The Nucleation Rate of Single O2 Nanobubbles at Pt Nanoelectrodes

Langmuir : the ACS Journal of Surfaces and Colloids
Álvaro Moreno SotoHenry S White

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 a...Continue Reading

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Citations

Jun 14, 2019·Proceedings of the National Academy of Sciences of the United States of America·Jing ChenWei Wang
May 20, 2020·Analytical and Bioanalytical Chemistry·Ran ChenMei Shen
Feb 13, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Yunqing MaXianren Zhang
Oct 28, 2020·The Analyst·Shizhong AnLong Luo
Mar 19, 2021·Analytical Chemistry·Milomir Suvira, Bo Zhang
Oct 27, 2020·Current Opinion in Electrochemistry·Hang Ren, Martin A Edwards
Jul 9, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Valery V Belousov, Sergey V Fedorov
Mar 20, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Xu ZhaoLong Luo
Apr 3, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Shantanu MaheshwariAlbert D Harvey
Nov 25, 2020·Analytical Chemistry·Kira L Rahn, Robbyn K Anand
May 31, 2019·Journal of the American Chemical Society·Abdelilah El ArrassiKristina Tschulik
Jul 22, 2020·The Journal of Physical Chemistry Letters·Esteban D GadeaDamian A Scherlis
Jun 14, 2019·Journal of the American Chemical Society·Yamila A Perez SirkinValeria Molinero
Jun 27, 2019·The Journal of Physical Chemistry Letters·Yufei WangHang Ren
Nov 6, 2018·Journal of the American Chemical Society·Lane A Baker

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