The effect of buoyancy driven convection on the growth and dissolution of bubbles on electrodes

Sepahi, Farzan; Pande, Nakul; Chong, Kai Leong; Mul, Guido; Verzicco, Roberto; Lohse, Detlef; Mei, Bastian; Krug, Dominik

doi:10.1016/j.electacta.2021.139616

Cited by 18 publications

(23 citation statements)

References 56 publications

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“…In addition, nucleation prefers to occur at the rough, cavity, and cracked surfaces due to their reduced Gibbs free energy for bubble nucleation compared with the plate electrode. ,− Theoretically, the increase in nucleation sites indicates a higher current density under a lower overpotential. Consequently, the electrochemical reaction area and surface morphology are crucial to the optimization of bubble nucleation. , …”

Section: Bubble Behaviormentioning

confidence: 99%

“…Consequently, the electrochemical reaction area and surface morphology are crucial to the optimization of bubble nucleation. 41,42 Bubbles grow gradually on the electrode surface after nucleation 43,44 and successively experience the rapid growth mode (inertia-controlled growth) and the slow growth mode (diffusive growth). 6 The growth rate of bubbles is mainly determined by the formation rate of hydrogen molecules and the coalescence behavior between bubbles and is influenced by a series of parameters such as current density, electrocatalytic area, system temperature, and liquid−substrate contact angle.…”

Section: ■ Bubble Behaviormentioning

confidence: 99%

See 1 more Smart Citation

Bubble Management for Electrolytic Water Splitting by Surface Engineering: A Review

Cheng,

Du,

Ding

et al. 2023

Langmuir

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Section: Bubble Behaviormentioning

confidence: 99%

Section: ■ Bubble Behaviormentioning

confidence: 99%

Bubble Management for Electrolytic Water Splitting by Surface Engineering: A Review

Cheng,

Du,

Ding

et al. 2023

Langmuir

View full text Add to dashboard Cite

“…On the other hand, (ii) the transport of dissolved H 2 by diffusion and convection lower the local concentration of dissolved gas and hence reduce |E c |. Convective flows may arise from density-driven natural convection sustained by prominent concentration or thermal gradients in the vicinity of the electrode [66,67], as well as from solutal or thermal Marangoni convective flows (i.e., driven by gradients in the surface tension), which are strongest in the liquid wedge between the base of the bubble and the electrode [68][69][70][71][72][73][74][75]. Additionally, the growing bubble acts as a sink for the dissolved gas produced at the electrode surface which also lowers |E c |.…”

Section: Total Overpotentialmentioning

confidence: 99%

Potential response of single successive constant-current-driven electrolytic hydrogen bubbles spatially separated from the electrode

Raman

Peñas

Meer

et al. 2022

Preprint

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In gas-evolving electrolytic processes, the presence of bubbles can heavily alter the mass transport of gaseous products and can induce severe overpotential penalties at the electrode through the action of bubble coverage (hyperpolarization) and electrolyte constriction (Ohmic shielding). However, bubble formation can also alleviate the overpotential by lowering the concentration of dissolved gas in the vicinity of the electrode. In this study, we investigate the latter by considering the growth of successive hydrogen bubbles driven by a constant current in alkaline-water electrolysis and their impact on the half-cell potential in the absence of hyperpolarization. The bubbles nucleate on a hydrophobic cavity surrounded by a ring microelectrode which remains free of bubble coverage. The dynamics of bubble growth does not adhere to one particular scaling law in time, but undergoes a smooth transition from pressure-driven towards supply-limited growth. The contributions of the different bubble-induced phenomena leading to the rich behaviour of the periodic fluctuations of the overpotential are identified throughout the different stages of the bubble lifetime, and the influence of bubble size and applied current on the concentration and Ohmic overpotential components is quantified. We find that the efficiency of gas absorption, and hence the concentration-lowering effect, increases with increasing bubble size and also with increasing current. However, the concentration-lowering effect is always eventually countered and overcome by the effect of Ohmic shielding as the bubble size outgrows and eclipses the electrode ring beneath.

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“…Compared with the previous suggested parameterization, it no longer required the prior knowledge of bubble shape to monitor the bubble velocity, and it began to be used as a clear formula. Some researchers [14][15][16] analyzed the growth rule of bubbles, and verified that the bubble frequency and shape can be controlled by cross flow rate.…”

Section: Introductionmentioning

confidence: 99%

The movement and shape change characteristics of a bubble passing through a liquid-liquid interface

Zhang

Qing

et al. 2023

Therm sci

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In order to study the movement and shape change characteristic of bubble when passing through the interface of two kinds of liquids with different viscosity, the free rising process of a single bubble in static stratified liquids was numerically simulated with the volume of fluid (VOF) method. The results show that, when the initial height of bubble rising is the same, the rising velocity, deformation increase with the increase of bubble radius. When the maximum intensity of the vortex in the bubble is distributed at the top of the bubble, the top of the left and right sides and the bottom of the left and right sides, the bubble shape is spherical, ellipsoid and spherical cap shape respectively. At different initial heights, the bubble trajectory shows three different shapes -linear, spiral and C-shaped. The relationship between the bubble aspect ratio and rising height is predicted when different radius bubble passing through the interface. The amount of liquid B(lower layer) carried by the bubble increases with the increase of the bubble?s initial radius, and the amount of liquid carried by bubbles in C-shaped trajectory is higher than that in spiral trajectory.

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The effect of buoyancy driven convection on the growth and dissolution of bubbles on electrodes

Cited by 18 publications

References 56 publications

Bubble Management for Electrolytic Water Splitting by Surface Engineering: A Review

Bubble Management for Electrolytic Water Splitting by Surface Engineering: A Review

Potential response of single successive constant-current-driven electrolytic hydrogen bubbles spatially separated from the electrode

The movement and shape change characteristics of a bubble passing through a liquid-liquid interface

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