Size Effects on Bubble Dynamics during Photoelectrochemical Water Splitting

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 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.

Language: Английский

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Desert Beetle Inspired Heterogeneous Electrode for Large Current Density Hydrogen Evolution Reaction

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 18, 2025

Abstract The hydrogen (H 2 ) evolution reaction (HER) is a pivotal process in the production of green H , which will play crucial role future sustainable energy systems. Despite extensive efforts to optimize catalyst activity, great challenges related mass transfer at electrode interface still impede improvement HER efficiency. Here, catalytic system inspired designed by desert‐beetle's hydrophilic/hydrophobic patterned back, natural structure capable condensing and transporting fog droplets. This composed superaerophobic (SAB) electrocatalytic dots surrounded with superaerophilic (SAL) coating, can efficiently enhance gaseous dissolved achieve exceptional performance. Such desert beetle‐inspired using platinum (Pt) as achieves an excellent current density (−1252 mA cm −2 −0.5 V versus RHE, times higher than conventional Pt (−408.5 ). overpotential required −10 only −7 mV, compared −25 mV on electrode. also applicable various catalysts (e.g., Re‐Co, Co‐Cu, Co‐Mo, Cu‐Mo, Ni‐Mo), exhibit minimum 200% increase, their structures.

Language: Английский

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Oxygen versus Hydrogen Bubble Dynamics during Water Electrolysis at Microelectrodes

PRX Energy, Journal Year: 2025, Volume and Issue: 4(1)

Published: March 21, 2025

While the dynamics of hydrogen bubbles during water electrolysis have been intensively studied in recent years, adequate insights into oxygen are still lacking. Therefore, this study presents a comparative analysis and bubble potentiostatic an acidic electrolyte. Complementary optical techniques, such as high-speed shadowgraphy, particle tracking velocimetry, schlieren imaging applied to measure geometric features evolving microscale Marangoni convection, well refractive index field around growing bubbles. Distinct differences between found average current, convection pattern, degree reduction at foot, suggesting synergetic action both thermal solutal effects Published by American Physical Society 2025

Language: Английский

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Graphdiyne: The Emerging Energy Conversion Material

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 23, 2025

Abstract Global research efforts aimed at substituting fossil fuels with clean energy sources have been intensified to tackle the crisis and associated environmental challenges. Nevertheless, a thorough transition necessitates discovery of new materials that continuously revolutionize efficiency conversion. Graphdiyne (GDY), promising carbon allotrope, has garnered substantial interest across various disciplines. Notably, as an emerging conversion material, GDY exhibits unique structure properties distinguish it from conventional materials, including highly conjugated large π network, rich chemical bonds, non‐uniform charge distribution, well 2D electronic fast transfer channels 3D ionic channels. This review offers overview recent advancements in field conversion, hydrogen artificial photosynthesis, solar cells, fast‐charging batteries, devices based on reversible alkyne‐to‐alkene GDY.

Language: Английский

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Induced Flow and Coalescence Effects on Hydrogen Bubble Size Distribution Around a Single Wire Electrode in Alkaline Water Electrolysis.+

Chemical Engineering Science, Journal Year: 2025, Volume and Issue: unknown, P. 121598 - 121598

Published: March 1, 2025

Language: Английский

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