Mohsen Saeidi , Kaivan Mohammadi , MahsaSadat Adel Rastkhiz , Mina Orouji , Mostafa Jamshidian , Stanislav A. Evlashin , Jing Bai , Abdolreza Simchi
{"title":"Experimental and mathematical modeling of mass transfer dynamics of hydrogen bubbles on textured electrodes during electrochemical water splitting","authors":"Mohsen Saeidi , Kaivan Mohammadi , MahsaSadat Adel Rastkhiz , Mina Orouji , Mostafa Jamshidian , Stanislav A. Evlashin , Jing Bai , Abdolreza Simchi","doi":"10.1016/j.jpowsour.2025.236630","DOIUrl":null,"url":null,"abstract":"<div><div>The interplay between bubble release dynamics and surface wettability profoundly influences the performance of water dissociation systems; a topic not well understood. To systematically study the effect of electrode geometry and wettability, we have employed additive manufacturing to fabricate textured 316L-stainless steel electrodes composed of well-arranged pillars with different geometries and hydrophilicity. Through combined experimental and simulation approaches using bubbly flow models, we demonstrate that geometrically-induced wettability significantly affects hydrogen bubble dynamics, transitioning from gas-filled to liquid-filled states, and modulates bubble growth and detachment mechanisms. It is shown that the kinetics of bubble release and the surface coverage on hemispherical-topped pillars can finely be tuned to reduce the transport overpotential by 68.8 % and to increase the Faradaic efficiency (<span><math><mrow><mi>F</mi><mi>E</mi></mrow></math></span>) by 191.5 % at −300 mA cm<sup>−2</sup> relative to untextured electrodes. These findings delineate a pragmatic approach toward the design of textured electrodes for efficient gas-evolving reactions.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"640 ","pages":"Article 236630"},"PeriodicalIF":8.1000,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Power Sources","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0378775325004665","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
The interplay between bubble release dynamics and surface wettability profoundly influences the performance of water dissociation systems; a topic not well understood. To systematically study the effect of electrode geometry and wettability, we have employed additive manufacturing to fabricate textured 316L-stainless steel electrodes composed of well-arranged pillars with different geometries and hydrophilicity. Through combined experimental and simulation approaches using bubbly flow models, we demonstrate that geometrically-induced wettability significantly affects hydrogen bubble dynamics, transitioning from gas-filled to liquid-filled states, and modulates bubble growth and detachment mechanisms. It is shown that the kinetics of bubble release and the surface coverage on hemispherical-topped pillars can finely be tuned to reduce the transport overpotential by 68.8 % and to increase the Faradaic efficiency () by 191.5 % at −300 mA cm−2 relative to untextured electrodes. These findings delineate a pragmatic approach toward the design of textured electrodes for efficient gas-evolving reactions.
期刊介绍:
The Journal of Power Sources is a publication catering to researchers and technologists interested in various aspects of the science, technology, and applications of electrochemical power sources. It covers original research and reviews on primary and secondary batteries, fuel cells, supercapacitors, and photo-electrochemical cells.
Topics considered include the research, development and applications of nanomaterials and novel componentry for these devices. Examples of applications of these electrochemical power sources include:
• Portable electronics
• Electric and Hybrid Electric Vehicles
• Uninterruptible Power Supply (UPS) systems
• Storage of renewable energy
• Satellites and deep space probes
• Boats and ships, drones and aircrafts
• Wearable energy storage systems