The nucleation rate of single O2 nanobubble at Pt nanoelectrodes

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Show simple item record Moreno Soto, Álvaro German, Sean R. Ren, Hang Van Der Meer, Devaraj Lohse, Detlef Edwards, Martin A. White, Henry S. 2022-02-01T11:41:57Z 2022-02-01T11:41:57Z 2018-06-26
dc.identifier.bibliographicCitation Soto, L. M., German, S. R., Ren, H., van der Meer, D., Lohse, D., Edwards, M. A. & White, H. S. (2018). The Nucleation Rate of Single O2 Nanobubbles at Pt Nanoelectrodes. Langmuir, 34(25), 7309–7318
dc.identifier.issn 0743-7463
dc.description.abstract Nanobubble nucleation is a problem that affects efficiency in electrocatalytic reactions since those bubbles can block the surface of the catalytic sites. In this article, we focus on the nucleation rate of O2 nanobubbles resulting from the electrooxidation of H2O2 at Pt disk nanoelectrodes. Bubbles form almost instantaneously when a critical peak current, inbp, is applied, but for lower currents, bubble nucleation is a stochastic process in which the nucleation (induction) time, tind, dramatically decreases as the applied current approaches inbp, a consequence of the local supersaturation level, ζ, increasing at high currents. Here, by applying different currents below inbp, nanobubbles take some time to nucleate and block the surface of the Pt electrode at which the reaction occurs, providing a means to measure the stochastic tind. We study in detail the different conditions in which nanobubbles appear, concluding that the electrode surface needs to be preconditioned to achieve reproducible results. We also measure the activation energy for bubble nucleation, Ea, which varies in the range from (6 to 30)kT, and assuming a spherically cap-shaped nanobubble nucleus, we determine the footprint diameter L = 8–15 nm, the contact angle to the electrode surface θ = 135–155°, and the number of O2 molecules contained in the nucleus (50 to 900 molecules).
dc.format.extent 10
dc.language.iso eng
dc.publisher American Chemical Society
dc.rights © 2018 American Chemical Society. This is an open access article published under a Creative Commons Non-Commercial No Derivative Works (CC-BY-NC-ND) Attribution License, which permits copying and redistribution of the article, and creation of adaptations, all for non-commercial purposes.
dc.rights Atribución-NoComercial-SinDerivadas 3.0 España
dc.title The nucleation rate of single O2 nanobubble at Pt nanoelectrodes
dc.type article
dc.subject.eciencia Ingeniería Industrial
dc.subject.eciencia Materiales
dc.rights.accessRights openAccess
dc.type.version publishedVersion
dc.identifier.publicationfirstpage 7309
dc.identifier.publicationissue 25
dc.identifier.publicationlastpage 7318
dc.identifier.publicationtitle Langmuir
dc.identifier.publicationvolume 34
dc.identifier.uxxi AR/0000029093
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