Stochastic electrochemistry with electrocatalytic nanoparticles at inert ultramicroelectrodes--theory and experiments |
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Authors: | Kwon Seong Jung Zhou Hongjun Fan Fu-Ren F Vorobyev Vasily Zhang Bo Bard Allen J |
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Institution: | Center for Electrochemistry, Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, TX 78712, USA. |
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Abstract: | 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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