Morphology control of zinc regeneration for zinc–air fuel cell and battery

Wang, Keliang; Pei, Pucheng; Ma, Ze; Xu, Huachi; Li, Pengcheng; Wang, Xizhong

doi:10.1016/j.jpowsour.2014.07.182

Cited by 113 publications

(90 citation statements)

References 28 publications

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“…Hence, bath/metal interface is affected by gas bubbles. Concerning zincair fuel cells, the performance is determined by active surface area, of which morphological modifications during charge and discharge are impacted by convection, among other mechanisms [3]. Furthermore in the energy field, Zeng and Zhang [4] showed that the additional resistance arising from partial coverage of the electrodes by the bubbles was critical in alkaline water electrolysis efficiency.…”

Section: Introductionmentioning

confidence: 99%

Modeling of electrochemically generated bubbly flow under buoyancy-driven and forced convection

Schillings

Doche

Deseure

2015

International Journal of Heat and Mass Transfer

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a b s t r a c tThis work is devoted to the modeling of two phase flows arising in typical electrolysis devices. A numerical mixture model is used in order to resolve the two dimensional bubble plumes evolving along the electrodes. Plumes thickness sensitivity is studied for various parameters, such as bubble diameter, electrolyte viscosity, electrochemical cell geometry and current density. Using thermal buoyancy driven flow analogy, a dimensionless Rayleigh-like number Ra f ;e is defined to predict the behavior of the wallbounded gas convection between two vertical facing electrodes. Different bubbles dispersion mechanisms are observed depending on two-phase flow dynamics and physical properties of the mixture. The effect of forced convection in the channel is also investigated. A scaling law for plume thickness evolution for a large range of Prandtl-equivalent number values is proposed. These results show that the bubble plume can be efficiently controlled by an imposed electrolyte velocity.

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Section: Introductionmentioning

confidence: 99%

Modeling of electrochemically generated bubbly flow under buoyancy-driven and forced convection

Schillings

Doche

Deseure

2015

International Journal of Heat and Mass Transfer

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“…Thaller's redox flow battery was comprised of iron and chromium [1]. Since that time, the design of the redox flow battery systems has evolved as witnessed by review of the numerous papers that have been published over the last four decades [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. And yet, this field is still in its infancy due to the lack of suitable electrode and electrolyte materials, together with difficulties in mastering the interfaces between them.…”

mentioning

confidence: 99%

Effects of Electrolyte Concentration, Temperature, Flow Velocity and Current Density on Zn Deposit Morphology

Gavrilović-Wohlmuther¹,

Laskos²,

Zelger³

et al. 2015

JEPE

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Abstract:The most critical disadvantages of the Zn-air flow battery system are corrosion of the zinc, which appears as a high self-discharge current density and a short cycle life due to the non-uniform, dendritic, zinc electrodeposition that can lead to internal short-circuit. In our efforts to find a dendrite-free Zn electrodeposition which can be utilized in the Zn-air flow battery, the surface morphology of the electrolytic Zn deposits on a polished polymer carbon composite anode in alkaline, additive-free solutions was studied. Experiments were carried out with 0.1 M, 0.2 M and 0.5 M zincate concentrations in 8 M KOH. The effects of different working conditions such as: elevated temperatures, different current densities and different flow velocities, on current efficiency and dendrite formation were investigated. Specially designed test flow-cell with a central transparent window was employed. The highest Coulombic efficiencies of 80%-93% were found for 0.5 M ZnO in 8 M KOH, at increased temperatures (50-70 °C), current densities of up to 100 mA·cm -2 and linear electrolyte flow velocities higher than 6.7 cm·s -1 .

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“…The uniform morphology of deposited zinc can be attained via the manipulations of low current, pulsating current or hydrodynamic electrolyte. To achieve a granular morphology, an electrode with discrete columnar structure, in conjunction with high current and electrolyte flowing, has to be applied [145].…”

Section: Latest Progress In Zinc Regenerationmentioning

confidence: 99%

Zinc regeneration in rechargeable zinc-air fuel cells—A review

Zhu

Wilkinson

Zhang

et al. 2016

Journal of Energy Storage

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Zinc-air fuel cells (ZAFCs) present a promising energy source with a competing potential with the lithium-ion battery and even with proton-exchange membrane fuel cells (PEMFCs) for applications in next generation electrified transport and energy storage. The regeneration of zinc is essential for developing the next-generation, i.e., electrochemically rechargeable ZAFCs. This review aims to provide a comprehensive view on both theoretical and industrial platforms already built hitherto, with focus on electrode materials, electrode and electrolyte additives, solution chemistry, zinc deposition reaction mechanisms and kinetics, and electrochemical zinc regeneration systems. The related technological challenges and their possible solutions are described and discussed.A summary of important R&D patents published within the recent 10 years is also presented. * Corresponding authors. Email: xinge.zhang@ nrc-cnrc.gc.ca (X. Zhang); skulinich@tokai-u.jp (S.A. Kulinich)

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Morphology control of zinc regeneration for zinc–air fuel cell and battery

Cited by 113 publications

References 28 publications

Modeling of electrochemically generated bubbly flow under buoyancy-driven and forced convection

Modeling of electrochemically generated bubbly flow under buoyancy-driven and forced convection

Effects of Electrolyte Concentration, Temperature, Flow Velocity and Current Density on Zn Deposit Morphology

Zinc regeneration in rechargeable zinc-air fuel cells—A review

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