Moazzenzade T, Yang X, Walterbos L, Huskens J, Renault C, Lemay SG. Self-Induced Convection at Microelectrodes via Electroosmosis and Its Influence on Impact Electrochemistry.
J Am Chem Soc 2020;
142:17908-17912. [PMID:
33044066 PMCID:
PMC7582615 DOI:
10.1021/jacs.0c08450]
[Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
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Faradaic
reactions at low supporting electrolyte concentrations
induce convection via electroosmotic flows. Here we combine finite-element
simulations and electrochemical measurements on microparticles at
ultramicroelectrodes to explore this effect. We show that convection
becomes the dominant form of mass transport for experiments at low
salt concentrations, violating the common assumption that convection
can be neglected.
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