Advancements in Zinc-Air Redox Flow Batteries: Investigating the Role of Carbopol® Microgel Adsorption on Zinc microparticles

This research investigates zinc slurry-air redox flow batteries (Zn-air RFBs) as a means for energy storage, specifically addressing the challenge of zinc microparticle sedimentation in alkaline battery environments. The study explores the potential of yield stress fluids, particularly PAA (Carbopol...

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Bibliographic Details
Published in:Rheologica acta 2024-06, Vol.63 (8), p.645-656
Main Authors: Milián, Diego, Rharbi, Yahya, El Kissi, Nadia
Format: Article
Language:English
Subjects:
Engineering Sciences
Fluids mechanics
Mechanics
Online Access:Get full text
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Summary:This research investigates zinc slurry-air redox flow batteries (Zn-air RFBs) as a means for energy storage, specifically addressing the challenge of zinc microparticle sedimentation in alkaline battery environments. The study explores the potential of yield stress fluids, particularly PAA (Carbopol ® ) microgels, as stabilizers for zinc particles during battery operation, and regarding sedimentation in particular. Two effects that can limit the effectiveness of PAA yield stress in stabilizing the suspension are examined in this study. First is the ionic strength and pH that can evolve during the slurry formulation. The second effect is associated to zinc polymer interactions that can develop during the suspension preparation.Using methodologies such as reverse rheology and UV-Vis spectroscopy, the research identifies that the primary stabilization challenge is the adsorption of Carbopol ® microgels onto zinc surfaces, which significantly influences the gel's yield stress. These insights contribute to an enhanced understanding of the physical chemistry of the suspending fluid, facilitating the development of more efficient and stable Zn-Air RFBs.
ISSN:0035-4511
1435-1528
DOI:10.1007/s00397-024-01464-w