Water electrolysis in the presence of an ultrasonic field

Li, Sheng De; Wang, Cheng Chien; Chen, Chuh‐Yung

doi:10.1016/j.electacta.2009.01.087

Cited by 162 publications

(96 citation statements)

References 24 publications

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“…13 This external source technology induces acoustic waves, which oscillate the adhered gas bubbles on the electrode surface. The vibrating waves assist the attached bubble at the surface of the electrode to overcome the surface tension forces at gas-solid interphase and enhance the gas bubbles removal from the electrode surface.…”

Section: Bubbles Management By External Sourcesmentioning

confidence: 99%

“…Li, S. -D. et al, 2009 13 reported that applying USF in a water electrolysis reactor enhances the hydrogen production rate by 5–18% at certain current densities, because the sound waves will carry the hydrogen bubbles away from the cathode as soon as the hydrogen bubbles generate and before they are able to coalesce. However, the oxygen bubbles generation decreases by 8% at high electrolyte concentration under the presence of USF.…”

Section: Bubbles Management By External Sourcesmentioning

confidence: 99%

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Review—Physicochemical Hydrodynamics of Gas Bubbles in Two Phase Electrochemical Systems

Taqieddin

Nazari

Rajić

et al. 2017

J. Electrochem. Soc.

116

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Electrochemical systems suffer from poor management of evolving gas bubbles. Improved understanding of bubbles behavior helps to reduce overpotential, save energy and enhance the mass transfer during chemical reactions. This work investigates and reviews the gas bubbles hydrodynamics, behavior, and management in electrochemical cells. Although the rate of bubble growth over the electrode surface is well understood, there is no reliable prediction of bubbles break-off diameter from the electrode surface because of the complexity of bubbles motion near the electrode surface. Particle Image Velocimetry (PIV) and Laser Doppler Anemometry (LDA) are the most common experimental techniques to measure bubble dynamics. Although the PIV is faster than LDA, both techniques are considered expensive and time-consuming. This encourages adapting Computational Fluid Dynamics (CFD) methods as an alternative to study bubbles behavior. However, further development of CFD methods is required to include coalescence and break-up of bubbles for better understanding and accuracy. The disadvantages of CFD methods can be overcome by using hybrid methods. The behavior of bubbles in electrochemical systems is still a complex challenging topic which requires a better understanding of the gas bubbles hydrodynamics and their interactions with the electrode surface and bulk liquid, as well as between the bubbles itself.

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Section: Bubbles Management By External Sourcesmentioning

confidence: 99%

Section: Bubbles Management By External Sourcesmentioning

confidence: 99%

Review—Physicochemical Hydrodynamics of Gas Bubbles in Two Phase Electrochemical Systems

Taqieddin

Nazari

Rajić

et al. 2017

J. Electrochem. Soc.

116

View full text Add to dashboard Cite

show abstract

“…The disengagement of bubbles reduces the electrochemical cell voltage potential drop and it has a positive effect on the mass transfer similar to the super gravity technology. [130] reported that USF enhances the hydrogen production rate in water electrolysis reaction by 5-18% at certain current densities since the applied waves carry the hydrogen bubbles away from the cathode as soon as the hydrogen bubbles are generated. However, the oxygen bubbles generation decreases by 8% at high electrolyte concentration under the presence of USF since the bubbles coalescence will be hindered by the oscillation dynamics of the applied waves [130,167].…”

Section: Ultrasonic Fieldmentioning

confidence: 99%

“…Ultrasonic field (USF) is one of the promising applications to reduce gas bubbles accumulation on the electrode surface and the void fraction inside the bulk electrolyte [130].…”

Section: Ultrasonic Fieldmentioning

confidence: 99%

“…Several techniques have been developed to enhance the bubbles detachment from the electrode surface and to provide better mass transfer mixing either by applying external sources, such as magnetic, ultrasonic and super gravity fields, or by improving the components of the electrochemical cell such as the electrode geometry, distance between the electrodes or the cell orientation [4,127,[129][130][131][132][133][134][135]. In this chapter, we begin by presenting the physiochemical hydrodynamics of bubbles at electrode surface in section 2.1.…”

Section: Phase Electrochemical Systemsmentioning

confidence: 99%

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