or blips investigated for several systems experimentally.
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