Visualization of bubble-induced mass transport at vertical hydrogen evolving electrodes

Visualization of bubble-induced mass transport at vertical hydrogen evolving electrodes | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Visualization of bubble-induced mass transport at vertical hydrogen evolving electrodes David Vermaas, Jorrit Bleeker, Florianne Wiegel, Aron Kahn, Willem Haverkort, and 5 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6732561/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted You are reading this latest preprint version Abstract Gas-evolving electrodes, for example in electrolysis applications, benefit from enhanced mass transport driven by movement of gas bubbles. To maximize this “bubble-induced mass transport”, we need to better understand the underlying processes. Here, we present an optical investigation of microscale mass transport processes at vertical hydrogen evolving electrodes. Using fluorescence lifetime imaging microscopy (FLIM), we show that the concentration boundary layer thickness is mainly reduced by bubble detachment. Combined with velocity profiles around bubbles at a nickel electrode, using micro-particle image velocimetry (μPIV) and an integrated mass transport model, we show that bubble detachment and wake flow reduce the boundary layer thickness with a factor 4-6. Our observations also show that isolated single bubble-events do not exist at vertical electrodes, due to frequent wake flow events from passing bubbles, even at low current densities (5 mA cm-2), which requires combined in-operando measurement techniques to assess mass transport at relevant conditions. Physical sciences/Chemistry/Chemical engineering Physical sciences/Energy science and technology/Fuel cells Physical sciences/Engineering/Chemical engineering Physical sciences/Chemistry/Electrochemistry/Electrocatalysis Full Text Additional Declarations There is NO Competing Interest. SI Video 1 to 3 are not available with this version Supplementary Files BubbletransportSI21May25.pdf Supplementary information for Visualization of bubble-induced mass transport at vertical hydrogen evolving electrodes Cite Share Download PDF Status: Under Review Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. 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