气候变化领域集成服务门户(CCPortal): Gas bubble evolution on microstructured silicon substrates

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DOI	10.1039/c8ee02657b
	Gas bubble evolution on microstructured silicon substrates
	Van Der Linde P.; Peñas-López P.; Moreno Soto Á.; Van Der Meer D.; Lohse D.; Gardeniers H.; Fernández Rivas D.
发表日期	2018
ISSN	17545692
起始页码	3452
结束页码	3462
卷号	11 期号:12
英文摘要	The formation, growth and detachment of gas bubbles on electrodes are omnipresent in electrolysis and other gas-producing chemical processes. To better understand their role in the mass transfer efficiency, we perform experiments involving successive bubble nucleations from a predefined nucleation site which consists of a superhydrophobic pit on top of a micromachined pillar. The experiments on bubble nucleation at these spots permit the comparison of mass transfer phenomena connected to electrolytically generated H 2 bubbles with the better-understood evolution of CO 2 bubbles in pressure-controlled supersaturated solutions. In both cases, bubbles grow in a diffusion-dominated regime. For CO 2 bubbles, it is found that the growth rate coefficient of subsequent bubbles always decreases due to the effect of gas depletion. In contrast, during constant current electrolysis the bubble growth rates are affected by the evolution of a boundary layer of dissolved H 2 gas near the flat electrode which competes with gas depletion. This competition results in three distinct regimes. Initially, the bubble growth slows down with each new bubble in the succession due to the dominant depletion of the newly-formed concentration boundary layer. In later stages, the growth rate increases due to a local increase of gas supersaturation caused by the continuous gas production and finally levels off to an approximate steady growth rate. The gas transport efficiency associated with the electrolytic bubble succession follows a similar trend in time. Finally, for both H 2 and CO 2 bubbles, detachment mostly occurs at smaller radii than theory predicts and at a surprisingly wide spread of sizes. A number of explanations are proposed, but the ultimate origin of the spreading of the results remains elusive. © 2018 The Royal Society of Chemistry.
英文关键词	Boundary layers; Bubbles (in fluids); Carbon dioxide; Efficiency; Electrodes; Electrolysis; Gases; Mass transfer; Nucleation; Silicon; Supersaturation; Bubble nucleation; Concentration boundary layer; Electrolytic bubble; Gas supersaturation; Mass transfer efficiency; Mass transfer phenomena; Microstructured silicons; Supersaturated solutions; Growth rate; air bubble; electrode; electrokinesis; energy efficiency; experimental study; microstructure; nucleation; silicon; substrate
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190043
作者单位	Mesoscale Chemical Systems Group, MESA+ Institute for Nanotechnology, Faculty of Science and Technology, University of Twente, P.O. Box 217, Enschede, 7500 AE, Netherlands; Fluid Mechanics Group, Universidad Carlos III de Madrid, Avda. de la Universidad 30, Leganés, Madrid, 28911, Spain; Physics of Fluids Group and Max Planck Center Twente, MESA+ Institute, J. M. Burgers Centre for Fluid Dynamics, Faculty of Science and Technology, University of Twente, P.O. Box 217, Enschede, 7500 AE, Netherlands
推荐引用方式 GB/T 7714	Van Der Linde P.,Peñas-López P.,Moreno Soto Á.,et al. Gas bubble evolution on microstructured silicon substrates[J],2018,11(12).
APA	Van Der Linde P..,Peñas-López P..,Moreno Soto Á..,Van Der Meer D..,Lohse D..,...&Fernández Rivas D..(2018).Gas bubble evolution on microstructured silicon substrates.Energy & Environmental Science,11(12).
MLA	Van Der Linde P.,et al."Gas bubble evolution on microstructured silicon substrates".Energy & Environmental Science 11.12(2018).