Influences of a bipolar membrane and an ultrasonic field on alkaline water electrolysis

Hung, Chi Yuan; Li, Sheng De; Wang, Cheng Chien; Chen, Chuh Yung

doi:10.1016/j.memsci.2011.10.050

Cited by 41 publications

(16 citation statements)

References 26 publications

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“…However, the oxygen bubbles generation decreases by 8% at high electrolyte concentration under the presence of USF. 13, 78 Under normal conditions, oxygen bubbles grow and coalesce with neighboring bubbles. The buoyancy force can remove the bubbles from the surface of the electrode, once the bubble reaches a certain volume at which disengagement occurs at the interphase.…”

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

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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%

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

“…Therefore, fine bubbles are formed more easily under an ultrasonic field, with the periodic collapse of the cavitation bubbles, which can reduce bubble formation overpotential and Ohmic voltage. The effect of an ultrasonic field on hydrogen production with a polyvinylidene fluoride-grafted 2-methacrylic acid 3-(bis-carboxymethylamino)2-hydroxyl-propylester bipolar membrane (PVDF-g-G-1 BM) was shown to be improved in comparison to that without ultrasound [138]. A recent patent has described an apparatus and method to dissociate water into hydrogen and oxygen gases by electrolysis from the individual and balanced cumulative application of acoustic cavitation, a high-energy magnetic field and specific wavelength infrared energy [139].…”

Section: Ultrasonicsmentioning

confidence: 99%

Process intensification: An electrochemical perspective

Scott

2018

Renewable and Sustainable Energy Reviews

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This paper provides a review of a range of process intensification methods which have been applied to electrochemical processes and reactions. The electrochemical reactions include those in electrolysers where gas evolution occurs, in metal deposition reactions and reactions occurring in fuel cells and batteries. The process intensification methods include the use of centrifugal force fields, ultrasonics, rotating electrodes and rotating cells which operate with and without the application of magnetic fields. Such devices can be used in principle to carry out electrolysis without the application of an external potential or current. Other methods considered include the use of light. The area of magnetic field induced fluid flow is also discussed which has applications in lab on a chip technologies. The area of process intensification has largely focused a lot on hydrogen generation as a means of providing a clean, sustainable fuel.

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“…More recently, diaphragms called bipolar membranes (BM) have been developed. They consist of an interfacial layer separating an anion exchange layer, allowing the migration of HO − , and a cation exchange membrane, allowing the migration of H + (Hung et al , 2012 ). Globally, for hydrogen production from water electrolysis, the membrane has to be of low ohmic resistance, gastight, and mechanically and chemically stable.…”

Section: Alkaline Electrolysis Cell (Aec)mentioning

confidence: 99%