International Journal of Hydrogen Energy, Год журнала: 2024, Номер unknown
Опубликована: Июль 1, 2024
Язык: Английский
Journal of the American Chemical Society, Год журнала: 2024, Номер 146(14), С. 10177 - 10186
Опубликована: Март 27, 2024
The evolution of electrogenerated gas bubbles during water electrolysis can significantly hamper the overall process efficiency. Promoting departure electrochemically generated (water) is therefore beneficial. For a single bubble, from electrode surface occurs when buoyancy wins over downward-acting forces (e.g., contact, Marangoni, and electric forces). In this work, dynamics pair H2 produced hydrogen reaction in 0.5 M H2SO4 using dual platinum microelectrode system systematically studied by varying distance cathodic potential. By combining high-speed imaging electrochemical analysis, we demonstrate importance bubble–bubble interactions process. We show that bubble coalescence may lead to substantially earlier as compared effects alone, resulting considerably higher rates at constant However, due continued mass input conservation momentum, repeated events with close drive departed back beyond critical current, which increases spacing. latter leads resumption growth near surface, followed buoyancy-driven departure. While less favorable small spacing, configuration proves be very beneficial larger separations, increasing mean current up 2.4 times under conditions explored study.
Язык: Английский
Процитировано
53
Journal of Power Sources, Год журнала: 2025, Номер 632, С. 236356 - 236356
Опубликована: Янв. 31, 2025
Язык: Английский
Процитировано
1
Small Methods, Год журнала: 2025, Номер unknown
Опубликована: Фев. 16, 2025
Abstract Electrocatalytic water splitting for hydrogen generation plays a crucial role in promoting the energy transition and achieving goals of carbon neutrality. Nevertheless, context electrolysis, generated bubbles have an adverse impact on consumption mass transfer efficiency. To address this challenge, variety strategies are investigated to accelerate bubble detachment transport. It is utmost significance summarize those facilitating advancement electrolysis performance. In review, comprehensive account presented enhancing performance through behavior management. First, electrolyte discussed. Then, optimized interactions between electrode surface introduced, which focus reducing adhesion forces implementing other forces. Next, dynamic bubbling deformable catalysts discussed, such as fern‐ caterpillar‐like catalysts. Following that, bubble‐bubble coalescence proved be beneficial earlier departure compared buoyancy effect alone. Finally, outlooks future development efficient removal enhanced The review aims deepen comprehension stimulate management strategies, thereby further electrolysis.
Язык: Английский
Процитировано
1
ACS Nano, Год журнала: 2025, Номер unknown
Опубликована: Фев. 20, 2025
The rapid bubble removal from electrodes diminishes the reaction resistance within photoelectrochemical water splitting, and coalescence between bubbles accelerates their detachment. To delve into size effects on dynamics, Marangoni effect is utilized as a noninvasively controlling means of sliding coalescence. study reveals that encounter capillary waves induces A quantitative correlation has been established to elucidate relationship oscillation time wave propagation. Then, undergo damping oscillations due fluid after detaching, characterized by same dimensionless periods. Additionally, detachment velocity follows power law 1/2 with ratio surface energy equivalent radius. Considering viscous dissipation adhesive electrode bubbles, critical radius large enabling jumping deduced perspective conservation. Our research provides strategy for management dynamic behavior practical application electrolysis technology.
Язык: Английский
Процитировано
1
ACS Energy Letters, Год журнала: 2024, Номер unknown, С. 212 - 237
Опубликована: Дек. 17, 2024
Water splitting is crucial for green hydrogen production, yet gas bubble dynamics has been underexplored until recently. Bubbles reduce electrochemically active surface area, increase overpotentials, and cause optical losses in (photo)electrochemical systems. Recent advancements both theoretical understanding experimental techniques have led to a deeper appreciation of the role that plays improving water performance. The present review revisits fundamental principles nucleation, growth, detachment during electrochemical reactions, highlighting recent progress single dynamics. Here we explore models behavior, observations using advanced techniques, strategies control We also discuss management devices enhance H2 production efficiency stability by facilitating effective detachment. In concluding section, outline prospects further studies future research directions needed overcome current challenges. This underscores critical achieving high performance provides roadmap directions.
Язык: Английский
Процитировано
5
Journal of the American Chemical Society, Год журнала: 2024, Номер 146(46), С. 31945 - 31949
Опубликована: Ноя. 5, 2024
Microbubbles, inside-out microdroplets, act as extraordinary microreactors to facilitate thermodynamically unfavorable reactions in bulk solutions of water. We explored the formation hydrogen peroxide (H
Язык: Английский
Процитировано
3
International Journal of Hydrogen Energy, Год журнала: 2024, Номер 93, С. 1330 - 1342
Опубликована: Ноя. 11, 2024
Язык: Английский
Процитировано
3
Acta Physica Sinica, Год журнала: 2025, Номер 74(10), С. 0 - 0
Опубликована: Янв. 1, 2025
Understanding the oxygen bubble evolution on electrode surface is important to enhance efficiency of large-scale water decomposition. In this paper, a numerical model for growth bubbles based dissolved flux at boundary proposed, and mechanisms reaction area current are investigated. The results show that diameters calculated from in good agreement with control phase chemical reaction. As region increases, transition time diffusion-controlled reaction-controlled stage becomes longer during growth. concentration maximum microelectrode significantly higher than large surface, which leads steeper gradient between surface. rate increases coefficient decreases faster. diameter 0.06 mA agrees well 0.1 photoelectrochemical splitting experiments. This because scattering light by growing decrease density bottom bubble.
Язык: Английский
Процитировано
0
Chemical Engineering Science, Год журнала: 2025, Номер unknown, С. 121598 - 121598
Опубликована: Март 1, 2025
Язык: Английский
Процитировано
0
Industrial & Engineering Chemistry Research, Год журнала: 2025, Номер unknown
Опубликована: Апрель 16, 2025
Язык: Английский
Процитировано
0