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Time-Resolved Detection and Analysis of Single Nanoparticle Electrocatalytic Impacts
journal contribution
posted on 2023-02-01, 04:06 authored by Minkyung KangMinkyung Kang, D Perry, Y R Kim, A W Colburn, R A Lazenby, P R UnwinThere is considerable interest in understanding the interaction and activity of single entities, such as (electro)catalytic nanoparticles (NPs), with (electrode) surfaces. Through the use of a high bandwidth, high signal/noise measurement system, NP impacts on an electrode surface are detected and analyzed in unprecedented detail, revealing considerable new mechanistic information on the process. Taking the electrocatalytic oxidation of H2O2 at ruthenium oxide (RuOx) NPs as an example, the rise time of current-time transients for NP impacts is consistent with a hydrodynamic trapping model for the arrival of a NP with a distance-dependent NP diffusion-coefficient. NP release from the electrode appears to be aided by propulsion from the electrocatalytic reaction at the NP. High-frequency NP impacts, orders of magnitude larger than can be accounted for by a single pass diffusive flux of NPs, are observed that indicate the repetitive trapping and release of an individual NP that has not been previously recognized. The experiments and models described could readily be applied to other systems and serve as a powerful platform for detailed analysis of NP impacts.
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Journal
Journal of the American Chemical SocietyVolume
137Pagination
10902 - 10905Publisher DOI
ISSN
0002-7863eISSN
1520-5126Publication classification
C1.1 Refereed article in a scholarly journalUsage metrics
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