“SPEEK-COF” Composite Cation Exchange Membrane for Zn-I2 Redox Flow Battery

Bavdane, Priyanka P.; Chola, Noufal Merukan

doi:10.1149/1945-7111/ac99a3

Cited by 12 publications

(9 citation statements)

References 56 publications

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“…Thus, the lower concentrations and shorter charge/discharge times were used to properly evaluate the membrane characteristics in this system, without the need to account for any experimental artifacts caused by the issues described above. Therefore, the capacity values achieved in this work were much lower than reported elsewhere [ 62,63,70 ] but allowed for optimal comparisons between the membranes that were tested.…”

Section: Methodsmentioning

confidence: 87%

Proton Exchange Membranes from Sulfonated Lignin Nanocomposites for Redox Flow Battery Applications

dos Santos,

McMichael,

Whitbeck

et al. 2024

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Redox flow batteries (RFBs) are increasingly being considered for a wide range of energy storage applications, and such devices rely on proton exchange membranes (PEMs) to function. PEMs are high‐cost, petroleum‐derived polymers that often possess limited durability, variable electrochemical performance, and are linked to discharge of perfluorinated compounds. Alternative PEMs that utilize biobased materials, including lignin and sulfonated lignin (SL), low‐cost byproducts of the wood pulping process, have struggled to balance electrochemical performance with dimensional stability. Herein, SL nanoparticles are demonstrated for use as a nature‐derived, ion‐conducting PEM material. SL nanoparticles (NanoSLs) can be synthesized for increased surface area, uniformity, and miscibility compared with macrosized lignin, improving proton conductivity. After addition of polyvinyl alcohol (PVOH) as a structural backbone, membranes with the highest NanoSL concentration demonstrated an ion exchange capacity of 1.26 meq g−1, above that of the commercial PEM Nafion 112 (0.98 meq g−1), along with a conductivity of 80.4 mS cm−1 in situ, above that of many biocomposite PEMs, and a coulombic efficiency (CE), energy efficiency (EE) and voltage efficiency (VE) of 91%, 68% and 78%, respectively at 20 mA cm−2. These nanocomposite PEMs demonstrate the potential for valorization of forest biomass waste streams for high value clean energy applications.

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Section: Methodsmentioning

confidence: 87%

Proton Exchange Membranes from Sulfonated Lignin Nanocomposites for Redox Flow Battery Applications

dos Santos,

McMichael,

Whitbeck

et al. 2024

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“…The conduction of ions is thought to be by Grotthuss and vehicular mechanisms. 35 The Grotthuss mechanism was thought to be in SPEEK matrix whereas vehicular mechanisms was through to be in SHCP, the hyper cross linked crown ether matrix. Membrane effect in Zinc-Iodine flow battery performance.-The flow battery was assembled with 1 M ZnBr 2 as negative and 2 M KI as a positive electrolyte in 2 M KCl supporting electrolyte.…”

Section: Resultsmentioning

confidence: 99%

“…Physiochemical properties.-Water uptake, swelling ratio, ion exchange capacity and degree of sulphonation.-The water uptake was measured as reported earlier. 35 A membrane piece of 5 × 5 cm 2 was stored in a vacuum oven at 60 °C for 24 h, and weighed to get dry weight of the membrane. The membrane was then immersed in DI water for 24 h, taken out and gently wiped to remove the excess water adhered to the membrane surface, and weighed to get the wet weight of the membrane.…”

Section: Sulfonation Of Hypercrosslinked Polymer (Shcp)mentioning

confidence: 99%

Aqueous Zinc Ion Battery with Potassium Selective Hyper Cross-Linked Dibenzo-18-Crown-6-Ether Membrane

Bavdane,

Bhatt,

Nikumbe

et al. 2023

J. Electrochem. Soc.

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Nonselective ion transport across the separator in zinc-iodine flow batteries (ZIFBs) alters concentration gradients, precipitates insoluble iodine, and generates uneven zinc nucleation on the anode surface. Here, we report the synthesis of a K+ ion-selective hyper-cross-linked dibenzo-18-crown-6-ether-containing polymer (HCP) that allows transfer of the K+ ion while avoiding the crossover of electroactive species. The sulfonated HCP was blended with SPEEK in compositions of 5, 10, and 15 %, designated as SHCP1, SHCP2, and SHCP3, respectively. The blending of SHCP results in increases in ion exchange capacity (IEC), water uptake, ionic conductivity, and K+ ion selectivity. The best membrane, SHCP3, showed 7.6 times higher K+ ion selectivity than the neat SPEEK membrane. The galvanostatic charging/discharging over 200 cycles at 20 mA cm-2 current density showed 96 % CE, 88% VE, and 84 % EE for the SHCP3 membrane. It delivered 37.5 Ah L-1 capacity at 20 mA cm-2 current density, whereas Nafion-117 delivered 22 Ah L-1 capacity. The OCV of the cell with SHCP3 membranes remains at 1 V over 20 h. The results suggest that K+ ion selectivity is significantly helping in mitigating dendrite formation and enhancing the stability of the ZIFB battery, thus increasing its potential use.

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“…However, these batteries have harmful side effects, including shuttle effects, anode corrosion, and dendrite problems. To solve these problems, Noufal et al [137] experimented with a new material Reproduced with permission. [137] Copyright 2022, Electrochemical Society.…”

Section: Application Of Cof-correlated Materials In Szibsmentioning

confidence: 99%

Engineering Covalent Organic Frameworks Toward Advanced Zinc‐Based Batteries

Zhang,

Zhi,

Zhang

et al. 2024

Advanced Materials

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Zinc–based batteries (ZBBs) have demonstrated considerable potential among secondary batteries, attributing to their advantages including good safety, environmental friendliness, and high energy density. However, ZBBs still suffer from issues such as the formation of zinc dendrites, occurrence of side reactions, retardation of reaction kinetics, and shuttle effects, posing a great challenge for practical applications. As promising porous materials, covalent organic frameworks (COFs) and their derivatives have rigid skeletons, ordered structures, and permanent porosity, which endow them with great potential for application in ZBBs. This review, therefore, provides a systematic overview detailing on COFs structure pertaining to electrochemical performance of ZBBs, following an in–depth discussion of the challenges faced by ZBBs, which includes dendrites and side reactions at the anode, as well as dissolution, structural change, slow kinetics and shuttle effect at the cathode. Then, the structural advantages of COF–correlated materials and their roles in various ZBBs are highlighted. Finally, the challenges in the application of COF–correlated materials in ZBBs are outlined and an outlook on the future development of COF–correlated materials for using in ZBBs is provided. The review would serve as a valuable reference for further research into the utilization of COF–correlated materials in ZBBs.This article is protected by copyright. All rights reserved

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“SPEEK-COF” Composite Cation Exchange Membrane for Zn-I2 Redox Flow Battery

Cited by 12 publications

References 56 publications

Proton Exchange Membranes from Sulfonated Lignin Nanocomposites for Redox Flow Battery Applications

Proton Exchange Membranes from Sulfonated Lignin Nanocomposites for Redox Flow Battery Applications

Aqueous Zinc Ion Battery with Potassium Selective Hyper Cross-Linked Dibenzo-18-Crown-6-Ether Membrane

Engineering Covalent Organic Frameworks Toward Advanced Zinc‐Based Batteries

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